Fair Value - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit spreads on Moody's rating	35 to 65 basis points
Liquidity risk adjustments ranged	20 to 55 basis points
Liquidity risk adjustments ranged, securities of 15 largest banks	20 to 40 basis points
Investment in three largest banks	$ 18,300,000
Investment in three largest banks percentage	49.44%
Write-downs on REO properties	15,000	50,000
Trust Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in floating rate trust preferred securities	$ 37,100,000