Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	$ 5,388	$ 19,197
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	5,388	19,491
Specific valuation allowance	95	3,223
Loans with a Specific Valuation Allowance, Average Balance	10,378	19,519
Loans without a Specific Valuation Allowance, Recorded Balance	89,116	89,591
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	99,355	107,486
Loans without a Specific Valuation Allowance, Average Balance	93,338	106,747
Recorded balance	94,504	108,788
Unpaid principal balance	104,743	126,977
Average balance	103,716	126,266
Residential Real Estate | Residential Real Estate
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	0	1,957
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	0	2,220
Specific valuation allowance	0	83
Loans with a Specific Valuation Allowance, Average Balance	409	2,686
Loans without a Specific Valuation Allowance, Recorded Balance	7,804	10,728
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	9,220	11,989
Loans without a Specific Valuation Allowance, Average Balance	9,879	10,269
Recorded balance	7,804	12,685
Unpaid principal balance	9,220	14,209
Average balance	10,288	12,955
Commercial | Commercial Real Estate
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	5,343	9,345
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	5,343	9,345
Specific valuation allowance	73	568
Loans with a Specific Valuation Allowance, Average Balance	6,341	8,498
Loans without a Specific Valuation Allowance, Recorded Balance	53,266	59,492
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	57,735	71,300
Loans without a Specific Valuation Allowance, Average Balance	59,107	73,889
Recorded balance	58,609	68,837
Unpaid principal balance	63,078	80,645
Average balance	65,448	82,387
Commercial | Other Commercial
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	10	7,268
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	10	7,268
Specific valuation allowance	10	2,313
Loans with a Specific Valuation Allowance, Average Balance	3,490	7,081
Loans without a Specific Valuation Allowance, Recorded Balance	21,465	13,707
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	24,758	17,689
Loans without a Specific Valuation Allowance, Average Balance	18,079	17,376
Recorded balance	21,475	20,975
Unpaid principal balance	24,768	24,957
Average balance	21,569	24,457
Consumer and Other | Home Equity
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	0	120
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	0	120
Specific valuation allowance	0	39
Loans with a Specific Valuation Allowance, Average Balance	24	82
Loans without a Specific Valuation Allowance, Recorded Balance	3,745	3,377
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	4,494	3,986
Loans without a Specific Valuation Allowance, Average Balance	3,486	3,465
Recorded balance	3,745	3,497
Unpaid principal balance	4,494	4,106
Average balance	3,510	3,547
Consumer and Other | Other Consumer
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	35	507
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	35	538
Specific valuation allowance	12	220
Loans with a Specific Valuation Allowance, Average Balance	114	1,172
Loans without a Specific Valuation Allowance, Recorded Balance	2,836	2,287
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	3,148	2,522
Loans without a Specific Valuation Allowance, Average Balance	2,787	1,748
Recorded balance	2,871	2,794
Unpaid principal balance	3,183	3,060
Average balance	$ 2,901	$ 2,920