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FAIR VALUE DISCLOSURES - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Financial assets    
Investment securities held-to-maturity $ 78,921 $ 80,321
Other investments (1) 132,412 129,945
Interest Receivable 59,367 56,900
Deposits    
Noninterest-bearing 3,061,427 3,317,960
Savings 4,628,320 4,331,228
Time 3,049,635 2,718,390
Federal Home Loan Bank Stock and Federal Reserve Bank Stock $ 121,200 $ 109,400
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 11.52% 11.50%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 6.01% 5.92%
Impaired Commercial And Commercial Real Estate Loans Member    
Deposits    
Principal Amount of Commercial and Commercial Real Estate Loans $ 26,000 $ 19,700
Allowance for Loan and Lease Losses, Real Estate 7,300 4,400
Carrying value    
Financial assets    
Cash and short-term investments 932,349 1,006,019
Investment securities held-to-maturity 78,921 80,321
Other investments (1) 11,260 20,554
Loans and leases 11,365,018 10,791,743
Interest Receivable 74,997 72,620
Deposits    
Deposits 13,661,922 13,360,797
Short-term borrowings 1,179,172 937,814
Long-term debt 338,556 344,115
Interest Payable 52,695 51,454
Fair value    
Financial assets    
Cash and short-term investments 932,349 1,006,019
Investment securities held-to-maturity 70,066 71,688
Other investments (1) 11,260 20,554
Loans and leases 11,157,495 10,468,144
Interest Receivable 74,997 72,620
Deposits    
Deposits 13,646,754 13,347,319
Short-term borrowings 1,179,172 937,814
Long-term debt 333,161 350,426
Interest Payable 52,695 51,454
Fair Value, Inputs, Level 1 [Member] | Fair value    
Financial assets    
Cash and short-term investments 932,349 1,006,019
Investment securities held-to-maturity 0 0
Other investments (1) 1,220 1,194
Loans and leases 0 0
Interest Receivable 0 0
Deposits    
Deposits 0 0
Short-term borrowings 1,179,172 937,814
Long-term debt 0 0
Interest Payable 5,704 15,494
Fair Value, Inputs, Level 2 [Member] | Fair value    
Financial assets    
Cash and short-term investments 0 0
Investment securities held-to-maturity 70,066 71,688
Other investments (1) 10,040 10,040
Loans and leases 0 0
Interest Receivable 15,630 15,697
Deposits    
Deposits 13,646,754 13,347,319
Short-term borrowings 0 0
Long-term debt 333,161 350,426
Interest Payable 46,991 35,960
Fair Value, Inputs, Level 3 [Member] | Fair value    
Financial assets    
Cash and short-term investments 0 0
Investment securities held-to-maturity 0 0
Other investments (1) 0 9,320
Loans and leases 11,157,495 10,468,144
Interest Receivable   56,923
Deposits    
Deposits 0 0
Short-term borrowings 0 0
Long-term debt 0 0
Interest Payable $ 0 $ 0