Fair Value Measurements - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value Measurements Disclosure [Line Items]
Percentage of securities using market-based information	100.00%
Transfer of equity security to non-marketable equity securities, included in other assets	$ 0	$ 0
Short-term borrowings approximate fair value for amounts that mature, days, less than	90 days
Fair value, measurements, nonrecurring
Fair Value Measurements Disclosure [Line Items]
Collateral dependent loans carrying value	$ 19,600,000
Collateral dependent loans, allowance for credit loss	10,000,000
Provision for fair value measurements included in allowance for loan losses	500,000
Carrying amount of OREO	1,500,000
Loss from OREO included in earnings	500,000
Other real estate valuation allowance	500,000
Fair value, measurements, nonrecurring | Mortgage Servicing Rights
Fair Value Measurements Disclosure [Line Items]
Servicing asset	10,300,000
Valuation allowance for impairment of recognized servicing assets, additions (deductions) for expenses (recoveries)	2,500,000
Fair value, measurements, nonrecurring | Mortgage Servicing Rights | Provision Expense
Fair Value Measurements Disclosure [Line Items]
Valuation allowance for impairment of recognized servicing assets, deductions for recoveries	4,800,000
Fair value, measurements, nonrecurring | SBA-Guaranteed Loan Servicing
Fair Value Measurements Disclosure [Line Items]
Servicing asset	3,200,000
Valuation allowance for impairment of recognized servicing assets, additions (deductions) for expenses (recoveries)	1,100,000
Valuation allowance for impairment of recognized servicing assets, deductions for recoveries	100,000
Minimum | Commercial Loan
Fair Value Measurements Disclosure [Line Items]
Financing receivable, individual reserves in default, threshold	1,000,000
Maximum | Commercial and Consumer Loans
Fair Value Measurements Disclosure [Line Items]
Financing receivable, individual reserves in default, threshold	$ 1,000,000