Quarterly report pursuant to Section 13 or 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
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current $ 6,046,978 $ 5,542,840  
Total Loans 6,148,918 5,671,462 $ 5,543,621
Construction and Land Development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 769,308 737,958  
Total Loans 776,430 749,720 694,645
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 834,389 826,859  
Total Loans 857,142 860,086 863,578
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 1,436,363 1,255,367  
Total Loans 1,454,828 1,270,480 1,223,607
Multifamily Real Estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 337,234 320,701  
Total Loans 339,313 322,528 329,959
Commercial & Industrial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 506,673 431,916  
Total Loans 509,857 435,365 409,657
Residential 1-4 Family      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 963,919 928,312  
Total Loans 999,361 978,469 987,788
HELOC      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 517,229 509,124  
Total Loans 524,097 516,726 514,362
Consumer and all other      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 429,019 301,339  
Total Loans 432,702 304,027 294,031
Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 55,780 64,455  
Total Loans 62,346 73,737 78,606
Purchased Impaired | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 4,540 5,025  
Purchased Impaired | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 2,026 4,257  
Purchased Impaired | Construction and Land Development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 3,176 5,376  
Total Loans 3,205 5,986 7,628
Purchased Impaired | Construction and Land Development | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 29 369  
Purchased Impaired | Construction and Land Development | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 241  
Purchased Impaired | Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 17,693 24,837  
Total Loans 19,064 27,388 28,694
Purchased Impaired | Commercial Real Estate - Owner Occupied | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 737 1,139  
Purchased Impaired | Commercial Real Estate - Owner Occupied | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 634 1,412  
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 16,095 12,562  
Total Loans 18,141 13,519 13,326
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,921 755  
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 125 202  
Purchased Impaired | Multifamily Real Estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 2,079 1,555  
Total Loans 2,079 1,555 1,943
Purchased Impaired | Multifamily Real Estate | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 0  
Purchased Impaired | Multifamily Real Estate | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 0  
Purchased Impaired | Commercial & Industrial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 1,043 1,583  
Total Loans 1,145 1,813 2,245
Purchased Impaired | Commercial & Industrial | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 45 209  
Purchased Impaired | Commercial & Industrial | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 57 21  
Purchased Impaired | Residential 1-4 Family      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 14,367 17,093  
Total Loans 16,828 21,159 22,379
Purchased Impaired | Residential 1-4 Family | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,686 2,143  
Purchased Impaired | Residential 1-4 Family | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 775 1,923  
Purchased Impaired | HELOC      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 941 923  
Total Loans 1,498 1,791 1,812
Purchased Impaired | HELOC | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 122 410  
Purchased Impaired | HELOC | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 435 458  
Purchased Impaired | Consumer and all other      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 386 526  
Total Loans 386 526 $ 579
Purchased Impaired | Consumer and all other | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 0  
Purchased Impaired | Consumer and all other | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due $ 0 $ 0