Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENCIES (Schedule of Securities Pledged as Collateral) (Details)

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COMMITMENTS AND CONTINGENCIES (Schedule of Securities Pledged as Collateral) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash $ 276,786 $ 116,839
Loans 4,860,569 4,139,672
Total pledged assets 6,346,607 5,300,858
Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 767,599 733,995
Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 441,653 310,352
Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 908,958 759,362
Public deposits | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 476,167 467,266
Public deposits | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 432,791 292,096
Repurchase agreements    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 111,781 86,901
Repurchase agreements | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 111,781 79,299
Repurchase agreements | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0 7,602
FHLB Advances    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 4,354,063 3,846,934
Total pledged assets 4,408,258 3,910,746
FHLB Advances | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 54,195 63,812
FHLB Advances | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0 0
Fed Funds    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 316,561 292,738
Total pledged assets 316,561 292,738
Fed Funds | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0 0
Fed Funds | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0 0
Derivatives    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 276,786 116,839
Loans 0 0
Total pledged assets 277,725 118,099
Derivatives | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 939 1,260
Derivatives | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0 0
Other purposes    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 133,379 133,012
Other purposes | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 124,517 122,358
Other purposes | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 8,862 $ 10,654
PPPLF Advances    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0  
Loans 189,945  
Total pledged assets 189,945  
PPPLF Advances | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0  
PPPLF Advances | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged $ 0