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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Amortized Cost And Fair Value Debt Securities [Abstract]        
Gross realized gains on sales of investment securities $ 365 $ 304 $ 1,786 $ 313
Gross realized losses on sales of investment securities (1) (1) (1) (1)
Net realized gain (loss) on redemption or sale of investment securities 364 303 1,785 312
Proceeds from sales of investment securities 45,843 15,764 126,056 24,764
Tax expense on sales of investment securities $ 153 $ 127 $ 751 $ 131