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Loans and Allowance for Credit Losses on Loans (Loan Aging Analysis by Portfolio Segment (Including Loans Past Due Over Ninety Days and Non Accrual Loans) and Summary of Non Accrual Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income, Total	$ 3,431,474	$ 3,219,822	$ 3,095,023
Loans 90 Days Past Due and Accruing	0	0
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income, Total	1,306,447	1,054,798	1,070,374
Loans 90 Days Past Due and Accruing	0	0
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income, Total			1,243,397
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income, Total	363,695	381,494	442,701
Loans 90 Days Past Due and Accruing	0	0
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income, Total	210,403	258,573	312,779
Loans 90 Days Past Due and Accruing	0	0
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income, Total	19,516	20,392	$ 25,772
Loans 90 Days Past Due and Accruing	0	0
SBA PPP Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income, Total	35,953	135,095
Loans 90 Days Past Due and Accruing	0	0
Commercial real estate, non owner-occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income, Total	1,178,185	1,097,975
Loans 90 Days Past Due and Accruing	0	0
Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income, Total	317,275	271,495
Loans 90 Days Past Due and Accruing	0	0
30 – 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,259	2,362
30 – 59 Days Past Due | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	379	1,406
30 – 59 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	282	430
30 – 59 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	456	335
30 – 59 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	95	92
30 – 59 Days Past Due | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	47	99
60 – 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	768	1,393
60 – 89 Days Past Due | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	475	1,103
60 – 89 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	174
60 – 89 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	50	173
60 – 89 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1	67
60 – 89 Days Past Due | SBA PPP Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	68
60 – 89 Days Past Due | Commercial real estate, non owner-occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		50
90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,658	5,032
90 Days or Greater Past Due | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,210	2,535
90 Days or Greater Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	787	857
90 Days or Greater Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	445	1,416
90 Days or Greater Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	32	4
90 Days or Greater Past Due | Commercial real estate, non owner-occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	51	173
90 Days or Greater Past Due | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	133	47
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,685	8,787
Total Past Due | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,064	5,044
Total Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,243	1,287
Total Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	951	1,924
Total Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	128	163
Total Past Due | SBA PPP Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	68
Total Past Due | Commercial real estate, non owner-occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	51	223
Total Past Due | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	180	146
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,426,789	3,211,035
Current | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,304,383	1,049,754
Current | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	362,452	380,207
Current | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	209,452	256,649
Current | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	19,388	20,229
Current | SBA PPP Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	35,885	135,095
Current | Commercial real estate, non owner-occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,178,134	1,097,752
Current | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 317,095	$ 271,349

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