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FAIR VALUE DISCLOSURES - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Financial assets    
Investment securities held-to-maturity $ 82,372 $ 84,021
Other investments 141,892 143,160
Loans held for sale 15,300 7,900
Interest Receivable 50,023 47,500
Deposits    
Noninterest-bearing 3,605,181 4,135,180
Savings 3,785,445 3,828,139
Time 2,484,780 1,700,705
Impaired Commercial And Commercial Real Estate Loans Member    
Deposits    
Principal Amount of Commercial and Commercial Real Estate Loans 13,200 11,900
Allowance for Loan and Lease Losses, Real Estate 6,700 3,700
Carrying value    
Financial assets    
Cash and short-term investments 702,626 595,683
Investment securities held-to-maturity 82,372 84,021
Other investments 141,892 143,160
Loans and leases 10,401,563 10,165,994
Interest Receivable 66,601 63,721
Deposits    
Deposits 12,794,878 12,701,177
Short-term borrowings 1,216,283 1,287,156
Long-term debt 339,963 346,672
Interest Payable 42,088 11,150
Fair value    
Financial assets    
Cash and short-term investments 702,626 595,683
Investment securities held-to-maturity 72,399 76,485
Other investments 141,892 143,160
Loans and leases 10,044,684 9,916,353
Interest Receivable 66,601 63,721
Deposits    
Deposits 12,765,390 12,670,747
Short-term borrowings 1,216,283 1,287,156
Long-term debt 341,400 348,041
Interest Payable 42,088 11,150
Fair Value, Inputs, Level 1 [Member] | Fair value    
Financial assets    
Cash and short-term investments 702,626 595,683
Investment securities held-to-maturity 0 0
Other investments 994 1,171
Loans and leases 0 0
Interest Receivable 0 0
Deposits    
Deposits 0 0
Short-term borrowings 1,216,283 1,287,156
Long-term debt 0 0
Interest Payable 12,049 3,835
Fair Value, Inputs, Level 2 [Member] | Fair value    
Financial assets    
Cash and short-term investments 0 0
Investment securities held-to-maturity 72,399 76,485
Other investments 131,527 132,853
Loans and leases 0 0
Interest Receivable 16,578 16,233
Deposits    
Deposits 12,765,390 12,670,747
Short-term borrowings 0 0
Long-term debt 341,400 348,041
Interest Payable 30,039 7,315
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 9,371 9,136
Loans and leases 10,044,684 9,916,353
Interest Receivable   47,488
Deposits    
Deposits 0 0
Short-term borrowings 0 0
Long-term debt 0 0
Interest Payable $ 0 $ 0