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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]        
Gross realized gains on sales of securities $ 267 $ 396 $ 1,473 $ 396
Gross realized losses on sales of securities 0 (350) 0 (350)
Net realized gains on sales of securities 267 46 1,473 46
Proceeds from sales of securities $ 17,644 $ 78,282 $ 70,333 $ 78,282