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Loans and Allowance for Credit Losses - Schedule of Collateral-Dependent Non-Accrual Loans (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	$ 19,958,000	$ 22,874,000
Weighted average ratio of loans value to collateral dependent loans value	59.20%	59.20%
Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	$ 9,204,000	$ 9,233,000
Allowance for credit losses	0	0
Nonaccrual collateral dependent loans in process of foreclosure	0	0
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	8,750,000	8,757,000
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	454,000	459,000
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	0	17,000
Commercial real estate loans | Commercial owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	2,304,000	2,778,000
Commercial real estate loans | Commercial owner-occupied | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	7,147,000	7,147,000
Allowance for credit losses	0	0
Commercial real estate loans | Commercial owner-occupied | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	7,147,000	7,147,000
Commercial real estate loans | Commercial owner-occupied | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	0	0
Commercial real estate loans | Commercial owner-occupied | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	0	0
Commercial real estate loans | Commercial investor-owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	10,856,000	12,682,000
Commercial real estate loans | Commercial investor-owned | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	1,603,000	1,610,000
Allowance for credit losses	0	0
Commercial real estate loans | Commercial investor-owned | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	1,603,000	1,610,000
Commercial real estate loans | Commercial investor-owned | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	0	0
Commercial real estate loans | Commercial investor-owned | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	0	0
Residential loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	520,000	738,000
Residential loans | Home equity | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	454,000	459,000
Allowance for credit losses	0	0
Residential loans | Home equity | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	0	0
Residential loans | Home equity | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	454,000	459,000
Residential loans | Home equity | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	0	0
Consumer loans | Installment and other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	$ 255,000	291,000
Consumer loans | Installment and other consumer loans | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual		17,000
Allowance for credit losses		0
Consumer loans | Installment and other consumer loans | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual		0
Consumer loans | Installment and other consumer loans | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual		0
Consumer loans | Installment and other consumer loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual		$ 17,000

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