Commitments, Contingencies and Concentrations of Credit Risk (Details) - Summary of Financial Instruments - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Supply Commitment [Line Items]
Off-balance sheet commitements	$ 678,137	$ 603,112
Commercial Portfolio Segment [Member] | Supply Commitment [Member]
Supply Commitment [Line Items]
Off-balance sheet commitements	344,142	267,865
Home Equity Line of Credit [Member]
Supply Commitment [Line Items]
Off-balance sheet commitements	44,483	52,788
Commercial Real Estate Portfolio Segment [Member] | Supply Commitment [Member]
Supply Commitment [Line Items]
Off-balance sheet commitements	254,710	263,395
Standby Letters of Credit [Member]
Supply Commitment [Line Items]
Off-balance sheet commitements	34,114	18,331
Overdraft Protection Lines [Member]
Supply Commitment [Line Items]
Off-balance sheet commitements	$ 688	$ 733