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
Mar. 31, 2022
Dec. 31, 2021
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash $ 147,411 $ 82,299
Loans 3,391,402 4,655,326
Total pledged assets 4,924,023 6,175,337
Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 856,883 964,484
Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 528,327 473,228
Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 1,146,843 1,175,732
Public deposits | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 619,431 703,489
Public deposits | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 527,412 472,243
Repurchase agreements    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 116,260 130,217
Repurchase agreements | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 116,260 130,217
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 2,966,527 4,263,259
Total pledged assets 3,007,446 4,306,981
FHLB advances | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 40,919 43,722
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 147,411 82,299
Loans 0 0
Total pledged assets 208,666 147,352
Derivatives | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 61,255 65,053
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 424,875 392,067
Total pledged assets 424,875 392,067
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 19,933 22,988
Other purposes | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 19,018 22,003
Other purposes | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged $ 915 $ 985