Outstanding Commitments and Contingent Liabilities (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Maximum	Mar. 31, 2014 Commitments to extend credit	Dec. 31, 2013 Commitments to extend credit	Mar. 31, 2014 Standby letters of credit	Dec. 31, 2013 Standby letters of credit
Credit Commitments and Contingencies
Financial instruments whose contract amounts represent credit risk				$ 587,671	$ 527,614	$ 20,331	$ 10,155
Term for guarantee			1 year
Liabilities for potential obligations under guarantees	$ 0	$ 0