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v3.23.1

Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | $ 870,294,000 | $ 840,259,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 870,294,000 | 840,259,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (33,581,000) | (46,446,000)
Fair Value | 836,713,000 | 793,813,000
Debt securities, held to maturity, accrued interest | 1,500,000 | 1,000,000
Asset-backed securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 322,877,000 | 361,107,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 322,877,000 | 361,107,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3,142,000) | (4,974,000)
Fair Value | 319,735,000 | 356,133,000
Agency-guaranteed residential mortgage-backed securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 7,152,000 | 7,189,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 7,152,000 | 7,189,000
Gross Unrealized Gains |  |
Gross Unrealized Losses | (513,000) | (563,000)
Fair Value | 6,639,000 | 6,626,000
Agency-guaranteed commercial mortgage-backed securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 1,909,000 | 1,928,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 1,909,000 | 1,928,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (61,000) | (104,000)
Fair Value | 1,848,000 | 1,824,000
Agency-guaranteed residential collateralized mortgage obligations |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 201,097,000 | 204,495,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 201,097,000 | 204,495,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (13,136,000) | (18,376,000)
Fair Value | 187,961,000 | 186,119,000
Agency-guaranteed commercial collateralized mortgage obligations |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 150,852,000 | 151,711,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 150,852,000 | 151,711,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (7,239,000) | (9,435,000)
Fair Value | 143,613,000 | 142,276,000
Private label collateralized mortgage obligations |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 186,407,000 | 113,829,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 186,407,000 | 113,829,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (9,490,000) | (12,994,000)
Fair Value | $ 176,917,000 | $ 100,835,000

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