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Capitalized Mortgage Servicing rights (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Participating Mortgage Loans [Line Items]
Balance, January 1	$ 4,777	$ 6,087
Additions	637	490
Amortized to expense	(708)	(959)
Change in valuation allowance	152	(12)
Balance, March 31	$ 4,858	$ 5,606

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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- Definition

The net increase (decrease) in the valuation allowance for servicing assets subsequently measured using the amortization method.

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