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Impairment of Investment Securities - Schedule of Unrealized Losses and Estimated Fair Values (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Estimated Fair Value, Less Than 12 Months | $ 703,866,000 |  | $ 820,209,000
Grous Unrealized Losses Less Than 12 Months | (13,351,000) | (24,588,000) |
Estimated Fair Value, 12 Months or More | 199,201,000 |  | 110,947,000
Gross Unrealized Losses 12 Months or More | (22,359,000) | (23,078,000) |
Total Estimated Fair Value | 903,067,000 |  | 931,156,000
Total Gross Unrealized Losses | (35,710,000) | (47,666,000) |
US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Estimated Fair Value, Less Than 12 Months | 2,044,000 |  | 2,035,000
Grous Unrealized Losses Less Than 12 Months | (34,000) | (59,000) |
Estimated Fair Value, 12 Months or More | 0 |  | 0
Gross Unrealized Losses 12 Months or More | 0 | 0 |
Total Estimated Fair Value | 2,044,000 |  | 2,035,000
Total Gross Unrealized Losses | (34,000) | (59,000) |
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Residential [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Estimated Fair Value, Less Than 12 Months | 459,224,000 |  | 632,231,000
Grous Unrealized Losses Less Than 12 Months | (11,805,000) | (22,844,000) |
Estimated Fair Value, 12 Months or More | 149,391,000 |  | 65,324,000
Gross Unrealized Losses 12 Months or More | (7,667,000) | (4,319,000) |
Total Estimated Fair Value | 608,615,000 |  | 697,555,000
Total Gross Unrealized Losses | (19,472,000) | (27,163,000) |
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Estimated Fair Value, Less Than 12 Months | 237,136,000 |  | 183,542,000
Grous Unrealized Losses Less Than 12 Months | (1,452,000) | (1,448,000) |
Estimated Fair Value, 12 Months or More | 24,570,000 |  | 24,501,000
Gross Unrealized Losses 12 Months or More | (411,000) | (479,000) |
Total Estimated Fair Value | 261,706,000 |  | 208,043,000
Total Gross Unrealized Losses | (1,863,000) | (1,927,000) |
Obligations of States and Political Subdivisions [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Estimated Fair Value, Less Than 12 Months | 2,825,000 |  |
Grous Unrealized Losses Less Than 12 Months | (3,000) |  |
Estimated Fair Value, 12 Months or More | 0 |  |
Gross Unrealized Losses 12 Months or More | 0 |  |
Total Estimated Fair Value | 2,825,000 |  |
Total Gross Unrealized Losses | (3,000) |  |
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Estimated Fair Value, Less Than 12 Months | 2,637,000 |  | 2,401,000
Grous Unrealized Losses Less Than 12 Months | (57,000) | (237,000) |
Estimated Fair Value, 12 Months or More | 25,240,000 |  | 21,122,000
Gross Unrealized Losses 12 Months or More | (14,281,000) | (18,280,000) |
Total Estimated Fair Value | 27,877,000 |  | 23,523,000
Total Gross Unrealized Losses | (14,338,000) | (18,517,000) |
Equity Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Estimated Fair Value | $ 0 | $ 0 |

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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