Loans and Allowance for Credit Losses - Narrative (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) contract commitment	Mar. 31, 2021 USD ($) contract	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred origination fees	$ 9,400,000		$ 11,500,000
Accrued interest on loans	5,400,000		5,500,000
PPP loans	1,366,077,000		1,402,147,000
Nonaccrual loans	9,609,000		11,650,000
Interest on nonaccrual loans reversed through interest income	2,000	$ 0
Interest earned on nonaccrual loans	57,000	$ 134,000
Total loans classified as TDRs	$ 10,000,000		10,600,000
Number of restructured loans | contract	0	0
Number of commitments on TDR | commitment	0
Charge offs on loans later classified as TDRs	$ 0
Number of loans that defaulted that were restructured in the previous twelve months | contract	0	0
Net of government guarantees
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 8,702,000		10,672,000
Commercial & industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	4,014,000		4,350,000
Commercial & industrial loans | Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
PPP loans	$ 64,300,000		$ 118,200,000