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Investment Securities - Additional Information (Detail)	12 Months Ended
Investment Securities - Additional Information (Detail)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Federal statutory income tax rate	35.00%	35.00%	35.00%
Lower Limit
Schedule of Available-for-sale Securities [Line Items]
Mortgage-backed securities contractual maturities (in years)	10
Upper Limit
Schedule of Available-for-sale Securities [Line Items]
Mortgage-backed securities contractual maturities (in years)	30

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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