Loans and Allowance for Credit Losses - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred origination fees	$ 8,700,000		$ 8,700,000		$ 8,600,000
Accrued interest on loans	9,000,000.0		9,000,000.0		7,400,000
PPP loans	1,988,037,000		1,988,037,000		1,772,227,000
Nonaccrual loans	4,944,000		4,944,000		6,069,000
Interest on nonaccrual loans reversed through interest income	0	$ 0	0	$ 0
Interest earned on nonaccrual loans	11,000	200,000	245,000	584,000
Total modifications	567,000	$ 2,044,000	4,853,000	5,540,000
Modified outstanding commitments	0		0
Net of government guarantees
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	4,944,000		4,944,000		5,002,000
Commercial & industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	2,338,000		2,338,000		3,655,000
Total modifications	195,000		4,481,000	$ 3,496,000
Commercial & industrial loans | Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
PPP loans	$ 1,200,000		$ 1,200,000		$ 2,800,000