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INVESTMENT SECURITIES - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($)
Jun. 30, 2025
Dec. 31, 2024
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost $ 853,126,000 $ 991,937,000
Allowance for Credit Losses 0 0
Net Carrying Value 853,126,000 991,937,000
Gross Unrealized Gains 251,000 2,349,000
Gross Unrealized Losses (58,942,000) (59,609,000)
Fair Value 794,435,000 934,677,000
Debt securities, held to maturity, accrued interest 1,900,000 2,400,000
Asset-backed securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 352,781,000 471,996,000
Allowance for Credit Losses 0 0
Net Carrying Value 352,781,000 471,996,000
Gross Unrealized Gains 251,000 1,775,000
Gross Unrealized Losses (1,597,000) (401,000)
Fair Value 351,435,000 473,370,000
Agency-guaranteed residential mortgage-backed securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 6,792,000 6,880,000
Allowance for Credit Losses 0 0
Net Carrying Value 6,792,000 6,880,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (942,000) (940,000)
Fair Value 5,850,000 5,940,000
Agency-guaranteed commercial mortgage-backed securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 1,729,000 1,770,000
Allowance for Credit Losses 0 0
Net Carrying Value 1,729,000 1,770,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (243,000) (146,000)
Fair Value 1,486,000 1,624,000
Agency-guaranteed residential collateralized mortgage obligations    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 161,284,000 169,754,000
Allowance for Credit Losses 0 0
Net Carrying Value 161,284,000 169,754,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (17,502,000) (21,984,000)
Fair Value 143,782,000 147,770,000
Agency-guaranteed commercial collateralized mortgage obligations    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 170,372,000 158,320,000
Allowance for Credit Losses 0 0
Net Carrying Value 170,372,000 158,320,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (25,156,000) (22,689,000)
Fair Value 145,216,000 135,631,000
Private label collateralized mortgage obligations    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 160,168,000 183,217,000
Allowance for Credit Losses 0 0
Net Carrying Value 160,168,000 183,217,000
Gross Unrealized Gains 0 574,000
Gross Unrealized Losses (13,502,000) (13,449,000)
Fair Value $ 146,666,000 $ 170,342,000