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Impairment of Investment Securities - Schedule of Unrealized Losses and Estimated Fair Values (Detail) (USD $) | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 US Government Agencies Residential Mortgage-backed Securities [Member] | Dec. 31, 2013 US Government Agencies Residential Mortgage-backed Securities [Member] | Sep. 30, 2014 Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Residential [Member] | Dec. 31, 2013 Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Residential [Member] | Sep. 30, 2014 Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] | Dec. 31, 2013 Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] | Sep. 30, 2014 Obligations of States and Political Subdivisions [Member] | Sep. 30, 2014 Pooled Trust Preferred Collateralized Debt Obligations [Member] | Dec. 31, 2013 Pooled Trust Preferred Collateralized Debt Obligations [Member] | Sep. 30, 2014 Equity Securities [Member] | Sep. 30, 2013 Equity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Fair Value, Less Than 12 Months | $ 446,488,000 | $ 820,209,000 | $ 2,862,000 | $ 2,035,000 | $ 282,378,000 | $ 632,231,000 | $ 159,666,000 | $ 183,542,000 | $ 1,582,000 | $ 0 | $ 2,401,000 |  |
Grous Unrealized Losses Less Than 12 Months | (1,758,000) | (24,588,000) | (10,000) | (59,000) | (1,311,000) | (22,844,000) | (434,000) | (1,448,000) | (3,000) | 0 | (237,000) |  |
Estimated Fair Value, 12 Months or More | 527,989,000 | 110,947,000 | 0 | 0 | 397,581,000 | 65,324,000 | 105,451,000 | 24,501,000 | 0 | 24,957,000 | 21,122,000 |  |
Gross Unrealized Losses 12 Months or More | (28,892,000) | (23,078,000) | 0 | 0 | (15,103,000) | (4,319,000) | (1,026,000) | (479,000) | 0 | (12,763,000) | (18,280,000) |  |
Total Estimated Fair Value | 974,477,000 | 931,156,000 | 2,862,000 | 2,035,000 | 679,959,000 | 697,555,000 | 265,117,000 | 208,043,000 | 1,582,000 | 24,957,000 | 23,523,000 | 0 | 0
Total Gross Unrealized Losses | $ (30,650,000) | $ (47,666,000) | $ (10,000) | $ (59,000) | $ (16,414,000) | $ (27,163,000) | $ (1,460,000) | $ (1,927,000) | $ (3,000) | $ (12,763,000) | $ (18,517,000) |  |

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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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