Composition of Allowance for Loan Losses and Related Recorded Investment in Loans (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period				$ 14,870				$ 12,329	$ 14,870	$ 12,329	$ 12,659
Provision charged to expense	$ 873	$ 572	$ 586	686	$ 406	$ 620	$ 271	1,146	2,717	2,443	258
Losses charged-off									(1,380)	(6)	(732)
Recoveries									145	104	144
Balance, end of period	16,352				14,870				16,352	14,870	12,329
Ending balance: individually evaluated for impairment	243				292				243	292	459
Ending balance: collectively evaluated for impairment	16,109				14,578				16,109	14,578	11,870
Ending balance: individually evaluated for impairment	17,651				19,352				17,651	19,352	19,232
Ending balance: collectively evaluated for impairment	1,304,447				1,152,701				1,304,447	1,152,701	946,864
Total	1,322,098				1,172,053				1,322,098	1,172,053	966,096
1-4 Family Owner-Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period				1,260				1,067	1,260	1,067	1,208
Provision charged to expense									(127)	193	(141)
Recoveries									45
Balance, end of period	1,178				1,260				1,178	1,260	1,067
Ending balance: individually evaluated for impairment	114				134				114	134	149
Ending balance: collectively evaluated for impairment	1,064				1,126				1,064	1,126	918
Ending balance: individually evaluated for impairment	5,854				5,754				5,854	5,754	5,572
Ending balance: collectively evaluated for impairment	91,093				93,041				91,093	93,041	86,371
Total	96,947				98,795				96,947	98,795	91,943
Multifamily
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period				5,214				3,865	5,214	3,865	3,829
Provision charged to expense									508	1,349	36
Losses charged-off									(38)
Balance, end of period	5,684				5,214				5,684	5,214	3,865
Ending balance: collectively evaluated for impairment	5,684				5,214				5,684	5,214	3,865
Ending balance: individually evaluated for impairment	1,200				946				1,200	946
Ending balance: collectively evaluated for impairment	347,100				306,465				347,100	306,465	250,239
Total	348,300				307,411				348,300	307,411	250,239
Nonresidential
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period				2,194				1,849	2,194	1,849	1,925
Provision charged to expense									(29)	341	(85)
Recoveries										4	9
Balance, end of period	2,165				2,194				2,165	2,194	1,849
Ending balance: individually evaluated for impairment	38				40				38	40	31
Ending balance: collectively evaluated for impairment	2,127				2,154				2,127	2,154	1,818
Ending balance: individually evaluated for impairment	2,995				5,184				2,995	5,184	5,548
Ending balance: collectively evaluated for impairment	236,696				213,745				236,696	213,745	201,677
Total	239,691				218,929				239,691	218,929	207,225
1-4 Family Residential Investor Owned
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period				3,850				3,503	3,850	3,503	3,799
Provision charged to expense									(318)	347	(311)
Losses charged-off											(8)
Recoveries									8		23
Balance, end of period	3,540				3,850				3,540	3,850	3,503
Ending balance: individually evaluated for impairment	91				118				91	118	265
Ending balance: collectively evaluated for impairment	3,449				3,732				3,449	3,732	3,238
Ending balance: individually evaluated for impairment	6,672				7,468				6,672	7,468	6,973
Ending balance: collectively evaluated for impairment	310,632				312,128				310,632	312,128	298,299
Total	317,304				319,596				317,304	319,596	305,272
Construction and Land
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period				1,820				1,782	1,820	1,782	1,631
Provision charged to expense									204	38	151
Balance, end of period	2,024				1,820				2,024	1,820	1,782
Ending balance: collectively evaluated for impairment	2,024				1,820				2,024	1,820	1,782
Ending balance: individually evaluated for impairment	917								917		1,125
Ending balance: collectively evaluated for impairment	133,734				105,858				133,734	105,858	98,184
Total	134,651				105,858				134,651	105,858	99,309
Business
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period				254				254	254	254	260
Provision charged to expense									(32)	(95)	608
Losses charged-off											(724)
Recoveries									84	95	110
Balance, end of period	306				254				306	254	254
Ending balance: individually evaluated for impairment											14
Ending balance: collectively evaluated for impairment	306				254				306	254	240
Ending balance: individually evaluated for impairment	13								13		14
Ending balance: collectively evaluated for impairment	150,499				94,947				150,499	94,947	10,863
Total	150,512				94,947				150,512	94,947	10,877
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period				$ 278				$ 9	278	9	7
Provision charged to expense									2,511	270
Losses charged-off									(1,342)	(6)
Recoveries									8	5	2
Balance, end of period	1,455				278				1,455	278	9
Ending balance: collectively evaluated for impairment	1,455				278				1,455	278	9
Ending balance: collectively evaluated for impairment	34,693				26,517				34,693	26,517	1,231
Total	$ 34,693				$ 26,517				$ 34,693	$ 26,517	$ 1,231