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Investment Securities - Summary of Securities Available For Sale By Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items]
Amortized cost	$ 217,793	$ 259,658
Fair value due in one year or less	38,327	129,849
Fair value due after one year through five years	64,711	69,181
Fair value	209,928	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	2,554
Amortized cost due after one year through five years	10,849
Amortized cost due after five years through ten years	41,234
Amortized cost due after ten years	3,337
Amortized cost	217,793
Fair value due in one year or less	2,555
Fair value due after one year through five years	10,776
Fair value due after five years through ten years	38,397
Fair value due after ten years	2,934
Fair value	209,928
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	159,819	197,792
Fair value due in one year or less	31,883	122,763
Fair value due after one year through five years	27,639	29,229
Fair value	$ 155,266	$ 190,545

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