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
Jun. 30, 2021
Dec. 31, 2020
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash $ 73,274 $ 251,047
Loans 4,741,975 4,715,230
Total pledged assets 6,037,360 6,174,596
Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 790,857 763,236
Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 431,254 445,083
Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 936,754 906,313
Public deposits | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 506,490 469,864
Public deposits | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 430,264 436,449
Repurchase agreements    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 146,847 116,876
Repurchase agreements | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 146,847 116,876
Repurchase agreements | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0 0
FHLB Advances    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 4,389,787 4,374,383
Total pledged assets 4,438,307 4,426,706
FHLB Advances | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 48,520 52,323
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 73,274 251,047
Loans 0 0
Total pledged assets 139,252 251,832
Derivatives | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 65,978 785
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 352,188 340,847
Total pledged assets 352,188 340,847
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
Other purposes    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 24,012 132,022
Other purposes | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 23,022 123,388
Other purposes | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged $ 990 $ 8,634