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Components Of Net Loan Servicing Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Mortgage Servicing Rights [Line Items]
Loan servicing income	$ 2,181	$ 2,828	$ 3,076
Amortization of MSRs	(3,290)	(2,817)	(3,268)
Net loan servicing income	$ (1,109)	$ 11	$ (192)

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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