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Summary of Assets Measured at Fair Value on Non Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Observable Market Data (Level 2)
Assets:
Mortgage servicing rights	$ 813
Fair Value, Measurements, Nonrecurring
Assets:
Collateral-dependent impaired loans	8,900	18,183
Goodwill		276
Other real estate owned	596	1,682
Mortgage servicing rights	813	1,138
Fair Value, Measurements, Nonrecurring \| Observable Market Data (Level 2)
Assets:
Mortgage servicing rights	813	1,138
Fair Value, Measurements, Nonrecurring \| Company Determined Fair Value (Level 3)
Assets:
Collateral-dependent impaired loans	8,900	18,183
Goodwill		276
Other real estate owned	$ 596	$ 1,682

Fair value 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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