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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]        
Gross realized losses on sales of securities $ 2,048 $ 67 $ 6,310 $ 1,853
Gross realized losses on sales of securities 0 0 (166) (1)
Net realized gains on sales of securities 2,048 67 6,144 1,852
Proceeds from sales of securities 44,782 9,778 352,224 135,834
Proceeds from called, matured and paid-down of securities $ 31,245 $ 24,591 $ 94,108 $ 61,145