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FAIR VALUE MEASURES - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financial assets:    
Cash and due from banks $ 216,927 $ 244,980
Interest-bearing deposits in banks 826,237 975,397
Debt securities held-to-maturity 187,612 144,028
Financial liabilities:    
Other borrowings 337,094 291,788
Subordinated deferrable interest debentures 133,804 132,309
Carrying Amount    
Financial assets:    
Cash and due from banks 216,927 244,980
Interest-bearing deposits in banks 826,237 975,397
Debt securities held-to-maturity 202,581 164,677
Loans, net 20,882,011 20,356,125
Financial liabilities:    
Deposits 22,228,078 21,722,448
Other borrowings 337,094 291,788
Subordinated deferrable interest debentures 133,804 132,309
Fair Value    
Financial assets:    
Cash and due from banks 216,927 244,980
Interest-bearing deposits in banks 826,237 975,397
Debt securities held-to-maturity 187,612 144,028
Loans, net 20,585,880 19,882,553
Financial liabilities:    
Deposits 22,225,008 21,721,421
Other borrowings 335,978 291,213
Subordinated deferrable interest debentures 142,010 142,202
Fair Value | Level 1    
Financial assets:    
Cash and due from banks 216,927 244,980
Interest-bearing deposits in banks 826,237 975,397
Debt securities held-to-maturity 0 0
Loans, net 0 0
Financial liabilities:    
Deposits 0 0
Other borrowings 0 0
Subordinated deferrable interest debentures 0 0
Fair Value | Level 2    
Financial assets:    
Cash and due from banks 0 0
Interest-bearing deposits in banks 0 0
Debt securities held-to-maturity 187,612 144,028
Loans, net 0 0
Financial liabilities:    
Deposits 22,225,008 21,721,421
Other borrowings 335,978 291,213
Subordinated deferrable interest debentures 142,010 142,202
Fair Value | Level 3    
Financial assets:    
Cash and due from banks 0 0
Interest-bearing deposits in banks 0 0
Debt securities held-to-maturity 0 0
Loans, net 20,585,880 19,882,553
Financial liabilities:    
Deposits 0 0
Other borrowings 0 0
Subordinated deferrable interest debentures $ 0 $ 0