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Investment Securities - Summary of Continuous Loss Position of Securities (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Investment [Line Items] |  |
Fair Value, Less than 12 months | $ 935,513 | $ 194,146
Gross Unrealized Holding Losses, Less than 12 months | 35,128 | 1,109
Fair Value, 12 months or longer | 22,785 | 70,017
Gross unrealized holding losses, 12 months or longer | 324 | 859
Fair Value | 958,298 | 264,163
Gross Unrealized Holding Losses | 35,452 | 1,968
Government agency [Member] |  |
Investment [Line Items] |  |
Fair Value, Less than 12 months | 320,167 | 51,134
Gross Unrealized Holding Losses, Less than 12 months | 16,223 | 248
Fair Value | 320,167 | 51,134
Gross Unrealized Holding Losses | 16,223 | 248
Residential mortgage-backed securities [Member] |  |
Investment [Line Items] |  |
Fair Value, Less than 12 months | 495,949 | 55,118
Gross Unrealized Holding Losses, Less than 12 months | 15,303 | 127
Fair Value | 495,949 | 55,118
Gross Unrealized Holding Losses | 15,303 | 127
CMO's / REMIC's - residential [Member] |  |
Investment [Line Items] |  |
Fair Value, Less than 12 months | 63,857 | 74,784
Gross Unrealized Holding Losses, Less than 12 months | 606 | 572
Fair Value, 12 months or longer | 20,706 | 69,042
Gross unrealized holding losses, 12 months or longer | 125 | 838
Fair Value | 84,563 | 143,826
Gross Unrealized Holding Losses | 731 | 1,410
Municipal bonds [Member] |  |
Investment [Line Items] |  |
Fair Value, Less than 12 months | 50,615 | 13,110
Gross Unrealized Holding Losses, Less than 12 months | 2,921 | 162
Fair Value, 12 months or longer | 2,079 | 975
Gross unrealized holding losses, 12 months or longer | 199 | 21
Fair Value | 52,694 | 14,085
Gross Unrealized Holding Losses | 3,120 | 183
Other securities [Member] |  |
Investment [Line Items] |  |
Fair Value, Less than 12 months | 4,925 |
Gross Unrealized Holding Losses, Less than 12 months | 75 |
Fair Value, 12 months or longer |  |
Gross unrealized holding losses, 12 months or longer |  |
Fair Value | 4,925 |
Gross Unrealized Holding Losses | $ 75 |

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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