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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Investment [Line Items] |  |
Fair Value, Less Than 12 Months | $ 926,016 | $ 194,146
Gross Unrealized Holding Losses, Less Than 12 Months | 40,597 | 1,109
Fair Value, 12 Months or Longer | 29,093 | 70,017
Gross Unrealized Holding Losses, 12 Months or Longer | 548 | 859
Fair Value | 955,109 | 264,163
Gross Unrealized Holding Losses | 41,145 | 1,968
Government agency [Member] |  |
Investment [Line Items] |  |
Fair Value, Less Than 12 Months | 312,948 | 51,134
Gross Unrealized Holding Losses, Less Than 12 Months | 20,603 | 248
Fair Value | 312,948 | 51,134
Gross Unrealized Holding Losses | 20,603 | 248
Residential mortgage-backed securities [Member] |  |
Investment [Line Items] |  |
Fair Value, Less Than 12 Months | 473,190 | 55,118
Gross Unrealized Holding Losses, Less Than 12 Months | 16,073 | 127
Fair Value | 473,190 | 55,118
Gross Unrealized Holding Losses | 16,073 | 127
CMO/REMICs [Member] |  |
Investment [Line Items] |  |
Fair Value, Less Than 12 Months | 92,281 | 74,784
Gross Unrealized Holding Losses, Less Than 12 Months | 988 | 572
Fair Value, 12 Months or Longer | 18,700 | 69,042
Gross Unrealized Holding Losses, 12 Months or Longer | 74 | 838
Fair Value | 110,981 | 143,826
Gross Unrealized Holding Losses | 1,062 | 1,410
Municipal bonds [Member] |  |
Investment [Line Items] |  |
Fair Value, Less Than 12 Months | 42,859 | 13,110
Gross Unrealized Holding Losses, Less Than 12 Months | 2,671 | 162
Fair Value, 12 Months or Longer | 10,393 | 975
Gross Unrealized Holding Losses, 12 Months or Longer | 474 | 21
Fair Value | 53,252 | 14,085
Gross Unrealized Holding Losses | 3,145 | 183
Other Securities [Member] |  |
Investment [Line Items] |  |
Fair Value, Less Than 12 Months | 4,738 |
Gross Unrealized Holding Losses, Less Than 12 Months | 262 |
Fair Value | 4,738 |
Gross Unrealized Holding Losses | $ 262 |

X
- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for twelve months or longer impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments on securities classified as available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months impacting investments. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + 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)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized 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 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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