v3.26.1
DEBT SECURITIES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 01, 2022
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]            
Debt securities, available-for-sale and held to maturity, accrued interest, after allowance for credit loss   $ 21,400   $ 21,400   $ 20,200
Debt securities, available-for-sale, accrued interest, after allowance for credit loss   19,100   19,100   17,800
Debt securities, held-to-maturity, accrued interest, after allowance for credit loss   2,100   2,100   2,200
Trading securities   46,595   46,595   49,518
Trading gains (losses) recorded in servicing income   (431) $ 0 (964) $ 0  
Tax exempt interest income on available-for-sale securities   4,200 773 8,500 1,500  
Unrealized loss accreted to interest income   593 $ 625 1,200 $ 1,300  
Debt securities, available-for-sale, transfer to held-to-maturity, gain (loss)   0   0    
Allowance for credit loss on debt securities, held-to-maturity           0
Allowance for credit loss on debt securities, available-for-sale   0   0    
US Treasury Notes Securities            
Debt Securities, Available-for-sale [Line Items]            
Trading securities   46,600   46,600   $ 49,500
Asset Pledged as Collateral | Public, Trust And Bankruptcy Deposits            
Debt Securities, Available-for-sale [Line Items]            
Public funds included in deposits, pledged collateral, amount   1,700,000   1,700,000    
Equity Securities | Asset Pledged as Collateral | Federal Reserve Bank Discount Window            
Debt Securities, Available-for-sale [Line Items]            
Public funds included in deposits, pledged collateral, amount   $ 3,500,000   $ 3,500,000    
Residential and Commercial Portfolio Segment | Residential and Commercial Mortgage            
Debt Securities, Available-for-sale [Line Items]            
Transfers of securities available-for-sale to held-to-maturity $ 1,700,000          
Residential and Commercial Portfolio Segment | Residential and Commercial Mortgage | Securities            
Debt Securities, Available-for-sale [Line Items]            
Other comprehensive income, amount remaining of debt securities available for sale transfer to held to maturity, before tax 23,500          
Other comprehensive income, amount remaining of debt securities available for sale transfer to held to maturity, net of deferred taxes $ 16,700