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Investment Securities - Summary of Securities Available For Sale By Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items]
Amortized cost	$ 234,602	$ 259,658
Fair value due in one year or less	51,227	129,849
Fair value due after one year through five years	68,356	69,181
Fair value	224,763	247,171
Prepayment of Obligation [Member]
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items]
Amortized cost due in one year or less	2,122
Amortized cost due after one year through five years	9,427
Amortized cost due after five years through ten years	41,975
Amortized cost due after ten years	5,342
Amortized cost	234,602
Fair value due in one year or less	2,122
Fair value due after one year through five years	9,334
Fair value due after five years through ten years	38,369
Fair value due after ten years	4,493
Fair value	224,763
Mortgage-backed securities - U.S. Government Sponsored Enterprises (GSEs) [Member]
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items]
Amortized cost	175,736	197,792
Fair value due in one year or less	41,075	122,763
Fair value due after one year through five years	28,055	29,229
Fair value	170,445	$ 190,545
Mortgage-backed securities - U.S. Government Sponsored Enterprises (GSEs) [Member] | Prepayment of Obligation [Member]
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items]
Amortized cost	175,736
Fair value	$ 170,445

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