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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Investments Debt And Equity Securities [Abstract]        
Gross realized gains on sales of investment securities $ 619 $ 10 $ 932 $ 1,442
Gross realized losses on sales of investment securities (8)   (9) (50)
Net realized gains on sales of investment securities 611 10 923 1,392
Proceeds from sales of investment securities 26,661 8,000 41,560 96,538
Tax expense on sales of investment securities $ 257 $ 4 $ 388 $ 585