Allowance for Credit Losses (Collateral Dependent Loans) (Details)	Sep. 30, 2020 USD ($)
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	54,180,000
Net Realizable Value of Collateral	$ 79,791,000
Collateral Coverage	147.30%
Allowance for Credit Losses	$ 162,000
Collateral-dependent nonaccrual loans with no allowance	52,000,000.0
Non-PCD Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	37,071,000
Net Realizable Value of Collateral	$ 54,348,000
Collateral Coverage	146.60%
Allowance for Credit Losses	$ 162,000
Non-PCD Loans | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	13,957,000
Net Realizable Value of Collateral	$ 22,254,000
Collateral Coverage	159.40%
Allowance for Credit Losses	$ 0
Non-PCD Loans | Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	23,114,000
Net Realizable Value of Collateral	$ 32,094,000
Collateral Coverage	138.90%
Allowance for Credit Losses	$ 162,000
PCD Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	17,109,000
Net Realizable Value of Collateral	$ 25,443,000
Collateral Coverage	148.70%
Allowance for Credit Losses	$ 0
Construction and land development | Non-PCD Loans | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	1,425,000
Net Realizable Value of Collateral	$ 1,952,000
Collateral Coverage	137.00%
Allowance for Credit Losses	$ 0
Owner occupied commercial mortgage | Non-PCD Loans | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	5,411,000
Net Realizable Value of Collateral	$ 9,428,000
Collateral Coverage	174.20%
Allowance for Credit Losses	$ 0
Non-owner occupied commercial mortgage | Non-PCD Loans | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	7,121,000
Net Realizable Value of Collateral	$ 10,874,000
Collateral Coverage	152.70%
Allowance for Credit Losses	$ 0
Residential mortgage | Non-PCD Loans | Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	22,804,000
Net Realizable Value of Collateral	$ 31,779,000
Collateral Coverage	139.40%
Allowance for Credit Losses	$ 162,000
Revolving mortgage | Non-PCD Loans | Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-Dependant Loans	310,000
Net Realizable Value of Collateral	$ 315,000
Collateral Coverage	101.60%
Allowance for Credit Losses	$ 0