Contingent Liabilities, Commitments, and Financial Instruments with Off-Balance-Sheet Risk (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information
Off-balance-sheet instruments	$ 829,509	$ 733,870
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information
Off-balance-sheet instruments	$ 37,984	$ 26,939
Minimum | Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information
Term of standby letter of credit	6 months
Maximum | Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information
Term of standby letter of credit	1 year