Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax asset:
NOL and credit carryforward	$ 18,061	$ 42,837
Allowance for credit losses	38,384	38,571
Deferred compensation	6,807	5,482
Basis difference in acquired assets and liabilities	8,967	9,228
OREO	1,234	32
Other	46,259	19,395
Gross deferred tax assets	119,712	115,545
Deferred tax liability:
Unrealized gains on loans and securities	(64,535)	(98,807)
Premises and equipment	(7,941)	(10,626)
Acquisition intangibles	(11,789)	(9,757)
Deferred loan costs	(6,834)	(5,814)
Basis difference in acquired assets and liabilities	(12,488)	(17,628)
Lease receivable	(79,795)	(37,844)
Other	(38,449)	(6,485)
Gross deferred tax liabilities	(221,831)	(186,961)
Net deferred tax liability	$ (102,119)	$ (71,416)