Loans and Allowance for Loan Losses - Narrative (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) loan borrowingRelationship	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of allowance for loan losses	$ 2,056,254,000		$ 1,911,217,000
Loans greater than 90 days past due	0		0
Interest income related to non-accrual loans	$ 18,300	$ 6,800
Number of borrowing relationships, subject to deferment, CARES act | borrowingRelationship	6
Number of loans, subject to deferment, CARES act | loan	6
Loans and leases receivable, subject to deferment, CARES act	$ 12,200,000
Pledged loans	1,200,000,000		941,200,000
Total commitments and standby letters of credit	249,443,000		248,877,000
Unfunded Loan Commitment | Affiliated Entity
Financing Receivable, Past Due [Line Items]
Total commitments and standby letters of credit	8,900,000		9,700,000
FHLB of San Francisco
Financing Receivable, Past Due [Line Items]
Pledged loans	29,700,000		33,400,000
60 - 89 Days
Financing Receivable, Past Due [Line Items]
Loans between 60-89 days past due	$ 0		$ 0