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Residential Mortgage-Banking Activities - Summary of Activity in Valuation Allowance for Impairment of Residential Mortgage-Servicing Rights (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Valuation allowance, beginning of period	$ 41	$ 39
Additions charged to (reduction credited from) operations	12	(1)
Valuation allowance, end of period	$ 53	$ 38

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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