Annual report pursuant to Section 13 and 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (PCI Loan Portfolios by Segment and Delinquency Status) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (PCI Loan Portfolios by Segment and Delinquency Status) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 12,419,378 $ 9,537,156
Total Loans 12,610,936 9,716,207
Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 70,267 71,213
Total Loans 86,681 90,221
Construction and Land Development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,231,043 1,177,204
Total Loans 1,250,924 1,194,821
Construction and Land Development | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 10,465 7,122
Total Loans 10,944 8,654
Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 2,001,074 1,294,975
Total Loans 2,041,243 1,337,345
Commercial Real Estate - Owner Occupied | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 20,074 20,705
Total Loans 27,438 25,644
Commercial Real Estate - Non-Owner Occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 3,269,244 2,447,907
Total Loans 3,286,098 2,467,410
Commercial Real Estate - Non-Owner Occupied | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 12,730 15,464
Total Loans 14,565 17,335
Multifamily Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 632,952 547,997
Total Loans 633,743 548,231
Multifamily Real Estate | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 94 88
Total Loans 94 88
Commercial and Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 2,099,974 1,309,581
Total Loans 2,114,033 1,317,135
Commercial and Industrial | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 590 1,017
Total Loans 1,579 2,156
Residential 1-4 Family - Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 703,471 614,732
Total Loans 724,337 640,419
Residential 1-4 Family - Commercial | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 9,667 9,276
Total Loans 12,205 13,601
Residential 1-4 Family - Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 842,667 630,132
Total Loans 890,503 673,909
Residential 1-4 Family - Consumer | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 12,005 12,491
Total Loans 14,713 16,872
Residential 1-4 Family - Revolving    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 637,966 600,055
Total Loans 659,504 613,383
Residential 1-4 Family - Revolving | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 3,635 4,365
Total Loans 4,127 5,115
Auto    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 346,819 297,442
Total Loans 350,419 301,943
Auto | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 4 7
Total Loans 4 7
Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 367,794 376,057
Total Loans 372,853 379,694
Consumer | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 659 18
Total Loans 668 32
Other Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 286,374 241,074
Total Loans 287,279 241,917
Other Commercial | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 344 660
Total Loans 344 717
30 To 89 Days Past Due | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 3,221 4,264
30 To 89 Days Past Due | Construction and Land Development | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 136 108
30 To 89 Days Past Due | Commercial Real Estate - Owner Occupied | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 480 658
30 To 89 Days Past Due | Commercial Real Estate - Non-Owner Occupied | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 848 61
30 To 89 Days Past Due | Multifamily Real Estate | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
30 To 89 Days Past Due | Commercial and Industrial | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 47
30 To 89 Days Past Due | Residential 1-4 Family - Commercial | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 543 871
30 To 89 Days Past Due | Residential 1-4 Family - Consumer | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 927 1,959
30 To 89 Days Past Due | Residential 1-4 Family - Revolving | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 287 498
30 To 89 Days Past Due | Auto | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
30 To 89 Days Past Due | Consumer | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 5
30 To 89 Days Past Due | Other Commercial | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 57
Greater Than 90 Days | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 13,193 14,744
Greater Than 90 Days | Construction and Land Development | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 343 1,424
Greater Than 90 Days | Commercial Real Estate - Owner Occupied | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 6,884 4,281
Greater Than 90 Days | Commercial Real Estate - Non-Owner Occupied | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 987 1,810
Greater Than 90 Days | Multifamily Real Estate | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Greater Than 90 Days | Commercial and Industrial | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 989 1,092
Greater Than 90 Days | Residential 1-4 Family - Commercial | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 1,995 3,454
Greater Than 90 Days | Residential 1-4 Family - Consumer | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 1,781 2,422
Greater Than 90 Days | Residential 1-4 Family - Revolving | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 205 252
Greater Than 90 Days | Auto | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Greater Than 90 Days | Consumer | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 9 9
Greater Than 90 Days | Other Commercial | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due $ 0 $ 0