Securities Available-for-Sale - Summary of gross unrealized losses and fair value for those investments with unrealized losses (Detail) $ in Thousands	Sep. 30, 2024 USD ($) Number	Dec. 31, 2023 USD ($) Number
Less than 12 Months, Number of Securities | Number	11	18
Less than 12 Months, Fair Value	$ 13,473	$ 19,259
Less than 12 Months, Unrealized Losses	$ (164)	$ (220)
More than 12 Months, Number of Securities | Number	92	89
More than 12 Months, Fair Value	$ 61,511	$ 58,368
More than 12 Months, Unrealized Losses	(8,554)	(9,693)
Total, Fair Value	74,984	77,627
Total, Unrealized Losses	$ (8,718)	$ (9,913)
U.S. Government-sponsored enterprises ("GSE") obligations [Member]
More than 12 Months, Number of Securities | Number	3	3
More than 12 Months, Fair Value	$ 1,433	$ 1,398
More than 12 Months, Unrealized Losses	(216)	(270)
Total, Fair Value	1,433	1,398
Total, Unrealized Losses	$ (216)	$ (270)
U.S. Government agency small business administration pools guaranteed by SBA [Member]
Less than 12 Months, Number of Securities | Number	3	8
Less than 12 Months, Fair Value	$ 2,681	$ 8,432
Less than 12 Months, Unrealized Losses	$ (39)	$ (75)
More than 12 Months, Number of Securities | Number	5	5
More than 12 Months, Fair Value	$ 3,827	$ 3,899
More than 12 Months, Unrealized Losses	(669)	(788)
Total, Fair Value	6,508	12,331
Total, Unrealized Losses	$ (708)	$ (863)
Collateralized mortgage obligations issued by the FHLMC, FNMA and GNMA [Member]
Less than 12 Months, Number of Securities | Number	2
Less than 12 Months, Fair Value	$ 6,500
Less than 12 Months, Unrealized Losses	$ (35)
More than 12 Months, Number of Securities | Number	4	4
More than 12 Months, Fair Value	$ 2,385	$ 2,474
More than 12 Months, Unrealized Losses	(406)	(484)
Total, Fair Value	8,885	2,474
Total, Unrealized Losses	$ (441)	$ (484)
Residential mortgage backed GSE securities [Member]
Less than 12 Months, Number of Securities | Number	5	5
Less than 12 Months, Fair Value	$ 3,647	$ 4,806
Less than 12 Months, Unrealized Losses	$ (84)	$ (53)
More than 12 Months, Number of Securities | Number	24	23
More than 12 Months, Fair Value	$ 16,048	$ 15,347
More than 12 Months, Unrealized Losses	(3,165)	(3,565)
Total, Fair Value	19,695	20,153
Total, Unrealized Losses	$ (3,249)	$ (3,618)
Municipal bonds [Member]
Less than 12 Months, Number of Securities | Number	1	1
Less than 12 Months, Fair Value	$ 645	$ 1,941
Less than 12 Months, Unrealized Losses	$ (6)	$ (10)
More than 12 Months, Number of Securities | Number	50	49
More than 12 Months, Fair Value	$ 32,631	$ 30,729
More than 12 Months, Unrealized Losses	(3,268)	(3,577)
Total, Fair Value	33,276	32,670
Total, Unrealized Losses	$ (3,274)	$ (3,587)
Corporate debt [Member]
More than 12 Months, Number of Securities | Number	1	1
More than 12 Months, Fair Value	$ 487	$ 492
More than 12 Months, Unrealized Losses	(13)	(8)
Total, Fair Value	487	492
Total, Unrealized Losses	$ (13)	$ (8)
Corporate subordinated debt [Member]
Less than 12 Months, Number of Securities | Number		4
Less than 12 Months, Fair Value		$ 4,080
Less than 12 Months, Unrealized Losses		$ (82)
More than 12 Months, Number of Securities | Number	5	4
More than 12 Months, Fair Value	$ 4,700	$ 4,029
More than 12 Months, Unrealized Losses	(817)	(1,001)
Total, Fair Value	4,700	8,109
Total, Unrealized Losses	$ (817)	$ (1,083)