Annual report pursuant to Section 13 and 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
Dec. 31, 2020
Dec. 31, 2019
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash $ 251,047 $ 116,839
Loans 4,715,230 4,139,672
Total pledged assets 6,174,596 5,300,858
Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 763,236 733,995
Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 445,083 310,352
Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 906,313 759,362
Public deposits | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 469,864 467,266
Public deposits | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 436,449 292,096
Repurchase agreements    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 116,876 86,901
Repurchase agreements | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 116,876 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 4,374,383 3,846,934
Total pledged assets 4,426,706 3,910,746
FHLB Advances | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 52,323 63,812
FHLB Advances | 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 251,047 116,839
Loans 0 0
Total pledged assets 251,832 118,099
Derivatives | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 785 1,260
Derivatives | 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 340,847 292,738
Total pledged assets 340,847 292,738
Fed Funds | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0  
Fed Funds | 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 132,022 133,012
Other purposes | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 123,388 122,358
Other purposes | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged $ 8,634 $ 10,654