Non-performing Loans and Impaired Loans - Additional Information (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) consecutivePayment	Dec. 31, 2019 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Non-accrual loans	$ 18,281,000	$ 15,679,000
Non-performing TDRs	$ 3,400,000
Restructured loan returned to accruing status number of Consecutive Payments of loan | consecutivePayment	6
Restructured loan reported in TDRs	$ 5,475,000	5,360,000
Specific reserves allocated to troubled debt restructuring	435,000
TDR loans	3,360,000	2,006,000
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Non-accrual loans	7,017,000	4,782,000
Restructured loan reported in TDRs	2,551,000	2,565,000
TDR loans	2,412,000	1,081,000
Commercial | Owner occupied real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Non-accrual loans	5,512,000	2,424,000
Restructured loan reported in TDRs	768,000	768,000
Non-accrual loans	18,300,000	15,700,000
TDR loans	629,000	$ 629,000
CARES Act
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loan reported in TDRs	56,600,000
Performing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loan reported in TDRs	$ 3,400,000
Number TDRs returned to accrual status | consecutivePayment	1
Loans Purchased With Evidence of Credit Deterioration
Financing Receivable, Troubled Debt Restructuring [Line Items]
Non-accrual loans	$ 3,500,000
Non-performing TDRs	101,000
Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans with an aggregate credit exposure	$ 1,000,000
Loans classified as TDR after a period	90 days
Minimum | Good Pass
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of consecutive years of profit Unaudited Financial Information for Good Pass Rating	5 years
Number of years of Satisfactory Relationship with bank for Good Pass Rating	5 years
Minimum | Satisfactory Pass
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of consecutive years of profit for Good Pass Rating	3 years
Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans with an aggregate credit exposure	$ 3,500,000
Loans classified as TDR after a period	120 days
Minimum number of years of Satisfactory Repayment required for Satisfactory Pass Rating	2 years