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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Amortized Cost and Fair Value Debt Securities [Abstract]        
Gross realized gains on sales of investment securities $ 67 $ 619 $ 1,853 $ 932
Gross realized losses on sales of investment securities   (8) (1) (9)
Net realized gains on sales of investment securities 67 611 1,852 923
Proceeds from sales of investment securities $ 9,778 $ 26,661 $ 140,855 $ 51,425