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
Mar. 31, 2014
Mar. 31, 2013
Amortized Cost And Fair Value Debt Securities [Abstract]    
Gross realized gains on sales of investment securities $ 1,421 $ 9
Gross realized losses on sales of investment securities      
Net realized gain (loss) on redemption or sale of investment securities 1,421 9
Proceeds from sales of investment securities 85,234 9,000
Tax expense on sales of investment securities $ 597 $ 4