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Mortgage-Servicing Rights (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Servicing Assets at Fair Value [Line Items]
Beginning balance, gross	$ 3,101	$ 3,674	$ 3,984
Servicing rights capitalized	294	430	682
Amortization of servicing rights	(999)	(1,003)	(992)
Ending balance, gross	2,396	3,101	3,674
Valuation allowance	(665)	(475)	(325)	(500)
Ending balance, net	$ 1,731	$ 2,626	$ 3,349

The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. 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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