Summary of Significant Accounting Policies - Additional Information (Details)		12 Months Ended
	May 24, 2021 USD ($)	Dec. 31, 2021 USD ($) branch	Dec. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Number of full service branches | branch		9
Loans		$ 1,297,896,000	$ 1,084,384,000
Servicing assets		12,720,000	7,360,000
Accrued interest receivable		4,579,000	3,985,000
Loans receivable, allowance		16,123,000	15,352,000		$ 10,050,000	$ 9,636,000
Interest and/or penalties related to income tax matters		$ 0	$ 0
Hana Small Business Lending Inc
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Payments to purchase loan portfolio	$ 97,631,000
Loans	100,003,000
Fair value discount of loans	8,867,000
Servicing assets	6,097,000
Accrued interest receivable	$ 398,000
Hana Small Business Lending Inc | Purchased Performing Loans
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Loans receivable, allowance				$ 0
Equipment and Furnishings | Minimum
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Equipment and furnishings, useful lives		3 years
Equipment and Furnishings | Maximum
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Equipment and furnishings, useful lives		10 years
Open Bank
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Percentage of voting equity interests acquired		100.00%