Premises and Equipment (Summary of Premises and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 48,387	$ 44,109
Less accumulated depreciation	27,301	24,461
Total	21,086	19,648
Land [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	873	873
Building [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	13,087	13,079
Leaseholds and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	2,098	2,112
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	13,248	12,320
Software [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	4,704	4,614
Internally Developed Software [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 14,377	$ 11,111