Summary of Premises and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 43,404	$ 43,030
Less accumulated depreciation and amortization	(17,805)	(17,002)
Property, plant and equipment, net	25,599	26,028
Land
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	3,979	3,979
Building Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	15,972	15,972
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	19,499	19,280
Furniture, Fixtures and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 3,954	$ 3,799