Loans - Loan Categories and Past Due Loans (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Financing Receivable, Past Due [Line Items]
Loans receivable held-for-sale, net, not part of disposal group	$ 1,992	$ 11,085	$ 12,007
Total	2,644,082	2,595,030	2,561,915
Loans 90 or More Days Past Due and Still Accruing Interest	595	228	901
Nonaccrual Loans	7,102	6,033	5,461
Nonaccrual With No Allowance for Credit Loss	4,318
Interest Income on Nonaccrual Loans	0
Commercial
Financing Receivable, Past Due [Line Items]
Total	242,790	240,554	276,671
Loans 90 or More Days Past Due and Still Accruing Interest	0	0	8
Nonaccrual Loans	69	78	163
Nonaccrual With No Allowance for Credit Loss	69
Interest Income on Nonaccrual Loans	0
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	598,242	571,787	533,032
Loans 90 or More Days Past Due and Still Accruing Interest	0	184	237
Nonaccrual Loans	4,425	1,475	1,439
Nonaccrual With No Allowance for Credit Loss	1,641
Interest Income on Nonaccrual Loans	0
Consumer
Financing Receivable, Past Due [Line Items]
Total	892,549	859,768	828,493
Loans 90 or More Days Past Due and Still Accruing Interest	159	0	505
Nonaccrual Loans	401	1,470	1,304
Nonaccrual With No Allowance for Credit Loss	401
Interest Income on Nonaccrual Loans	0
Residential
Financing Receivable, Past Due [Line Items]
Total	910,501	922,921	923,719
Loans 90 or More Days Past Due and Still Accruing Interest	436	44	151
Nonaccrual Loans	2,207	3,010	2,555
Nonaccrual With No Allowance for Credit Loss	2,207
Interest Income on Nonaccrual Loans	0
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total	11,102	13,783	13,704
Financial Asset, Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total	207	293	416
Financial Asset, Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	1,641	1,658	1,481
Financial Asset, Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total	5,574	9,068	9,495
Financial Asset, Past Due | Residential
Financing Receivable, Past Due [Line Items]
Total	3,680	2,764	2,312
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	3,979	5,339	5,062
Financing Receivables, 30 to 59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total	157	102	172
Financing Receivables, 30 to 59 Days Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	0	0	0
Financing Receivables, 30 to 59 Days Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total	3,508	4,976	4,696
Financing Receivables, 30 to 59 Days Past Due | Residential
Financing Receivable, Past Due [Line Items]
Total	314	261	194
Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	3,072	4,105	3,836
Financing Receivables, 60 to 89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total	0	113	128
Financing Receivables, 60 to 89 Days Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	0	0	0
Financing Receivables, 60 to 89 Days Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total	1,610	2,713	3,227
Financing Receivables, 60 to 89 Days Past Due | Residential
Financing Receivable, Past Due [Line Items]
Total	1,462	1,279	481
Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	4,051	4,339	4,806
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total	50	78	116
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	1,641	1,658	1,481
Financing Receivables, Equal to Greater than 90 Days Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total	456	1,379	1,572
Financing Receivables, Equal to Greater than 90 Days Past Due | Residential
Financing Receivable, Past Due [Line Items]
Total	1,904	1,224	1,637
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total	2,632,980	2,581,247	2,548,211
Financial Asset, Not Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total	242,583	240,261	276,255
Financial Asset, Not Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	596,601	570,129	531,551
Financial Asset, Not Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total	886,975	850,700	818,998
Financial Asset, Not Past Due | Residential
Financing Receivable, Past Due [Line Items]
Total	$ 906,821	$ 920,157	$ 921,407