Borrowing Arrangements - Additional Information (Detail) - USD ($)				12 Months Ended
	Aug. 17, 2021	Apr. 17, 2021	Apr. 30, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2019
Short-term Debt [Line Items]
FHLB Advance, Collateral Pledged				$ 386,100,000	$ 184,100,000
FHLB Advance, Available Borrowing Capacity				335,100,000	88,100,000
FHLB Advance, Amount Of Advances				0	50,000,000
FHLB Advance, Interest Rate								0.18%
Junior Subordinated debt securities				$ 54,152,000	54,028,000
Federal Home Loan Ten Million Outstanding [Member]
Short-term Debt [Line Items]
Federal home loan banks term borrowings outstanding					50,000,000
Junior Subordinated Debt [Member]
Short-term Debt [Line Items]
Debt Instrument, IssuanceDate				Sep. 30, 2020
Debt Instrument, Interest Rate Terms				The subordinated debt has a fixed interest rate of 5.00% for the first 5 years
SOFR [Member] | Junior Subordinated Debt [Member]
Short-term Debt [Line Items]
Debt Instrument, Variable Interest Rate Basis				variable rate equal to then current three-month term SOFR plus 0.488%
Debt Instrument, Variable Rate				0.488%
Debt Instrument, Face Amount							$ 20,000,000
Debt Instrument, Fixed Interest Rate							5.00%
Related issuance costs				$ 300,000
Junior Subordinated debt securities				20,000,000	20,000,000
SOFR [Member] | Additional Junior Subordinated Debt [Member]
Short-term Debt [Line Items]
Debt Instrument, Variable Interest Rate Basis	variable rate equal to then current three-month term SOFR plus 0.286%
Debt Instrument, Face Amount		$ 35,000,000
Debt Instrument, Interest Rate Terms		The subordinated debt has a fixed interest rate of 3.50%
Related issuance costs		$ 760,000
Junior Subordinated debt securities				35,000,000	35,000,000
Debt Instrument, Maturity Date		Sep. 01, 2031
Correspondent Banks [Member]
Short-term Debt [Line Items]
Borrowings outstanding				0	0
Line Of Credit Maximum Borrowing Capacity				123,000,000
Secured Debt [Member]
Short-term Debt [Line Items]
Borrowings outstanding				0	0
Line Of Credit Maximum Borrowing Capacity				$ 12,000,000
Line of Credit Facility, Expiration Period				3 years
Line Of Credit, Fixed Interest Rate				3.95%
Secured Debt [Member] | Federal Reserve Bank of San Francisco [Member]
Short-term Debt [Line Items]
Loans Pledged As Collateral					317,800,000
Line Of Credit Available Borrowing Capacity					218,900,000
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Borrowings outstanding				$ 0	0
Line Of Credit Maximum Borrowing Capacity				$ 3,000,000
Revolving Credit Facility [Member] | One Year Prime Rate [Member]
Short-term Debt [Line Items]
Debt Instrument, Variable Interest Rate Basis				six month term at a rate of Prime plus 0.40%
Debt Instrument, Variable Rate				0.40%
Paycheck Protection Liquidity Facility [Member]
Short-term Debt [Line Items]
Borrowings outstanding				$ 484,100,000	$ 56,400,000	$ 393,000,000
Line Of Credit Maximum Borrowing Capacity			$ 332,700,000
Line of Credit Facility, Expiration Period			2 years
Line Of Credit, Fixed Interest Rate			0.35%