Premises and Equipment - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 4,966	$ 4,739	$ 3,465
Lease expiration year	Jan. 01, 2054
Rental expense	$ 4,100	$ 3,900	$ 2,700
Two Directors
Property, Plant and Equipment [Line Items]
Rental expense for premises leases with two directors	$ 300