Derivative Financial Instruments - Additional Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Customer interest rate swaps (commerical customer counterparty):
Notional amount of assets, Net total	$ 154,099	$ 132,388
Correspondent interest rate swaps (financial institution counterparty):
Notional amount of liabilities, Net total	154,099	132,388
Customer interest rate swaps (commerical customer counterparty):
Fair Value of assets, Net total	3,159	1,553
Correspondent interest rate swaps (financial institution counterparty):
Fair Value of liabilities, Net total	$ (3,328)	$ (1,637)
Strike rate on caps	6.00	6.00
Customer
Customer interest rate swaps (commerical customer counterparty):
Notional amount of assets	$ 137,251	$ 115,459
Correspondent interest rate swaps (financial institution counterparty):
Notional amount of liabilities	16,848	16,929
Customer interest rate swaps (commerical customer counterparty):
Fair Value of assets, Assets	3,152	1,528
Correspondent interest rate swaps (financial institution counterparty):
Fair Value of liabilities, Assets	(7)	(25)
Financial Institution
Customer interest rate swaps (commerical customer counterparty):
Notional amount of assets	16,848	16,929
Correspondent interest rate swaps (financial institution counterparty):
Notional amount of liabilities	137,251	115,459
Customer interest rate swaps (commerical customer counterparty):
Fair Value of assets, Assets	7	25
Correspondent interest rate swaps (financial institution counterparty):
Fair Value of liabilities, Assets	$ (3,321)	$ (1,612)