Loans and Allowance for Credit Losses - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) contract	Sep. 30, 2021 USD ($) contract	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred origination fees	$ 8,000,000		$ 8,000,000		$ 11,500,000
Accrued interest on loans	4,600,000		4,600,000		5,500,000
PPP loans	1,395,284,000		1,395,284,000		1,402,147,000
Nonaccrual loans	7,092,000		7,092,000		11,650,000
Interest on nonaccrual loans reversed through interest income	0	$ 0	2,000	$ 0
Interest earned on nonaccrual loans	1,200,000	$ 419,000	2,100,000	$ 785,000
Total loans classified as TDRs	8,108,000		8,108,000		10,600,000
COVID-19 loan accommodations	8,439,000		$ 8,439,000		49,219,000
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	6,473,000		$ 6,473,000		10,672,000
Commercial & industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	3,228,000		3,228,000		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	$ 11,300,000		$ 11,300,000		$ 118,200,000