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 ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]        
Gross realized gains on sales of securities $ 938,000 $ 0 $ 1,206,000 $ 0
Gross realized losses on sales of securities 0 0 0 0
Net realized gains on sales of securities 938,000 0 1,206,000 0
Proceeds from sales of securities $ 40,115,000 $ 0 $ 52,688,000 $ 0