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Mortgage-Banking Activities - Summary of Activity in Valuation Allowance for Impairment of Mortgage-Servicing Rights (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Valuation allowance, beginning of period	$ 40	$ 38	$ 39	$ 39
Additions charged to operations	1	2	2	1
Valuation allowance, end of period	$ 41	$ 40	$ 41	$ 40

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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