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Goodwill and Other Intangible Assets - Mortgage Servicing Rights - Summary of Balance Changes (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Changes in mortgage servicing rights balance
Beginning of period	$ 4,870
Amortization of Intangible Assets	(2,400)	(1,600)	(1,500)
End of period	6,456	4,870
Mortgage servicing rights [Member]
Changes in mortgage servicing rights balance
Beginning of period	2,739	2,441	1,437
Servicing rights capitalized	2,727	1,555	1,380
Amortization of Intangible Assets	(1,610)	(665)	(425)
Changes in valuation allowance	296	(592)	49
End of period	4,152	2,739	2,441
Mortgage loans serviced for others	$ 604,801	$ 418,224	$ 306,403

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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