Loans and Allowance for Credit Losses - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) loan	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) loan	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred origination fees	$ 8,300,000		$ 8,300,000		$ 8,600,000
Accrued interest on loans	8,000,000		8,000,000		5,500,000
PPP loans	1,703,600,000		1,703,600,000		1,487,947,000
Loan held for investment increase			(2,700,000)
Nonaccrual loans	6,492,000		6,492,000		7,076,000
Interest on nonaccrual loans reversed through interest income	0	$ 0	0	$ 2,000
Interest earned on nonaccrual loans	200,000	$ 1,200,000	584,000	$ 2,100,000
Financing receivable, modified	2,044,000		2,044,000		5,100,000
Modified outstanding commitments	$ 0		$ 0
COVID-19 Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modified					$ 999,000
Number of modifications | loan	0		0		1
Net of government guarantees
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 5,037,000		$ 5,037,000		$ 6,430,000
Commercial & industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	4,254,000		4,254,000		3,294,000
Commercial & industrial loans | Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
PPP loans	$ 3,200,000		$ 3,200,000		$ 7,100,000