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Impairment of Investment Securities - Schedule of Unrealized Losses and Estimated Fair Values (Detail) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Estimated Fair Value, Less Than 12 Months | $ 744,297,000 |  | $ 135,599,000 |
Gross Unrealized Losses Less Than 12 Months | (20,700,000) |  | (464,000) |
Estimated Fair Value, 12 Months or More | 21,706,000 |  | 23,350,000 |
Gross Unrealized Losses 12 Months or More | (24,061,000) |  | (28,496,000) |
Total Estimated Fair Value | 766,003,000 |  | 158,949,000 |
Total Gross Unrealized Losses | 44,761,000 |  | 28,960,000 |
Corporate Debt Securities [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Estimated Fair Value, Less Than 12 Months | 4,798,000 |  |  |
Gross Unrealized Losses Less Than 12 Months | (26,000) |  |  |
Estimated Fair Value, 12 Months or More | 0 |  |  |
Gross Unrealized Losses 12 Months or More | 0 |  |  |
Total Estimated Fair Value | 4,798,000 |  |  |
Total Gross Unrealized Losses | 26,000 |  |  |
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Estimated Fair Value, Less Than 12 Months | 33,000 |  | 0 |
Gross Unrealized Losses Less Than 12 Months | (23,000) |  | 0 |
Estimated Fair Value, 12 Months or More | 21,706,000 |  | 23,316,000 |
Gross Unrealized Losses 12 Months or More | (24,061,000) |  | (28,496,000) |
Total Estimated Fair Value | 21,739,000 |  | 23,316,000 |
Total Gross Unrealized Losses | 24,084,000 |  | 28,496,000 |
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 | 2,096,000 |  | 0 |
Gross Unrealized Losses Less Than 12 Months | (27,000) |  | 0 |
Estimated Fair Value, 12 Months or More | 0 |  | 13,000 |
Gross Unrealized Losses 12 Months or More | 0 | [1] | 0 | [2]
Total Estimated Fair Value | 2,096,000 |  | 13,000 |
Total Gross Unrealized Losses | 27,000 |  | 0 |
US Government-sponsored Enterprises Debt Securities [Member] | Mortgage Backed Securities - Residential [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Estimated Fair Value, Less Than 12 Months | 550,385,000 |  | 76,296,000 |
Gross Unrealized Losses Less Than 12 Months | (17,643,000) |  | (392,000) |
Estimated Fair Value, 12 Months or More | 0 |  | 21,000 |
Gross Unrealized Losses 12 Months or More | 0 | [1] | 0 | [2]
Total Estimated Fair Value | 550,385,000 |  | 76,317,000 |
Total Gross Unrealized Losses | 17,643,000 |  | 392,000 |
US Government-sponsored Enterprises Debt Securities [Member] | Other Government Sponsored Enterprises [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Estimated Fair Value, Less Than 12 Months | 186,985,000 |  | 59,303,000 |
Gross Unrealized Losses Less Than 12 Months | (2,981,000) |  | (72,000) |
Estimated Fair Value, 12 Months or More | 0 |  | 0 |
Gross Unrealized Losses 12 Months or More | 0 |  | 0 |
Total Estimated Fair Value | 186,985,000 |  | 59,303,000 |
Total Gross Unrealized Losses | $ 2,981,000 |  | $ 72,000 |
[1] |
[2] | Gross unrealized losses related to these types of securities are less than $1 thousand.

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