Loans and Allowance for Credit Losses (Aging of Past Due Financing Receivables) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 1,850	$ 3,040
Nonaccrual	3,947	5,455
Total loans	$ 1,472,429	$ 1,454,256
Percent of total loans, Total past due	0.20%	0.30%
Percent of total loans, Nonaccrual	0.30%	0.40%
Percent of total loans, Total loans	100.00%	100.00%
Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 1,466,632	$ 1,445,761
Percent of total loans, Current	99.50%	99.30%
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 927	$ 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	$ 171	$ 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	$ 752	$ 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	$ 923	$ 1,747
Nonaccrual	1,239	1,585
Total loans	449,867	443,542
Residential Portfolio Segment [Member] | Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	447,705	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	593	517
Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		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	330	292
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	594	879
Nonaccrual	2,174	3,287
Total loans	655,252	661,232
Commercial Real Estate Portfolio Segment [Member] | Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	652,484	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	172	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	422	512
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	177	294
Nonaccrual	237	258
Total loans	186,162	211,256
Commercial Portfolio Segment [Member] | Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	185,748	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	36	226
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	141	68
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	126	120
Nonaccrual		28
Total loans	64,388	31,466
Consumer Portfolio Segment [Member] | Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	64,262	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	126	119
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		1
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	30
Nonaccrual	297	297
Total loans	116,760	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	116,433	$ 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	$ 30