Allowance for Credit Losses on Loans and Off-Balance Sheet Credit Exposures - Schedule Of Allowance For Loan Losses, By Class (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	$ 6,934	$ 8,336	$ 8,339	$ 8,336
Charge-Offs	(4)	(1)	(4)	(2)
Recoveries	1	5	1	6
Credit Loss Expense (Benefit)	(151)	0	(61)	0
Balance end of period	6,780	8,340	6,780	8,340
Impact of CECL Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period			(1,495)
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	2,214	2,224	2,417	2,068
Charge-Offs	0	0	0	0
Recoveries	0	0	0	0
Credit Loss Expense (Benefit)	122	15	164	171
Balance end of period	2,336	2,239	2,336	2,239
Residential real estate | Non-revolving residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	2,071		2,294
Charge-Offs	0		0
Recoveries	0		0
Credit Loss Expense (Benefit)	121		168
Balance end of period	2,192		2,192
Residential real estate | Revolving residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	143		123
Charge-Offs	0		0
Recoveries	0		0
Credit Loss Expense (Benefit)	1		(4)
Balance end of period	144		144
Residential real estate | Impact of CECL Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period			(245)
Residential real estate | Impact of CECL Adoption | Non-revolving residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period			(270)
Residential real estate | Impact of CECL Adoption | Revolving residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period			25
Construction real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	1,861	843	1,032	837
Charge-Offs	0	0	0	0
Recoveries	0	0	0	0
Credit Loss Expense (Benefit)	(187)	114	(50)	120
Balance end of period	1,674	957	1,674	957
Construction real estate | Commercial construction real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	1,713		611
Charge-Offs	0		0
Recoveries	0		0
Credit Loss Expense (Benefit)	(188)		(68)
Balance end of period	1,525		1,525
Construction real estate | Residential construction real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	148		421
Charge-Offs	0		0
Recoveries	0		0
Credit Loss Expense (Benefit)	1		18
Balance end of period	149		149
Construction real estate | Impact of CECL Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period			692
Construction real estate | Impact of CECL Adoption | Commercial construction real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period			982
Construction real estate | Impact of CECL Adoption | Residential construction real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period			(290)
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	2,407	3,997	3,935	4,122
Charge-Offs	0	0	0	0
Recoveries	0	0	0	0
Credit Loss Expense (Benefit)	(23)	7	(14)	(118)
Balance end of period	2,384	4,004	2,384	4,004
Commercial real estate | Non-residential commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	2,186		2,931
Charge-Offs	0		0
Recoveries	0		0
Credit Loss Expense (Benefit)	(34)		(22)
Balance end of period	2,152		2,152
Commercial real estate | Multi-family residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	221		1,004
Charge-Offs	0		0
Recoveries	0		0
Credit Loss Expense (Benefit)	11		8
Balance end of period	232		232
Commercial real estate | Impact of CECL Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period			(1,537)
Commercial real estate | Impact of CECL Adoption | Non-residential commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period			(757)
Commercial real estate | Impact of CECL Adoption | Multi-family residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period			(780)
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	368	289	301	275
Charge-Offs	0	(1)	0	(1)
Recoveries	0	2	0	2
Credit Loss Expense (Benefit)	(14)	28	(138)	42
Balance end of period	354	318	354	318
Commercial | Impact of CECL Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period			191
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	5	10	10	11
Charge-Offs	(4)	0	(4)	(1)
Recoveries	1	3	1	4
Credit Loss Expense (Benefit)	3	(3)	3	(4)
Balance end of period	5	10	5	10
Consumer | Impact of CECL Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period			(5)
Municipal
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	79	88	95	86
Charge-Offs	0	0	0	0
Recoveries	0	0	0	0
Credit Loss Expense (Benefit)	(52)	(61)	(26)	(59)
Balance end of period	27	27	27	27
Municipal | Impact of CECL Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period			(42)
Unallocated
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period		885	549	937
Charge-Offs		0	0	0
Recoveries		0	0	0
Credit Loss Expense (Benefit)		(100)	0	(152)
Balance end of period	$ 0	$ 785	0	$ 785
Unallocated | Impact of CECL Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period			$ (549)