Loans and Allowance for Credit Losses - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, unamortized loan fee	$ 8,600,000	$ 8,600,000
Accrued interest on loans	$ 7,400,000	$ 5,500,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
PPP loans	$ 1,772,227,000	$ 1,487,947,000
Loans secured by real estate (as a percent)	72.00%
Loans unsecured (as a percent)	4.00%
Loans secured for general commercial uses (as a percent)	24.00%
Allowance for credit losses	$ 17,270,000	$ 13,838,000	$ 11,739,000
Percentage of portfolio loans (as a percent)	0.0097	0.0092
Percentage of portfolio loans, net of government guarantees (as a percent)	0.0102	0.0099
Nonaccrual loans	$ 6,069,000	$ 7,076,000
Interest income which would have been earned on nonaccrual loans	499,000	434,000	744,000
Interest on nonaccrual loans reversed through interest income	8,000	10,000
Interest earned on nonaccrual loans	656,000	2,200,000	1,600,000
Unfunded loan commitments	120,000	110,000
Loans	1,789,497,000	1,501,785,000
Modified outstanding commitments	0
Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	44,300,000
Net of government guarantees
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	5,002,000	6,430,000
Commercial & industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	3,438,000	2,914,000	$ 3,027,000
Nonaccrual loans	3,655,000	3,294,000
Loans	411,387,000	358,128,000
Commercial & industrial loans | PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
PPP loans	$ 2,800,000	$ 7,100,000