Investment and Equity Securities - Carrying Amounts and Fair Values of Securities Available for Sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	$ 366,492	$ 365,936
Available-for-sale Securities, Gross Unrealized Gains	278	134
Available-for-sale Securities, Gross Unrealized Losses	35,616	41,387
Available-for-sale Securities, Fair Value	331,154	324,683
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	54,957	54,948
Available-for-sale Securities, Gross Unrealized Losses	3,605	4,318
Available-for-sale Securities, Fair Value	51,352	50,630
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	40,280	34,746
Available-for-sale Securities, Gross Unrealized Gains	54	64
Available-for-sale Securities, Gross Unrealized Losses	913	1,048
Available-for-sale Securities, Fair Value	39,421	33,762
GSE - Mortgage-backed Securities and CMO's [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	129,524	132,059
Available-for-sale Securities, Gross Unrealized Gains	15
Available-for-sale Securities, Gross Unrealized Losses	14,714	16,064
Available-for-sale Securities, Fair Value	114,825	115,995
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	34,930	37,228
Available-for-sale Securities, Gross Unrealized Gains	155	70
Available-for-sale Securities, Gross Unrealized Losses	441	612
Available-for-sale Securities, Fair Value	34,644	36,686
State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	100,801	100,955
Available-for-sale Securities, Gross Unrealized Gains	54
Available-for-sale Securities, Gross Unrealized Losses	15,335	18,689
Available-for-sale Securities, Fair Value	85,520	82,266
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	6,000	6,000
Available-for-sale Securities, Gross Unrealized Losses	608	656
Available-for-sale Securities, Fair Value	$ 5,392	$ 5,344

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Topic 320
-SubTopic 10
-Section 50
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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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