Income Taxes - Tax Effects of Temporary Differences Related to Deferred Taxes Included in Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Loans acquired	$ 12,536	$ 19,885
Allowance for loan losses	13,947	10,773
Valuation of foreclosed assets	1,474	2,852
Tax NOLs from acquisition	7,242	7,821
Deferred compensation payable	2,707	2,433
Accrued equity and other compensation	8,182	5,302
Acquired securities	397	578
Unrealized loss on available-for-sale securities	9,196	6,107
Other	7,042	8,813
Gross deferred tax assets	62,723	64,564
Deferred tax liabilities:
Goodwill and other intangible amortization	(30,471)	(32,572)
Accumulated depreciation	(13,361)	(8,945)
Other	(5,360)	(4,413)
Gross deferred tax liabilities	(49,192)	(45,930)
Net deferred tax asset, included in other assets	$ 13,531	$ 18,634