Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Unrealized losses on available-for-sale securities	$ 4,350	$ 2,084
Allowance for loan losses	8,303	8,526
Purchase accounting adjustments—loans	2,427	3,487
Reserves and other accruals	10,426	9,194
Provision for legal settlement	0	2,520
Deferred gains	458	589
Net operating losses	165	188
Derivatives	775	757
Reverse mortgages	384	606
Total deferred tax assets	27,288	27,951
Deferred tax liabilities:
Unrealized gains on equity investments	(4,203)	0
Accelerated depreciation	(806)	(778)
Other	(537)	(326)
Bank-owned life insurance	0	(5,387)
Deferred loan costs	(2,052)	(989)
Intangibles	(4,130)	(3,826)
Total deferred tax liabilities	(11,728)	(11,306)
Net deferred tax asset	$ 15,560	$ 16,645