v3.26.1
INVESTMENT SECURITIES - Additional Information (Detail)
3 Months Ended
Mar. 31, 2026
USD ($)
security
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
security
Debt Securities, Available-for-sale [Line Items]      
Proceeds from sales of investment securities available for sale $ 41,296,000 $ 0  
Number of available-for-sale investment securities, unrealized loss position, less than twelve month category | security 33    
Number of available-for-sale investment securities, unrealized loss position, twelve month or more category | security 43    
Number of available-for-sale investment securities, unrealized loss position | security 76   57
Accrued interest reversal $ 0 $ 4,100,000  
Debt securities, available for sale 1,961,852,000   $ 1,906,535,000
Investment securities held to maturity 663,545,000   729,134,000
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest 0   0
Asset Pledged as Collateral      
Debt Securities, Available-for-sale [Line Items]      
Debt securities, available for sale 1,400,000,000   1,400,000,000
Debt securities 393,000,000.0   406,500,000
Corporate notes      
Debt Securities, Available-for-sale [Line Items]      
Debt securities, available for sale 246,298,000   285,858,000
Asset-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Debt securities, available for sale 275,706,000   237,813,000
Investment securities held to maturity 217,790,000   258,371,000
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest $ 0   $ 0