Loans and the Allowance for Credit Losses - Loans Receivable Disaggregated by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Residential Mortgage
Financing Receivable Recorded Investment [Line Items]
2023	$ 69,513	$ 314,599
2022	334,679	511,217
2021	509,090	276,904
2020	281,594	113,566
2019	114,208	78,304
Prior	318,376	354,248
Total	1,627,460	1,648,838
Residential Mortgage | Current
Financing Receivable Recorded Investment [Line Items]
2023	69,513	314,599
2022	334,679	511,217
2021	509,090	276,698
2020	281,397	113,251
2019	112,467	77,620
Prior	313,572	350,098
Total	1,620,718	1,643,483
Residential Mortgage | Non-Performing Loans
Financing Receivable Recorded Investment [Line Items]
2021		206
2020	197	315
2019	1,741	684
Prior	4,804	4,150
Total	6,742	5,355
Home Equity
Financing Receivable Recorded Investment [Line Items]
2023	4,904	3,611
2022	4,335
2021	2,590
2020	1,554	58
2019	3,037	360
Prior	15,019	481
Revolving loans amortized cost basis	61,925	106,841
Total	93,364	111,351
Home Equity | Current
Financing Receivable Recorded Investment [Line Items]
2023	4,904	3,611
2022	4,335
2021	2,590
2020	1,554	58
2019	3,037	360
Prior	14,635	481
Revolving loans amortized cost basis	61,925	106,119
Total	92,980	110,629
Home Equity | Non-Performing Loans
Financing Receivable Recorded Investment [Line Items]
Prior	384
Revolving loans amortized cost basis		722
Total	384	722
Consumer
Financing Receivable Recorded Investment [Line Items]
2023	9,346	13,214
2022	8,080	8,482
2021	3,765	5,353
2020	2,713	444
2019	693	2,078
Prior	3,733	7,424
Revolving loans amortized cost basis	562	599
Total	28,892	37,594
Current period gross writeoffs	61
Consumer | Current
Financing Receivable Recorded Investment [Line Items]
2023	9,346	13,214
2022	8,080	8,482
2021	3,765	5,353
2020	2,713	444
2019	693	2,078
Prior	3,733	7,424
Revolving loans amortized cost basis	562	599
Total	28,892	37,594
Commercial Mortgage
Financing Receivable Recorded Investment [Line Items]
2023	41,698	411,927
2022	460,104	330,593
2021	369,863	226,635
2020	230,424	302,166
2019	309,205	147,095
Prior	511,161	496,007
Total	1,922,455	1,914,423
Commercial Mortgage | 1-6 (Pass)
Financing Receivable Recorded Investment [Line Items]
2023	39,862	411,927
2022	460,104	330,593
2021	369,863	222,073
2020	228,365	260,588
2019	265,300	125,398
Prior	475,177	489,564
Total	1,838,671	1,840,143
Commercial Mortgage | 7 (Special Mention)
Financing Receivable Recorded Investment [Line Items]
2023	1,836
2021		4,562
2020	2,059	41,578
2019	43,905	21,697
Prior	26,138	6,132
Total	73,938	73,969
Commercial Mortgage | 8 (Substandard)
Financing Receivable Recorded Investment [Line Items]
Prior	9,846	311
Total	9,846	311
Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
2023	46,650	128,301
2022	132,959	71,938
2021	52,713	62,783
2020	56,861	30,820
2019	24,518	19,282
Prior	41,680	37,041
Revolving loans amortized cost basis	415	485
Total	355,796	350,650
Current period gross writeoffs	62
Commercial and Industrial | 1-6 (Pass)
Financing Receivable Recorded Investment [Line Items]
2023	46,078	128,301
2022	127,841	67,727
2021	52,592	62,025
2020	53,802	28,557
2019	22,634	18,794
Prior	41,426	36,836
Revolving loans amortized cost basis	405	475
Total	344,778	342,715
Commercial and Industrial | 7 (Special Mention)
Financing Receivable Recorded Investment [Line Items]
2023	572
2022	5,118	4,211
2021	121	130
2020	2,795	161
2019	183	407
Prior	121	121
Revolving loans amortized cost basis	10	10
Total	8,920	5,040
Commercial and Industrial | 8 (Substandard)
Financing Receivable Recorded Investment [Line Items]
2021		628
2020	264	2,102
2019	1,701	81
Prior	133	84
Total	$ 2,098	$ 2,895