Loans - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	$ 2,564,009	$ 2,364,933	$ 2,314,660
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage loans in process of foreclosure, amount	1,300
Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	758,076	628,550	606,992
Satisfactory | Commercial Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	264,094	144,283	135,355
Satisfactory | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	493,982	484,267	471,637
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	14,105	295	2,591
Special Mention | Commercial Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	1,485	32	107
Special Mention | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	12,620	263	2,484
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	44,973	32,356	30,635
Substandard | Commercial Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	10,342	6,345	6,673
Substandard | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	34,631	26,011	23,962
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	0	0	0
Doubtful | Commercial Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	0	0	0
Doubtful | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	0	0	0
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	1,770,723	1,721,068	1,691,335
Performing | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	847,967	810,535	805,147
Performing | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	922,756	910,533	886,188
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	4,578	3,851	4,038
Nonperforming | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	1,559	663	650
Nonperforming | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Net Loans	$ 3,019	$ 3,188	$ 3,388