Premises and Equipment (Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 74,013	$ 76,111
Accumulated depreciation and amortization	(31,140)	(30,152)
Premises and equipment, net	42,873	45,959
Gain (Loss) on Disposition of Assets	0	(1,130)	$ 0
Gain (Loss) on Disposition of Property Plant Equipment	0	0	$ 0
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,012	3,102
Buildings and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	36,958	37,926
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	34,043	35,083
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	(3,200)	(3,300)
Capitalized Computer Software, Gross	3,600	3,800
Capital Lease Obligations [Member]
Property, Plant and Equipment [Line Items]
Capital Leased Assets, Gross	$ 855	855
SBM Financial, Inc. [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Disposals		$ 1,100