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Stock Based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Apr. 27, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of option vesting rate	20.00%
Duration of options granted, years	10 years
Stock options outstanding, exercise price range, lower	$ 21.18
Stock options outstanding, exercise price range, upper	$ 48.91
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the Plan	$ 3,869,000
Weighted-average period of unrecognized compensation cost recognition, years	1 year 3 days
Total fair value of shares vested	$ 10,000	$ 26,000
Stock compensation expense	753,000	669,000
Dividends Payable	27,252,000		$ 27,223,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance measurement amount in assets	50,000,000,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance measurement amount in assets	$ 10,000,000,000
Two Thousand Twenty One Omnibus Stock and Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of stock for issuance under the plan	943,610			2,500,000
2021 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of option vesting rate	20.00%
Other Liabilities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends Payable	$ 179,000		$ 199,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of shares vested	1,281,000	847,000
Restricted Stock [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 210,000	193,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares vesting period	2 years
Percentage of option vesting rate	20.00%
Performance share [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of option vesting rate	33.30%
Performance share [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Issued Upon Vesting Based On Core Return Percentage	200.00%
Performance share [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Issued Upon Vesting Based On Core Return Percentage	0.00%
Performance share [Member] \| Executives And Other Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares vesting period	3 years
Criteria period	3 years
Average adjusted earnings per share growth percentage	50.00%
Return on average assets	100.00%
Performance share [Member] \| Executives And Other Officers [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Issued Upon Vesting Based On Core Return Percentage	200.00%
Performance share [Member] \| Executives And Other Officers [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Issued Upon Vesting Based On Core Return Percentage	0.00%
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of option vesting rate	33.30%
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the Plan	$ 4,894,000
Weighted-average period of unrecognized compensation cost recognition, years	1 year 29 days
Restricted Stock Units [Member] \| Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 939,000	$ 1,066,000