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FAIR VALUE DISCLOSURES - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Dec. 31, 2024
Financial assets      
Investment securities held-to-maturity $ 76,469   $ 76,960
Other investments (1) 120,826   114,598
Interest Receivable 53,367   53,200
Deposits      
Noninterest-bearing 3,161,302   3,132,381
Savings 4,886,613   4,948,768
Time 3,144,440   3,152,265
Federal Home Loan Bank Stock and Federal Reserve Bank Stock $ 108,300   103,000
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 11.50% 11.52%  
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 6.31% 5.96%  
Impaired Commercial And Commercial Real Estate Loans Member      
Deposits      
Principal Amount of Commercial and Commercial Real Estate Loans $ 10,300   3,900
Allowance for Loan and Lease Losses, Real Estate 3,600   2,100
Carrying value      
Financial assets      
Cash and interest-bearing deposits with other banks 823,959   904,486
Investment securities held-to-maturity 76,469   76,960
Other investments (1) 12,534   11,570
Loans and leases 11,568,648   11,604,987
Interest Receivable 67,983   67,420
Deposits      
Deposits 14,196,956   14,329,138
Short-term borrowings 799,792   755,452
Long-term debt 345,878   347,509
Interest Payable 44,921   43,411
Fair value      
Financial assets      
Cash and interest-bearing deposits with other banks 823,959   904,486
Investment securities held-to-maturity 69,358   68,989
Other investments (1) 12,534   11,570
Loans and leases 11,378,316   11,417,941
Interest Receivable 67,983   67,420
Deposits      
Deposits 14,188,908   14,322,815
Short-term borrowings 799,792   755,452
Long-term debt 347,338   346,613
Interest Payable 44,921   43,411
Fair Value, Inputs, Level 1 [Member] | Fair value      
Financial assets      
Cash and interest-bearing deposits with other banks 823,959   904,486
Investment securities held-to-maturity 0   0
Other investments (1) 1,494   1,530
Loans and leases 0   0
Interest Receivable 0   0
Deposits      
Deposits 0   0
Short-term borrowings 799,792   755,452
Long-term debt 0   0
Interest Payable 7,403   4,663
Fair Value, Inputs, Level 2 [Member] | Fair value      
Financial assets      
Cash and interest-bearing deposits with other banks 0   0
Investment securities held-to-maturity 69,358   68,989
Other investments (1) 40   40
Loans and leases 0   0
Interest Receivable 14,616   14,263
Deposits      
Deposits 14,188,908   14,322,815
Short-term borrowings 0   0
Long-term debt 347,338   346,613
Interest Payable 37,518   38,748
Fair Value, Inputs, Level 3 [Member] | Fair value      
Financial assets      
Cash and interest-bearing deposits with other banks 0   0
Investment securities held-to-maturity 0   0
Other investments (1) 11,000   10,000
Loans and leases 11,378,316   11,417,941
Interest Receivable     53,157
Deposits      
Deposits 0   0
Short-term borrowings 0   0
Long-term debt 0   0
Interest Payable $ 0   $ 0