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INVESTMENT SECURITIES - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
position
security
issuer
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
position
security
issuer
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
position
security
Debt Securities, Available-for-sale [Line Items]          
Proceeds from sales of investment securities available for sale $ 450,400,000 $ 218,700,000 $ 450,423,000 $ 240,688,000  
Number of available-for-sale investment securities, unrealized loss position, less than twelve month category | security 30   30    
Number of available-for-sale investment securities, unrealized loss position, twelve month or more category | security 40   40    
Number of available-for-sale investment securities, unrealized loss position | security 70   70   117
Number of issuers | issuer 2   2    
Accrued interest reversal $ 0   $ 4,100,000 $ 0  
Debt securities, available for sale 1,846,566,000   1,846,566,000   $ 1,985,438,000
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest 0   0   0
Asset Pledged as Collateral          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available for sale 1,200,000,000   1,200,000,000   1,300,000,000
Debt securities 391,200,000   391,200,000   $ 386,400,000
Corporate notes          
Debt Securities, Available-for-sale [Line Items]          
Notes acquired $ 5,100,000   $ 5,100,000    
Number of securities on nonaccrual status | position 11   11   1
Accrued interest reversal   $ 0      
Debt securities, available for sale $ 366,210,000   $ 366,210,000   $ 516,330,000
Asset-backed securities          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available for sale 228,698,000   228,698,000   13,236,000
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest $ 0   $ 0   $ 0