XML 62 R50.htm IDEA: XBRL DOCUMENT v3.24.3
INVESTMENT SECURITIES - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($)
Sep. 30, 2024
Dec. 31, 2023
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost $ 1,064,437,000 $ 1,103,170,000
Allowance for Credit Losses 0 0
Net Carrying Value 1,064,437,000 1,103,170,000
Gross Unrealized Gains 2,417,000 202,000
Gross Unrealized Losses (39,340,000) (56,933,000)
Fair Value 1,027,514,000 1,046,439,000
Debt securities, held to maturity, accrued interest 2,600,000 2,700,000
Asset-backed securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 538,832,000 575,990,000
Allowance for Credit Losses 0 0
Net Carrying Value 538,832,000 575,990,000
Gross Unrealized Gains 1,628,000 202,000
Gross Unrealized Losses (184,000) (2,064,000)
Fair Value 540,276,000 574,128,000
Agency-guaranteed residential mortgage-backed securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 6,920,000 7,039,000
Allowance for Credit Losses 0 0
Net Carrying Value 6,920,000 7,039,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (522,000) (649,000)
Fair Value 6,398,000 6,390,000
Agency-guaranteed commercial mortgage-backed securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 1,790,000 1,850,000
Allowance for Credit Losses 0 0
Net Carrying Value 1,790,000 1,850,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (271,000) (134,000)
Fair Value 1,519,000 1,716,000
Agency-guaranteed residential collateralized mortgage obligations    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 174,098,000 186,636,000
Allowance for Credit Losses 0 0
Net Carrying Value 174,098,000 186,636,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (11,221,000) (19,049,000)
Fair Value 162,877,000 167,587,000
Agency-guaranteed commercial collateralized mortgage obligations    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 159,050,000 146,765,000
Allowance for Credit Losses 0 0
Net Carrying Value 159,050,000 146,765,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (19,426,000) (23,178,000)
Fair Value 139,624,000 123,587,000
Private label collateralized mortgage obligations    
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 183,747,000 184,890,000
Allowance for Credit Losses 0 0
Net Carrying Value 183,747,000 184,890,000
Gross Unrealized Gains 789,000 0
Gross Unrealized Losses (7,716,000) (11,859,000)
Fair Value $ 176,820,000 $ 173,031,000