Quarterly report pursuant to Section 13 or 15(d)

Investment Securities - Realized Gains and Losses on Sales of Investment Securities (Detail)

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Investment Securities - Realized Gains and Losses on Sales of Investment Securities (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Amortized Cost and Fair Value Debt Securities [Abstract]    
Gross realized gains on sales of investment securities $ 2,194us-gaap_AvailableForSaleSecuritiesGrossRealizedGains $ 1,421us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses on sales of investment securities (10)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses  
Net realized gains on sales of investment securities 2,184us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet 1,421us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Proceeds from sales of investment securities $ 176,848us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 85,234us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities