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Loan Servicing - Activity for Mortgage Servicing Rights and Related Valuation Allowance (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Servicing rights, net of valuation allowance:
Beginning of year	$ 37	$ 57	$ 88
Additions			1
Amortized to expense	(9)	(23)	(31)
Change in valuation allowance	1	3	(1)
End of year	29	37	57
Valuation allowance:
Beginning of year	2	5	4
Additions expensed			1
Reductions credited to operations	(1)	(3)
End of year	$ 1	$ 2	$ 5

X

- Definition

Amortized carrying amount (balance) as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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The value of new servicing assets, subsequently measured at amortized value, acquired or created during the current period through purchases or from transfers of financial assets.

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Amount of expense charged against earnings for the periodic recognition of servicing assets relative to estimated net servicing income.

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Amount of other increase (decrease) of servicing assets amortized for changes other than additions, disposals, amortization, application of any valuation allowance, and other than temporary impairments (OTTI).

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Reflects the estimated amount of impairment as of the balance sheet date of recognized servicing assets that are being amortized in proportion to and over the period of estimated net servicing income or loss.

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