Summary of Significant Accounting Policies - Additional Information (Detail) (Commercial Real Estate Portfolio Segment [Member])	12 Months Ended
	Dec. 31, 2013
Risk Level, Low [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability of default or principal loss - high	15.00%
Risk Level, Medium [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability of default or principal loss - high	33.00%
Risk Level, High [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability of default or principal loss - high	67.00%