Comprehensive Income and Accumulated Other Comprehensive Income - Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gain (loss) on available-for-sale securities, Pre-Tax Amount	$ (31,602)	$ (6,695)	$ 12,074
Reclassification adjustment for gains (losses) realized in net income, Pre-Tax Amount	(3,037)	(2,776)	(925)
Net unrealized gain loss, Pre-Tax Amount	(34,639)	(9,471)	11,149
Other comprehensive income (loss), Pre-Tax Amount	(34,639)	(9,471)	11,149
Unrealized gain loss on available-for-sale securities, Tax Expense (Benefit)	(6,636)	(1,406)	2,536
Reclassification adjustment for gains (losses) realized in net income, Tax Expense (Benefit)	(638)	(583)	(195)
Net unrealized gain loss, Tax Expense (Benefit)	(7,274)	(1,989)	2,341
Other comprehensive income (loss), Tax Expense (Benefit)	(7,274)	(1,989)	2,341
Unrealized gain (loss) on available-for-sale securities, Net-of-Tax Amount	(24,966)	(5,289)	9,538
Reclassification adjustment for gains (losses) realized in net income, Net-of-Tax Amount	(2,399)	(2,193)	(730)
Net unrealized gain loss, Net-of-Tax Amount	(27,365)	(7,482)	8,808
Other comprehensive income (loss), Net-of-Tax Amount	$ (27,365)	$ (7,482)	$ 8,808