v3.25.3
FAIR VALUE DISCLOSURES - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Financial assets      
Investment securities held-to-maturity   $ 71,595 $ 76,960
Other investments (1)   117,120 114,598
Interest Receivable   52,193 53,200
Deposits      
Noninterest-bearing   3,127,512 3,132,381
Savings   5,029,097 4,948,768
Time   3,293,707 3,152,265
Federal Home Loan Bank Stock and Federal Reserve Bank Stock   $ 104,400 103,000
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 11.52% 11.63%  
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 5.96% 6.29%  
Impaired Commercial And Commercial Real Estate Loans Member      
Deposits      
Principal Amount of Commercial and Commercial Real Estate Loans   $ 23,900 3,900
Allowance for Loan and Lease Losses, Real Estate   10,100 2,100
Carrying value      
Financial assets      
Cash and interest-bearing deposits with other banks   739,739 904,486
Investment securities held-to-maturity   71,595 76,960
Other investments (1)   12,739 11,570
Loans and leases   11,552,635 11,604,987
Interest Receivable   66,865 67,420
Deposits      
Deposits   14,433,448 14,329,138
Short-term borrowings   595,167 755,452
Long-term debt   221,823 347,509
Interest Payable   35,301 43,411
Fair value      
Financial assets      
Cash and interest-bearing deposits with other banks   739,739 904,486
Investment securities held-to-maturity   65,911 68,989
Other investments (1)   12,739 11,570
Loans and leases   11,444,671 11,417,941
Interest Receivable   66,865 67,420
Deposits      
Deposits   14,427,984 14,322,815
Short-term borrowings   595,167 755,452
Long-term debt   227,368 346,613
Interest Payable   35,301 43,411
Fair Value, Inputs, Level 1 [Member] | Fair value      
Financial assets      
Cash and interest-bearing deposits with other banks   739,739 904,486
Investment securities held-to-maturity   0 0
Other investments (1)   1,691 1,530
Loans and leases   0 0
Interest Receivable   0 0
Deposits      
Deposits   0 0
Short-term borrowings   595,167 755,452
Long-term debt   0 0
Interest Payable   4,750 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   65,911 68,989
Other investments (1)   40 40
Loans and leases   0 0
Interest Receivable   14,672 14,263
Deposits      
Deposits   14,427,984 14,322,815
Short-term borrowings   0 0
Long-term debt   227,368 346,613
Interest Payable   30,551 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)   11,008 10,000
Loans and leases   11,444,671 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