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INVESTMENT SECURITIES - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($)
Mar. 31, 2025
Dec. 31, 2024
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost $ 938,161,000 $ 991,937,000
Allowance for Credit Losses 0 0
Net Carrying Value 938,161,000 991,937,000
Gross Unrealized Gains 769,000 2,349,000
Gross Unrealized Losses (52,392,000) (59,609,000)
Fair Value 886,538,000 934,677,000
Debt securities, held to maturity, accrued interest 2,200,000 2,400,000
Asset-backed securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 409,904,000 471,996,000
Allowance for Credit Losses 0 0
Net Carrying Value 409,904,000 471,996,000
Gross Unrealized Gains 397,000 1,775,000
Gross Unrealized Losses (1,631,000) (401,000)
Fair Value 408,670,000 473,370,000
Agency-guaranteed residential mortgage-backed securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 6,833,000 6,880,000
Allowance for Credit Losses 0 0
Net Carrying Value 6,833,000 6,880,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (822,000) (940,000)
Fair Value 6,011,000 5,940,000
Agency-guaranteed commercial mortgage-backed securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 1,750,000 1,770,000
Allowance for Credit Losses 0 0
Net Carrying Value 1,750,000 1,770,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (262,000) (146,000)
Fair Value 1,488,000 1,624,000
Agency-guaranteed residential collateralized mortgage obligations    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 165,521,000 169,754,000
Allowance for Credit Losses 0 0
Net Carrying Value 165,521,000 169,754,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (16,848,000) (21,984,000)
Fair Value 148,673,000 147,770,000
Agency-guaranteed commercial collateralized mortgage obligations    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 171,307,000 158,320,000
Allowance for Credit Losses 0 0
Net Carrying Value 171,307,000 158,320,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (21,702,000) (22,689,000)
Fair Value 149,605,000 135,631,000
Private label collateralized mortgage obligations    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 182,846,000 183,217,000
Allowance for Credit Losses 0 0
Net Carrying Value 182,846,000 183,217,000
Gross Unrealized Gains 372,000 574,000
Gross Unrealized Losses (11,127,000) (13,449,000)
Fair Value $ 172,091,000 $ 170,342,000