Loans and Allowance for Credit Losses - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) contract	Jun. 30, 2021 USD ($) contract	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred origination fees	$ 8,300,000		$ 8,300,000		$ 11,500,000
Accrued interest on loans	5,300,000		5,300,000		5,500,000
PPP loans	1,394,172,000		1,394,172,000		1,402,147,000
Nonaccrual loans	8,001,000		8,001,000		11,650,000
Interest on nonaccrual loans reversed through interest income	0	$ 0	2,000	$ 0
Interest earned on nonaccrual loans	873,000	$ 232,000	930,000	$ 366,000
Total loans classified as TDRs	8,900,000		$ 8,900,000		10,600,000
Number of restructured loans | contract			0
Commitment to extend additional credit for loans classified as TDRs	0		$ 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	7,318,000		$ 7,318,000		10,672,000
Commercial & industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	3,496,000		3,496,000		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	$ 31,900,000		$ 31,900,000		$ 118,200,000