Loans and Allowance for Credit Losses (Aging of Past Due Financing Receivables) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 2,027	$ 3,040
Nonaccrual	3,457	5,455
Total loans	$ 1,494,897	$ 1,454,256
Percent of total loans, Total past due	0.20%	0.30%
Percent of total loans, Nonaccrual	0.20%	0.40%
Percent of total loans, Total loans	100.00%	100.00%
Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 1,489,413	$ 1,445,761
Percent of total loans, Current	99.60%	99.30%
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 784	$ 1,229
Percent of total loans, Total past due	0.10%	0.10%
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 495	$ 1,007
Percent of total loans, Total past due		0.10%
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 748	$ 804
Percent of total loans, Total past due	0.10%	0.10%
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 1,282	$ 1,747
Nonaccrual	818	1,585
Total loans	460,890	443,542
Residential Portfolio Segment [Member] | Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	458,790	440,210
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	530	517
Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	425	938
Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	327	292
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	570	879
Nonaccrual	2,116	3,287
Total loans	663,894	661,232
Commercial Real Estate Portfolio Segment [Member] | Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	661,208	657,066
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	149	367
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	421	512
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	12	294
Nonaccrual	226	258
Total loans	145,217	211,256
Commercial Portfolio Segment [Member] | Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	144,979	210,704
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		226
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	12	68
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	136	120
Nonaccrual		28
Total loans	94,306	31,466
Consumer Portfolio Segment [Member] | Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	94,170	31,318
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	105	119
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	31	1
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	27
Nonaccrual	297	297
Total loans	130,590	106,760
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	130,266	$ 106,463
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 27