Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Allowance for credit losses	$ 31,571	$ 28,535	$ 29,208
Compensation and benefits			1,154
Security gains	1,320	1,472	1,565
Non-accrual interest income	833	848	766
Partnership adjustments	553	338
Net operating loss carryforwards	4,709	5,685	6,480
Fair value adjustments on securities available-for-sale	72,932	83,734	1,484
Lease accrual	11,178	10,410	11,399
Other	3,963	3,732	4,617
Gross deferred tax assets	127,059	134,754	56,673
Deferred tax liabilities:
Depreciation and amortization	(5,366)	(4,786)	(3,748)
Accretion on securities	(577)	(383)	(251)
Deferred fees and costs	(4,107)	(3,289)	(2,368)
Purchase accounting adjustments	(8,398)	(9,594)	(9,996)
Compensation and benefits		(47)
Partnership adjustments	(1,818)		(127)
Lease - right of use assets	(10,173)	(9,391)	(10,342)
Other	(197)	(763)	(1,144)
Gross deferred tax liabilities	(30,636)	(28,253)	(27,976)
Net deferred tax assets	$ 96,423	$ 106,501	$ 28,697