Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Tax effect of net unrealized loss on securities available for sale reflected in stockholders’ equity	$ 19,468	$ 2,730
Tax effect of net unrealized loss on derivatives reflected in stockholders’ equity	484	1,094
Securities	0	359
Allowance for loan losses	20,506	18,841
Deferred compensation	9,146	8,772
Organization and acquisitions costs	649	473
Net operating loss carryforwards	17,676	13,467
Non-accrual loan interest	752	746
OREO write-downs	1,756	1,968
Rehab tax credit projects	5,620	5,192
Mortgage repurchase obligation	333	340
Self-funded health plan	632	603
Other	1,463	1,352
Gross deferred tax assets	78,485	55,937
Valuation allowance	(9,870)	(9,050)
Gross deferred tax assets	68,615	46,887
Deferred tax liabilities:
Securities	(452)	0
Premises, furniture and equipment	(9,284)	(9,375)
Tax bad debt reserves	(13)	(18)
Purchase accounting	(3,496)	(4,498)
Prepaid expenses	(881)	(301)
Mortgage servicing rights	(13,956)	(13,441)
Deferred loan fees	(3,804)	(2,257)
Other	(379)	(414)
Gross deferred tax liabilities	(32,265)	(30,304)
Net deferred tax asset	$ 36,350	$ 16,583