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Impairment of Investment Securities - Schedule of Unrealized Losses and Estimated Fair Values (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Schedule Of Unrealized Losses On Securities [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | $ 135,599 | $ 61,767
Gross Unrealized Losses Less Than 12 Months | (464) | (701)
Estimated Fair Value, 12 Months or More | 23,350 | 22,943
Gross Unrealized Losses 12 Months or More | (28,496) | (31,785)
Total Estimated Fair Value | 158,949 | 84,710
Total Gross Unrealized Losses | (28,960) | (32,486)
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |
Schedule Of Unrealized Losses On Securities [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | 0 | 0
Gross Unrealized Losses Less Than 12 Months | 0 | 0
Estimated Fair Value, 12 Months or More | 23,316 | 22,927
Gross Unrealized Losses 12 Months or More | (28,496) | (31,785)
Total Estimated Fair Value | 23,316 | 22,927
Total Gross Unrealized Losses | (28,496) | (31,785)
Obligations of States and Political Subdivisions [Member] |  |
Schedule Of Unrealized Losses On Securities [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | 0 | 0
Gross Unrealized Losses Less Than 12 Months | 0 | 0
Estimated Fair Value, 12 Months or More | 0 | 0
Gross Unrealized Losses 12 Months or More | 0 | 0
Total Estimated Fair Value | 0 | 0
Total Gross Unrealized Losses | 0 | 0
Corporate Securities [Member] |  |
Schedule Of Unrealized Losses On Securities [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | 0 | 4,536
Gross Unrealized Losses Less Than 12 Months | 0 | (562)
Estimated Fair Value, 12 Months or More | 0 | 0
Gross Unrealized Losses 12 Months or More | 0 | 0
Total Estimated Fair Value | 0 | 4,536
Total Gross Unrealized Losses | 0 | (562)
Obligations of U.S. Government [Member] | Mortgage - Backed Securities - Residential [Member] |  |
Schedule Of Unrealized Losses On Securities [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | 0 | 1,086
Gross Unrealized Losses Less Than 12 Months | 0 | (6)
Estimated Fair Value, 12 Months or More | 13 | 16
Gross Unrealized Losses 12 Months or More | 0 | 0
Total Estimated Fair Value | 13 | 1,102
Total Gross Unrealized Losses | 0 | (6)
Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage - Backed Securities - Residential [Member] |  |
Schedule Of Unrealized Losses On Securities [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | 76,296 | 25
Gross Unrealized Losses Less Than 12 Months | (392) |
Estimated Fair Value, 12 Months or More | 21 | 0
Gross Unrealized Losses 12 Months or More | 0 | 0
Total Estimated Fair Value | 76,317 | 25
Total Gross Unrealized Losses | (392) | 0
Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage - Backed Securities - Commercial [Member] |  |
Schedule Of Unrealized Losses On Securities [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | 0 | 151
Gross Unrealized Losses Less Than 12 Months | 0 | (1)
Estimated Fair Value, 12 Months or More | 0 | 0
Gross Unrealized Losses 12 Months or More | 0 | 0
Total Estimated Fair Value | 0 | 151
Total Gross Unrealized Losses | 0 | (1)
Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government - Sponsored Enterprises [Member] |  |
Schedule Of Unrealized Losses On Securities [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | 59,303 | 55,969
Gross Unrealized Losses Less Than 12 Months | (72) | (132)
Estimated Fair Value, 12 Months or More | 0 | 0
Gross Unrealized Losses 12 Months or More | 0 | 0
Total Estimated Fair Value | 59,303 | 55,969
Total Gross Unrealized Losses | $ (72) | $ (132)

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