Premises and Equipment - Schedule of Future Minimum Rental Payments for Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Abstract]
Rent expense	$ 2,812	$ 2,636	$ 2,801
2013	2,284
2014	2,025
2015	1,852
2016	1,441
2017	865
After 2017	1,428
Total Future Minimum Obligations	$ 9,895