Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (Loss) (Detail)

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Accumulated Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]    
Unrealized Gains and Losses on Available-for-Sale Securities, Balance at Beginning of Period $ 7,348 $ 4,115
Unrealized Gains and Losses on Available-for-Sale Securities, Other Comprehensive Income before Reclassification (568) 675
Unrealized Gains and Losses on Available-for-Sale Securities, Reclassification from Accumulated Other Comprehensive Income (9) (1)
Unrealized Gains and Losses on Available-for-Sale Securities, Period Change (568) 674
Unrealized Gains and Losses on Available-for-Sale Securities, Balance at End of Period 6,771 4,789
Unrealized Gains and Losses on Interest Rate Swap, Balance at Beginning of Period    (9)
Unrealized Gains and Losses on Interest Rate Swap, Other Comprehensive Income before Reclassification    1
Unrealized Gains and Losses on Interest Rate Swap, Reclassification from Accumulated Other Comprehensive Income      
Unrealized Gains and Losses on Interest Rate Swap, Period Change    1
Unrealized Gains and Losses on Interest Rate Swap, Balance at End of Period    (8)
Unrealized Gains and Losses on Interest-Only Strip, Balance at Beginning of Period 16 20
Unrealized Gains and Losses on Interest-Only Strip, Other Comprehensive Income before Reclassification 3 2
Unrealized Gains and Losses on Interest-Only Strip, Reclassification from Accumulated Other Comprehensive Income      
Unrealized Gains and Losses on Interest-Only Strip, Period Change 3 2
Unrealized Gains and Losses on Interest-Only Strip, Balance at End of Period 19 22
Tax (Expense) Benefit, Balance at Beginning of Period (1,946) (602)
Tax (Expense) Benefit, Other Comprehensive Income before Reclassification 251   
Tax (Expense) Benefit, Reclassification from Accumulated Other Comprehensive Income      
Tax (Expense) Benefit, Period Change 251   
Tax (Expense) Benefit, Balance at End of Period (1,695) (602)
Balance at Beginning of Period 5,418 (3,524)
Other Comprehensive Income before Reclassification (314) 678
Reclassification from Accumulated Other Comprehensive Income (9) (1)
Other Comprehensive (Loss) Income (323) 677
Balance at End of Period $ 5,095 $ 4,201