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Mortgage Banking Activities (Details2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Valuation allowance for mortgage servicing rights
Balance, beginning of year	$ (1,785)	$ (285)	$ (423)
Impairment charges	(1,179)	(1,727)	(1,279)
Recoveries	2,284	227	1,417
Balance, end of year	$ (680)	$ (1,785)	$ (285)

The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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