Income Taxes Deferred tax assets (liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Accrued expenses	$ 1,717	$ 1,802	$ 891
Net operating loss	5,192	2,703	3,353
Allowance for loan losses, net of bad debt charge-offs	6,252	5,158	3,336
Deferred compensation	2,547	1,750	1,896
State taxes	1,451	1,238	858
Depreciation	651	321	(216)
Other-than-temporary impairment	0	0	684
Stock based compensation	639	313	273
Total deferred tax assets	18,449	13,285	11,075
Deferred tax liabilities:
Deferred FDIC gain	(1,656)	(1,731)	(1,944)
Core deposit intangibles	(2,266)	(1,518)	(1,813)
Unrealized (gain) loss on available for sale securities	(231)	(362)	2,160
Other	(2,785)	(291)	(1,001)
Total deferred tax liabilities	(6,938)	(3,902)	(2,598)
Net deferred tax asset	$ 11,511	$ 9,383	$ 8,477