Quarterly report pursuant to Section 13 or 15(d)

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

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Securities - Realized Gains and Losses on Sales of Investment Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]    
Gross realized losses on sales of securities $ 0 $ 2,194
Gross realized losses on sales of securities 0 (10)
Net realized gains on sales of securities 0 2,184
Proceeds from sales of securities $ 0 $ 176,848