Income Taxes - Components of Net Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets
Allowance for loan and lease losses	$ 14,616	$ 10,449
Net unrealized losses on securities	0	7,639
Net operating losses	1,494	1,212
Compensation and benefits	5,839	6,234
Cash flow hedge	5,557	324
Section 197 intangibles	1,196	923
Deferred income	1,182	640
Lease liability	5,523
Other	1,307	2,766
Total gross deferred tax assets	36,714	30,187
Less: valuation allowance	(486)	0
Net deferred tax assets	36,228	30,187
Deferred tax liabilities
Fair value adjustments on acquisitions	(506)	(569)
Bank premises and equipment	(6,074)	(884)
Tax qualified lease adjustments	(30,496)	(17,786)
Right of use asset	(5,232)
Net unrealized gains on securities	(5,020)	0
Other	(640)	(746)
Total deferred tax liabilities	(47,968)	(19,985)
Net deferred tax asset/(liability)	$ (11,740)
Net deferred tax asset/(liability)		$ 10,202