Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Financing Receivable, Nonaccrual [Line Items]
Number of operating segments | segment	1
Number of reportable segments | segment	1
Debt securities, non-accrual status, past due payment period	30 days
Debt securities, accrual status, sustained interest payment period	6 months
Debt securities, accrued interest after allowance for credit loss	$ 8,100,000	$ 8,700,000
Principal and interest default period	90 days
Residential mortgage loans are placed on non-accrual status at the time principal and interest period	90 days
Period of principal and interest payments in arrears for open-end consumer loans are reviewed for charge-off	4 months
Non-accrual asset satisfactory payments period	6 months
Amount of loans sold that are being serviced for others	$ 32,500,000	31,700,000
Originated mortgage servicing rights	144,000	149,000
Goodwill	271,829,000	271,829,000
Bank owned life insurance	159,862,000	156,985,000
Income on bank owned life insurance	3,450,000	3,980,000	$ 2,676,000
Bank owned life insurance, gain on death benefit	220,000	$ 855,000	$ 126,000
Company's liability to trusts including investments	$ 48,000,000
Percentage of capital permitted for trust preferred securities	25.00%
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Non-owner occupied commercial
Financing Receivable, Nonaccrual [Line Items]
Financing receivable contract term	10 years
Financing receivable, amortization schedule term	25 years
Owner occupied commercial
Financing Receivable, Nonaccrual [Line Items]
Financing receivable contract term	10 years
Financing receivable, amortization schedule term	25 years
Multifamily
Financing Receivable, Nonaccrual [Line Items]
Financing receivable contract term	10 years
Financing receivable, amortization schedule term	30 years
Non-owner occupied residential
Financing Receivable, Nonaccrual [Line Items]
Financing receivable contract term	10 years
Financing receivable, amortization schedule term	25 years
Commercial, industrial and other | Minimum
Financing Receivable, Nonaccrual [Line Items]
Financing receivable contract term	1 year
Commercial, industrial and other | Maximum
Financing Receivable, Nonaccrual [Line Items]
Financing receivable contract term	7 years
Construction | Minimum
Financing Receivable, Nonaccrual [Line Items]
Financing receivable contract term	1 year
Construction | Maximum
Financing Receivable, Nonaccrual [Line Items]
Financing receivable contract term	3 years
Equipment finance | Minimum
Financing Receivable, Nonaccrual [Line Items]
Financing receivable contract term	3 years
Equipment finance | Maximum
Financing Receivable, Nonaccrual [Line Items]
Financing receivable contract term	5 years
Residential mortgage | Minimum
Financing Receivable, Nonaccrual [Line Items]
Financing receivable contract term	15 years
Residential mortgage | Maximum
Financing Receivable, Nonaccrual [Line Items]
Financing receivable contract term	30 years