Allowance for Credit Losses (Collateral Dependent Loans) (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Threshold balance for collateral-dependent loans to be individually reviewed for impairment	$ 500,000
Collateral-Dependant Loans	64,566,000	$ 58,825,000
Net Realizable Value of Collateral	$ 94,459,000	$ 81,272,000
Collateral Coverage	146.30%	138.20%
Allowance for Credit Losses	$ 120,000	$ 131,000
Collateral-dependent nonaccrual loans with no allowance	61,700,000	57,500,000
Non-PCD Loans | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	21,517,000	16,772,000
Net Realizable Value of Collateral	$ 30,440,000	$ 23,625,000
Collateral Coverage	141.50%	140.90%
Allowance for Credit Losses	$ 0	$ 0
Non-PCD Loans | Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	22,688,000
Net Realizable Value of Collateral	$ 29,003,000
Collateral Coverage	127.80%
Allowance for Credit Losses	$ 120,000
PCD Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	20,361,000	19,042,000
Net Realizable Value of Collateral	$ 35,016,000	$ 27,872,000
Collateral Coverage	172.00%	146.40%
Allowance for Credit Losses	$ 0	$ 0
Construction and land development | Non-PCD Loans | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	1,424,000	1,424,000
Net Realizable Value of Collateral	$ 1,795,000	$ 1,795,000
Collateral Coverage	126.10%	126.10%
Allowance for Credit Losses	$ 0	$ 0
Owner occupied commercial mortgage | Non-PCD Loans | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	11,886,000	9,792,000
Net Realizable Value of Collateral	$ 16,417,000	$ 14,253,000
Collateral Coverage	138.10%	145.60%
Allowance for Credit Losses	$ 0	$ 0
Non-owner occupied commercial mortgage | Non-PCD Loans | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	6,951,000	5,556,000
Net Realizable Value of Collateral	$ 9,312,000	$ 7,577,000
Collateral Coverage	134.00%	136.40%
Allowance for Credit Losses	$ 0	$ 0
Commercial and industrial | Non-PCD Loans | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	1,256,000
Net Realizable Value of Collateral	$ 2,916,000
Collateral Coverage	232.20%
Allowance for Credit Losses	$ 0
Residential mortgage | Non-PCD Loans | Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	21,303,000	23,011,000
Net Realizable Value of Collateral	$ 27,279,000	$ 29,775,000
Collateral Coverage	128.10%	129.40%
Allowance for Credit Losses	$ 120,000	$ 131,000
Revolving mortgage | Non-PCD Loans | Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	1,385,000
Net Realizable Value of Collateral	$ 1,724,000
Collateral Coverage	124.50%
Allowance for Credit Losses	$ 0