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Derivative Financial Instruments - Additional Information (Detail) (USD $) | 6 Months Ended | 12 Months Ended |  | 1 Months Ended | 6 Months Ended |  |  |  |
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Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Interest Rate Swaps With Upstream Financial Institution Counterparties [Member] | Oct. 31, 2007 Variable-Rate Loans Outstanding [Member] M | Jun. 30, 2013 Junior Subordinated Deferred Interest Debentures [Member] Y | Oct. 31, 2008 Junior Subordinated Deferred Interest Debentures [Member] | Jun. 30, 2013 Effective Cash Flow Hedges [Member] | Dec. 31, 2012 Effective Cash Flow Hedges [Member] | Jun. 30, 2013 Reclassified Effective Cash Flow Hedges [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount of interest rate swap contracts |  |  |  | $ 1,200,000,000 |  | $ 120,000,000 |  |  |
Principal amount outstanding of variable-rate loans |  |  |  | 1,200,000,000 |  | 120,000,000 |  |  |
Period For Which Cash Flow Hedges Were Used To Hedge Monthly Interest Receipts |  |  |  | 84 |  |  |  |  |
Deferred accumulated gain | 49,300,000 | 68,000,000 |  |  |  |  |  |  |
Deferred accumulated after-tax gain | 32,000,000 | 44,200,000 |  |  |  |  |  |  |
Deferred gain in earning | 49,300,000 |  |  |  |  |  |  |  |
Deferred after-tax gain in earning | 32,000,000 |  |  |  |  |  |  |  |
Period for which cash flow hedges were used to hedge quarterly interest payments |  |  |  |  | 5 |  |  |  |
Swap fixed interest rate to be paid |  |  |  |  | 5.47% |  |  |  |
Variable interest rate of three-month LIBOR plus a margin |  |  |  |  | 1.55% |  |  |  |
Weighted-average strike rate for outstanding interest rate caps | 2.89% |  |  |  |  |  |  |  |
Accumulated other comprehensive income net of tax |  |  |  |  |  |  | 30,800,000 | 41,600,000 | 10,900,000
Approximate credit exposure related to swaps with bank customers | 40,200,000 |  | 493,000 |  |  |  |  |  |
Aggregate fair value of securities posted as collateral for derivative contracts | 32,200,000 |  |  |  |  |  |  |  |
Cash collateral on deposit with other financial institutions | $ 1,300,000 |  |  |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80784-113994 + Details
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- Definition Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),2) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 7 + Details
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- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5708775-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Credit Derivative -URI http://asc.fasb.org/extlink&oid=6854095 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition The sum of the fair values, as of the date of each statement of financial position presented, of securities that are restricted as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 + Details
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