Commitments and Contingencies - Summary of Contractual Amounts of Off-balance Sheet Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Commitments to Extend Credit [Member]
Commitments And Contingencies [Line Items]
Off-balance sheet financial instrument, contractual amount	$ 437,558	$ 382,928
Stand-by Letters of Credit and Bond Commitments [Member]
Commitments And Contingencies [Line Items]
Off-balance sheet financial instrument, contractual amount	35,767	36,333
Unused Credit Card Lines, All Unsecured [Member]
Commitments And Contingencies [Line Items]
Off-balance sheet financial instrument, contractual amount	$ 26,430	$ 25,512