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, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]      
Gross Realized Gains on Sales of Investment Securities $ 1,447 $ 2,674 $ 228
Gross Realized Losses on Sales of Investment Securities (50) (1,039) (106)
Net Realized Gains on Sales of Investment Securities 1,396 1,635 122
Proceeds from Sales of Investment Securities 102,538 155,468 31,832
Tax Expense on Sales of Investment Securities $ 587 $ 687 $ 52