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FAIR VALUES OF FINANCIAL INSTRUMENTS - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Assets:    
Cash and due from banks $ 100,514 $ 112,649
Interest-bearing deposits 410,497 436,080
Investment securities available for sale 1,620,213 1,627,112
Investment securities held to maturity, net 1,820,451 1,870,374
Loans held for sale 15,118 18,934
Loans, net 11,965,258 11,958,301
Federal Home Loan Bank stock 41,758 41,769
Derivative assets 89,743 79,379
Interest receivable 92,550 97,664
Liabilities:    
Deposits 14,872,725 14,811,957
Borrowings:    
Securities sold under repurchase agreements 130,254 157,265
Federal Home Loan Bank advances 602,913 707,377
Subordinated debentures and other borrowings 109,654 149,995
Derivative liabilities 89,437 79,008
Interest payable 19,262 18,912
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Cash and due from banks 100,514 112,649
Interest-bearing deposits 410,497 436,080
Investment securities available for sale 0 0
Investment securities held to maturity, net 0 0
Loans held for sale 0 0
Loans, net 0 0
Federal Home Loan Bank stock 0 0
Derivative assets 0 0
Interest receivable 0 0
Liabilities:    
Deposits 12,451,569 12,482,295
Borrowings:    
Securities sold under repurchase agreements 0 0
Federal Home Loan Bank advances 0 0
Subordinated debentures and other borrowings 0 0
Derivative liabilities 0 0
Interest payable 0 0
Significant Other Observable Inputs (Level 2)    
Assets:    
Cash and due from banks 0 0
Interest-bearing deposits 0 0
Investment securities available for sale 1,616,966 1,623,802
Investment securities held to maturity, net 1,810,678 1,859,974
Loans held for sale 15,118 18,934
Loans, net 0 0
Federal Home Loan Bank stock 41,758 41,769
Derivative assets 89,743 79,379
Interest receivable 92,550 97,664
Liabilities:    
Deposits 2,421,156 2,329,662
Borrowings:    
Securities sold under repurchase agreements 130,254 157,265
Federal Home Loan Bank advances 602,913 707,377
Subordinated debentures and other borrowings 109,654 149,995
Derivative liabilities 89,437 79,008
Interest payable 19,262 18,912
Significant Unobservable Inputs (Level 3)    
Assets:    
Cash and due from banks 0 0
Interest-bearing deposits 0 0
Investment securities available for sale 3,247 3,310
Investment securities held to maturity, net 9,773 10,400
Loans held for sale 0 0
Loans, net 11,965,258 11,958,301
Federal Home Loan Bank stock 0 0
Derivative assets 0 0
Interest receivable 0 0
Liabilities:    
Deposits 0 0
Borrowings:    
Securities sold under repurchase agreements 0 0
Federal Home Loan Bank advances 0 0
Subordinated debentures and other borrowings 0 0
Derivative liabilities 0 0
Interest payable 0 0
Carrying Amount    
Assets:    
Cash and due from banks 100,514 112,649
Interest-bearing deposits 410,497 436,080
Investment securities available for sale 1,620,213 1,627,112
Investment securities held to maturity, net 2,163,361 2,184,252
Loans held for sale 15,118 18,934
Loans, net 12,260,901 12,281,093
Federal Home Loan Bank stock 41,758 41,769
Derivative assets 89,743 79,379
Interest receivable 92,550 97,664
Liabilities:    
Deposits 14,884,584 14,821,453
Borrowings:    
Securities sold under repurchase agreements 130,264 157,280
Federal Home Loan Bank advances 612,778 712,852
Subordinated debentures and other borrowings 118,612 158,644
Derivative liabilities 89,437 79,008
Interest payable $ 19,262 $ 18,912