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FAIR VALUE - Carrying amounts and estimated fair values of other financial instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financial assets:    
Held-to-maturity securities $ 1,360,889 $ 1,220,168
Carrying Value    
Financial assets:    
Net loans 10,665,318 10,353,251
Held-to-maturity securities 1,442,308 1,345,155
Financial liabilities:    
Deposits 14,056,850 13,441,707
Overnight borrowings 67,900 118,000
Securities sold under agreement to repurchase, short-term 224,169 261,553
Other Federal Home Loan Bank borrowings 462,875 610,646
Fair Value    
Financial assets:    
Net loans 10,574,472 9,969,696
Held-to-maturity securities 1,360,889 1,220,168
Financial liabilities:    
Deposits 14,046,118 13,428,682
Overnight borrowings 67,900 118,000
Securities sold under agreement to repurchase, short-term 224,169 261,553
Other Federal Home Loan Bank borrowings $ 471,305 $ 620,045