Loans and Allowance for Loan Losses (Narrative) (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) loan contract segment property	Dec. 31, 2019 USD ($) property
Financing Receivable, Modifications [Line Items]
Number of loan portfolio segments | segment	5
Nonaccrual restructured loans	$ 5,633,000	$ 2,743,000
Number of loans modified as troubled debt restructurings with subsequent default | contract	0
Allowance for loan losses	$ 18,300,000	10,200,000
Commitments to extend credit	476,841,000	384,411,000
Loans	$ 2,382,243,000	$ 1,897,392,000
Number of properties in other real estate owned | property	1	1
Provision charged to expense	$ 8,683,000	$ 2,599,000
Increase (decrease) provision for loan expensed	$ 6,100,000
Allowance for loan losses basis points	1.25%	1.00%
Finance receivable increase (decrease) in reserve	$ 8,300,000
Percentage of allowance for credit losses to aggregate loans	0.77%	0.54%
Mortgage loans in process of foreclosure	$ 26,000	$ 215,000
Financing Receivable Paycheck Protection Program Cares Act [Member]
Financing Receivable, Modifications [Line Items]
Number of loans related to payroll protection program | contract	2,863
Loans	$ 288,900,000
Loan origination fee income	11,000,000.0
Loan interest income	5,900,000
Financing Receivable Cares Act [Member]
Financing Receivable, Modifications [Line Items]
Loan modification, amount	$ 17,200,000
Aggregate loans outstanding percentage	0.70%
Related Party [Member]
Financing Receivable, Modifications [Line Items]
Commitments to extend credit	$ 6,200,000
Trouble Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring	257,000	61,000
Nonaccrual restructured loans	0	0
Purchased Credit Impaired Loans [Member]
Financing Receivable, Modifications [Line Items]
Allowance for loan losses	309,000	$ 156,000
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Mortgage loans in process of foreclosure	$ 384,000
Mortgage loans in process of foreclosure number of loans	5	0