Income Taxes - Tax Effects of Temporary Differences Related to Deferred Taxes Included in Other Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Deferred tax assets:
Loans acquired	$ 15,849	$ 19,885
Allowance for loan losses	13,950	10,773
Valuation of foreclosed assets	2,855	2,852
Tax NOLs from acquisition	7,629	7,821
Deferred compensation payable	2,639	2,433
Accrued equity and other compensation	6,899	5,302
Acquired securities	578	578
Unrealized loss on available-for-sale securities	13,326	6,107
Other	6,701	8,813
Gross deferred tax assets	70,426	64,564
Deferred tax liabilities:
Goodwill and other intangible amortization	(32,436)	(32,572)
Accumulated depreciation	(9,375)	(8,945)
Other	(3,325)	(4,413)
Gross deferred tax liabilities	(45,136)	(45,930)
Net deferred tax asset, included in other assets	$ 25,290	$ 18,634