Loans - Loan Categories and Past Due Loans (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Financing Receivable, Past Due [Line Items]
Loans receivable held-for-sale, net, not part of disposal group	$ 165	$ 656	$ 483
Total	3,138,617	2,983,207	2,924,794
Loans 90 or More Days Past Due and Still Accruing Interest	251	1,157	514
Nonaccrual Loans	6,023	10,757	8,812
Nonaccrual With No Allowance for Credit Loss	6,023
Interest Income on Nonaccrual Loans	0
Commercial
Financing Receivable, Past Due [Line Items]
Total	148,066	140,293	138,973
Loans 90 or More Days Past Due and Still Accruing Interest	0	44	0
Nonaccrual Loans	3	8	9
Nonaccrual With No Allowance for Credit Loss	3
Interest Income on Nonaccrual Loans	0
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	734,604	707,022	679,217
Loans 90 or More Days Past Due and Still Accruing Interest	0	0	0
Nonaccrual Loans	0	3,110	3,401
Nonaccrual With No Allowance for Credit Loss	0
Interest Income on Nonaccrual Loans	0
Consumer
Financing Receivable, Past Due [Line Items]
Total	1,107,637	1,065,135	1,055,585
Loans 90 or More Days Past Due and Still Accruing Interest	0	0	0
Nonaccrual Loans	1,572	3,503	1,708
Nonaccrual With No Allowance for Credit Loss	1,572
Interest Income on Nonaccrual Loans	0
Residential
Financing Receivable, Past Due [Line Items]
Total	1,148,310	1,070,757	1,051,019
Loans 90 or More Days Past Due and Still Accruing Interest	251	1,113	514
Nonaccrual Loans	4,448	4,136	3,694
Nonaccrual With No Allowance for Credit Loss	4,448
Interest Income on Nonaccrual Loans	0
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total	39,375	28,907	20,522
Financial Asset, Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total	309	125	166
Financial Asset, Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	15,764	370	235
Financial Asset, Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total	18,321	21,677	14,975
Financial Asset, Past Due | Residential
Financing Receivable, Past Due [Line Items]
Total	4,981	6,735	5,146
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	27,590	15,908	9,349
Financing Receivables, 30 to 59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total	247	48	86
Financing Receivables, 30 to 59 Days Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	13,787	370	0
Financing Receivables, 30 to 59 Days Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total	11,864	13,657	8,870
Financing Receivables, 30 to 59 Days Past Due | Residential
Financing Receivable, Past Due [Line Items]
Total	1,692	1,833	393
Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	7,007	4,662	5,743
Financing Receivables, 60 to 89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total	59	33	80
Financing Receivables, 60 to 89 Days Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	1,977	0	0
Financing Receivables, 60 to 89 Days Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total	4,953	4,517	4,397
Financing Receivables, 60 to 89 Days Past Due | Residential
Financing Receivable, Past Due [Line Items]
Total	18	112	1,266
Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	4,778	8,337	5,430
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total	3	44	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	0	0	235
Financing Receivables, Equal to Greater than 90 Days Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total	1,504	3,503	1,708
Financing Receivables, Equal to Greater than 90 Days Past Due | Residential
Financing Receivable, Past Due [Line Items]
Total	3,271	4,790	3,487
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total	3,099,242	2,954,300	2,904,272
Financial Asset, Not Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total	147,757	140,168	138,807
Financial Asset, Not Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	718,840	706,652	678,982
Financial Asset, Not Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total	1,089,316	1,043,458	1,040,610
Financial Asset, Not Past Due | Residential
Financing Receivable, Past Due [Line Items]
Total	$ 1,143,329	$ 1,064,022	$ 1,045,873