Loans and Allowance for Credit Losses - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) contract commitment	Dec. 31, 2020 USD ($) contract	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred origination fees	$ 11,500,000	$ 11,735,000
Premiums (discounts) associated with acquired loans	0	(47,000)
Accrued interest on loans	5,500,000	7,100,000
PPP loans	$ 1,402,147,000	1,422,914,000
Loans secured by real estate	75.00%
Loans unsecured	1.00%
Loans secured for general commercial uses	24.00%
Allowance for credit losses	$ 11,739,000	21,136,000	$ 19,088,000
Nonaccrual loans	11,650,000	11,120,000
Interest income which would have been earned on nonaccrual loans	744,000	856,000	1,300,000
Interest on nonaccrual loans reversed through interest income	10,000	12,000
Interest earned on nonaccrual loans	1,600,000	924,000	301,000
Loans classified as troubled debt restructuring	$ 10,638,000	7,900,000
Number of commitments on TDR | commitment	0
Charge offs on loans later classified as TDRs	$ 0	$ 0
Number of TDRs that defaulted within twelve months of restructure | contract	0	0
Unfunded loan commitments	$ 115,000	$ 15,000
Loans pledged as collateral	0	0
Net of government guarantees
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	10,672,000	9,637,000
Commercial & industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	3,027,000	7,973,000	$ 6,604,000
Nonaccrual loans	4,350,000	3,848,000
Commercial & industrial loans | PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
PPP loans	$ 118,200,000	$ 304,600,000