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Impairment of Investment Securities - Schedule of Unrealized Losses and Estimated Fair Values (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Estimated Fair Value, Less Than 12 Months |  |  | $ 61,767 |
Gross Unrealized Losses Less Than 12 Months |  |  | (701) |
Estimated Fair Value, 12 Months or More |  |  | 22,943 |
Gross Unrealized Losses 12 Months or More |  |  | (31,785) |
Total Estimated Fair Value |  |  | 84,710 |
Total Gross Unrealized Losses |  |  | (32,486) |
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Estimated Fair Value, Less Than 12 Months |  |  | 0 |
Gross Unrealized Losses Less Than 12 Months |  |  | 0 |
Estimated Fair Value, 12 Months or More |  |  | 22,927 |
Gross Unrealized Losses 12 Months or More |  |  | (31,785) |
Total Estimated Fair Value |  |  | 22,927 |
Total Gross Unrealized Losses |  |  | (31,785) |
Debt Securities [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Estimated Fair Value, Less Than 12 Months | 2,424 |  |  |
Gross Unrealized Losses Less Than 12 Months | (2) |  |  |
Estimated Fair Value, 12 Months or More | 23,010 |  |  |
Gross Unrealized Losses 12 Months or More | (29,647) |  |  |
Total Estimated Fair Value | 25,434 |  |  |
Total Gross Unrealized Losses | (29,649) |  |  |
Equities [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Estimated Fair Value, Less Than 12 Months | 0 |  |  |
Gross Unrealized Losses Less Than 12 Months | 0 |  |  |
Estimated Fair Value, 12 Months or More | 0 |  |  |
Gross Unrealized Losses 12 Months or More | 0 |  |  |
Total Estimated Fair Value | 0 |  |  |
Total Gross Unrealized Losses | 0 |  |  |
Corporate Securities [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Estimated Fair Value, Less Than 12 Months |  |  | 4,536 |
Gross Unrealized Losses Less Than 12 Months |  |  | (562) |
Estimated Fair Value, 12 Months or More |  |  | 0 |
Gross Unrealized Losses 12 Months or More |  |  | 0 |
Total Estimated Fair Value |  |  | 4,536 |
Total Gross Unrealized Losses |  |  | (562) |
Obligations of U.S. Government Agencies [Member] | Mortgage Backed Securities - Residential [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [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 | 14 |  | 16 |
Gross Unrealized Losses 12 Months or More | 0 | [1] | 0 | [1]
Total Estimated Fair Value | 14 |  | 1,102 |
Total Gross Unrealized Losses | 0 |  | (6) |
Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage Backed Securities - Residential [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Estimated Fair Value, Less Than 12 Months | 26 |  | 25 |
Gross Unrealized Losses Less Than 12 Months | 0 | [1] | 0 | [1]
Estimated Fair Value, 12 Months or More | 0 |  | 0 |
Gross Unrealized Losses 12 Months or More | 0 |  | 0 |
Total Estimated Fair Value | 26 |  | 25 |
Total Gross Unrealized Losses | 0 |  | 0 |
Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government Sponsored Enterprises [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Estimated Fair Value, Less Than 12 Months | 2,398 |  | 55,969 |
Gross Unrealized Losses Less Than 12 Months | (2) |  | (132) |
Estimated Fair Value, 12 Months or More | 0 |  | 0 |
Gross Unrealized Losses 12 Months or More | 0 |  | 0 |
Total Estimated Fair Value | 2,398 |  | 55,969 |
Total Gross Unrealized Losses | (2) |  | (132) |
Obligations of U.S. Government-Sponsored Enterprises [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Estimated Fair Value, Less Than 12 Months | 0 |  |  |
Gross Unrealized Losses Less Than 12 Months | 0 |  |  |
Estimated Fair Value, 12 Months or More | 22,996 |  |  |
Gross Unrealized Losses 12 Months or More | (29,647) |  |  |
Total Estimated Fair Value | 22,996 |  |  |
Total Gross Unrealized Losses | (29,647) |  |  |
Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage Backed Securities - Commercial [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Estimated Fair Value, Less Than 12 Months |  |  | 151 |
Gross Unrealized Losses Less Than 12 Months |  |  | (1) |
Estimated Fair Value, 12 Months or More |  |  | 0 |
Gross Unrealized Losses 12 Months or More |  |  | 0 |
Total Estimated Fair Value |  |  | 151 |
Total Gross Unrealized Losses |  |  | $ (1) |
[1] | Gross unrealized losses related to these types of securities are less than $1 thousand.

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