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Company's Gross Gains and Gross Losses Realized from Sale of Securities (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]                      
Gross realized gains                 $ 723 $ 6,963 $ 8,969
Gross realized losses                 (240) (1,699) (696)
Net gain on sale of securities $ 213 $ 228 $ (9) $ 51 $ 26 $ 178 $ 3,224 $ 1,836 $ 483 $ 5,264 $ 8,273