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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Investments Debt And Equity Securities [Abstract]        
Gross realized gains on sales of investment securities $ 304 $ 1,431 $ 313 $ 1,432
Gross realized losses on sales of investment securities (1) (50) (1) (50)
Net realized gains on sales of investment securities 303 1,381 312 1,382
Proceeds from sales of investment securities 15,764 85,538 24,764 88,538
Tax expense on sales of investment securities $ 127 $ 581 $ 131 $ 581