Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Investments Debt And Equity Securities [Abstract]      
Gross realized gains on sales of investment securities $ 1,602 $ 1,447 $ 2,674
Gross realized losses on sales of investment securities (563) (50) (1,039)
Net realized gains on sales of investment securities 1,039 1,397 1,635
Proceeds from sales of investment securities 78,473 102,538 155,468
Tax expense on sales of investment securities $ 437 $ 587 $ 687