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INVESTMENT SECURITIES - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost $ 962,799,000 $ 1,103,170,000
Allowance for Credit Losses 0 0
Net Carrying Value 962,799,000 1,103,170,000
Gross Unrealized Gains 1,148,000 202,000
Gross Unrealized Losses (55,872,000) (56,933,000)
Fair Value 908,075,000 1,046,439,000
Debt securities, held to maturity, accrued interest 2,200,000 2,700,000
Asset-backed securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 446,070,000 575,990,000
Allowance for Credit Losses 0 0
Net Carrying Value 446,070,000 575,990,000
Gross Unrealized Gains 1,148,000 202,000
Gross Unrealized Losses (1,515,000) (2,064,000)
Fair Value 445,703,000 574,128,000
Agency-guaranteed residential mortgage-backed securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 6,960,000 7,039,000
Allowance for Credit Losses 0 0
Net Carrying Value 6,960,000 7,039,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (849,000) (649,000)
Fair Value 6,111,000 6,390,000
Agency-guaranteed commercial mortgage-backed securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 1,810,000 1,850,000
Allowance for Credit Losses 0 0
Net Carrying Value 1,810,000 1,850,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (317,000) (134,000)
Fair Value 1,493,000 1,716,000
Agency-guaranteed residential collateralized mortgage obligations    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 178,761,000 186,636,000
Allowance for Credit Losses 0 0
Net Carrying Value 178,761,000 186,636,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (18,037,000) (19,049,000)
Fair Value 160,724,000 167,587,000
Agency-guaranteed commercial collateralized mortgage obligations    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 145,173,000 146,765,000
Allowance for Credit Losses 0 0
Net Carrying Value 145,173,000 146,765,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (21,899,000) (23,178,000)
Fair Value 123,274,000 123,587,000
Private label collateralized mortgage obligations    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 184,025,000 184,890,000
Allowance for Credit Losses 0 0
Net Carrying Value 184,025,000 184,890,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (13,255,000) (11,859,000)
Fair Value $ 170,770,000 $ 173,031,000