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, 2021
Dec. 31, 2020
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash $ 82,299 $ 251,047
Loans 4,655,326 4,715,230
Total pledged assets 6,175,337 6,174,596
Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 964,484 763,236
Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 473,228 445,083
Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 1,175,732 906,313
Public deposits | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 703,489 469,864
Public deposits | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 472,243 436,449
Repurchase agreements    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 130,217 116,876
Repurchase agreements | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 130,217 116,876
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 4,263,259 4,374,383
Total pledged assets 4,306,981 4,426,706
FHLB advances | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 43,722 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 82,299 251,047
Loans 0 0
Total pledged assets 147,352 251,832
Derivatives | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 65,053 785
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 392,067 340,847
Total pledged assets 392,067 340,847
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 22,988 132,022
Other purposes | Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 22,003 123,388
Other purposes | Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged $ 985 $ 8,634