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Supplemental Comprehensive Income Disclosures - Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other Comprehensive Income [Line Items]      
Unrealized holding (losses) gains on securities arising during the period, Pretax Amount $ (2,854) $ 9,727 $ (8,377)
Noncredit related gains (losses) on securities not expected to be sold, Pretax Amount 2,193 (425) 6,633
Less: reclassification adjustment for (gains) losses on securities included in net income, Pretax Amount (192) (2,185) 6,822
Transition obligation, Pretax Amount 2 2 2
Net (loss) gain, Pretax Amount (300) (260) 440
Total other comprehensive (loss) income, Pretax Amount (1,151) 6,859 5,520
Unrealized holding (losses) gains on securities arising during the period, Tax (Expense) Benefit 1,006 (3,404) 2,931
Noncredit related gains (losses) on securities not expected to be sold, Tax (Expense) Benefit (768) 149 (2,321)
Less: reclassification adjustment for (gains) losses on securities included in net income, Tax (Expense) Benefit 67 765 (2,388)
Transition obligation, Tax (Expense) Benefit (1) (1) (1)
Net (loss) gain, Tax (Expense) Benefit 105 91 (154)
Total other comprehensive (loss) income, Tax (Expense) Benefit 409 (2,400) (1,933)
Unrealized holding (losses) gains on securities arising during the period, Net of Tax Amount (1,848) 6,323 (5,446)
Noncredit related gains (losses) on securities not expected to be sold, Net of Tax Amount 1,425 (276) 4,312
Less: reclassification adjustment for (gains) losses on securities included in net income, Net of Tax Amount (125) (1,420) 4,434
Transition obligation, Net of Tax Amount 2 2 2
Net (loss) gain, Net of Tax Amount (300) (260) 440
Total other comprehensive (loss) income, Net of Tax Amount $ (742) $ 4,459 $ 3,587