Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Impaired loans with specific valuation allowances	$ 0	$ 0
Other real estate owned	0	0
MSRs	0	0
Assets, Fair Value Disclosure, Nonrecurring	0	0
Fair Value, Inputs, Level 2 [Member]
Impaired loans with specific valuation allowances	0	0
Other real estate owned	0	0
MSRs	0	0
Assets, Fair Value Disclosure, Nonrecurring	0	0
Fair Value, Inputs, Level 3 [Member]
Impaired loans with specific valuation allowances	25,279	34,383
Other real estate owned	5,684	6,552
MSRs	1,546	1,308
Assets, Fair Value Disclosure, Nonrecurring	$ 32,509	$ 42,243