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Loans Receivable - Summary of Allowance for Loan Losses On Loans Receivables (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Allowance for loan losses:
Beginning balance	$ 17,970	$ 16,666	$ 16,461	$ 16,620
CECL adoption			(301)
CECL day 1 provision			1,707
Purchased credit deteriorated loans			601
Provision	0	200	1,340	200
Charge-offs	0	(200)	(1,868)	(400)
Recoveries	22	0	52	246
Total	17,992	16,666	17,992	16,666
Individually evaluated for impairment	0		0		$ 118
Collectively evaluated for impairment	17,992		17,992		16,343
Loans:
Individually evaluated for impairment	9,753		9,753		12,377
Collectively evaluated for impairment	1,491,058		1,491,058		1,360,447
Ending balance	1,500,811		1,500,811		1,372,824
Commercial real estate [Member]
Allowance for loan losses:
Beginning balance	12,123	8,683	8,654	7,458
CECL adoption			1,384
CECL day 1 provision			1,586
Purchased credit deteriorated loans			499
Provision	3,301	413	4,994	1,592
Charge-offs	0	(200)	(1,718)	(400)
Recoveries	4	0	29	246
Total	15,428	8,896	15,428	8,896
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	15,428		15,428		8,654
Loans:
Individually evaluated for impairment	4,485		4,485		12,030
Collectively evaluated for impairment	1,075,803		1,075,803		861,543
Ending balance	1,080,288		1,080,288		873,573
Commercial and industrial [Member]
Allowance for loan losses:
Beginning balance	407	279	271	713
CECL adoption			(73)
CECL day 1 provision			105
Purchased credit deteriorated loans			102
Provision	(81)	11	(84)	(423)
Charge-offs	0	0	0	0
Recoveries	18	0	23	0
Total	344	290	344	290
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	344		344		271
Loans:
Individually evaluated for impairment	2,232		2,232		10
Collectively evaluated for impairment	49,925		49,925		28,849
Ending balance	52,157		52,157		28,859
Construction [Member]
Allowance for loan losses:
Beginning balance	4,529	6,430	6,289	7,228
CECL adoption			(1,269)
CECL day 1 provision			0
Purchased credit deteriorated loans			0
Provision	(3,219)	(304)	(3,562)	(1,102)
Charge-offs	0	0	(148)	0
Recoveries	0	0	0	0
Total	1,310	6,126	1,310	6,126
Individually evaluated for impairment	0		0		118
Collectively evaluated for impairment	1,310		1,310		6,171
Loans:
Individually evaluated for impairment	2,925		2,925		148
Collectively evaluated for impairment	317,899		317,899		417,390
Ending balance	320,824		320,824		417,538
Residential first-lien mortgage [Member]
Allowance for loan losses:
Beginning balance	661	259	236	267
CECL adoption			428
CECL day 1 provision			16
Purchased credit deteriorated loans			0
Provision	160	(8)	143	(16)
Charge-offs	0	0	(2)	0
Recoveries	0	0	0	0
Total	821	251	821	251
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	821		821		236
Loans:
Individually evaluated for impairment	111		111		118
Collectively evaluated for impairment	39,571		39,571		43,007
Ending balance	39,682		39,682		43,125
Home equity/consumer [Member]
Allowance for loan losses:
Beginning balance	250	50	45	48
CECL adoption			195
CECL day 1 provision			0
Purchased credit deteriorated loans			0
Provision	(161)	(5)	(151)	(3)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Total	89	45	89	45
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	89		89		45
Loans:
Individually evaluated for impairment	0		0		71
Collectively evaluated for impairment	7,860		7,860		9,658
Ending balance	7,860		7,860		9,729
Unallocated [Member]
Allowance for loan losses:
Beginning balance	0	965	966	906
CECL adoption			(966)
CECL day 1 provision			0
Purchased credit deteriorated loans			0
Provision	0	93	0	152
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Total	0	$ 1,058	0	$ 1,058
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	0		0		966
Loans:
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	0		0		0
Ending balance	$ 0		$ 0		$ 0

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