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Derivative Financial Instruments - Schedule of Amounts Related to Interest Rate Derivatives Included in Income Designated as Hedges of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Designated as Hedging Instrument [Member] Junior Subordinated Deferred Interest Debentures [Member] | Jun. 30, 2012 Designated as Hedging Instrument [Member] Junior Subordinated Deferred Interest Debentures [Member] | Jun. 30, 2013 Designated as Hedging Instrument [Member] Junior Subordinated Deferred Interest Debentures [Member] | Jun. 30, 2012 Designated as Hedging Instrument [Member] Junior Subordinated Deferred Interest Debentures [Member] | Jun. 30, 2013 Designated as Hedging Instrument [Member] Interest Income on Loans [Member] Interest Rate Swaps/Caps/Floors on Variable-Rate Loans [Member] | Jun. 30, 2012 Designated as Hedging Instrument [Member] Interest Income on Loans [Member] Interest Rate Swaps/Caps/Floors on Variable-Rate Loans [Member] | Jun. 30, 2013 Designated as Hedging Instrument [Member] Interest Income on Loans [Member] Interest Rate Swaps/Caps/Floors on Variable-Rate Loans [Member] | Jun. 30, 2012 Designated as Hedging Instrument [Member] Interest Income on Loans [Member] Interest Rate Swaps/Caps/Floors on Variable-Rate Loans [Member] | Jun. 30, 2013 Designated as Hedging Instrument [Member] Interest Expense [Member] Junior Subordinated Deferred Interest Debentures [Member] | Jun. 30, 2012 Designated as Hedging Instrument [Member] Interest Expense [Member] Junior Subordinated Deferred Interest Debentures [Member] | Jun. 30, 2013 Designated as Hedging Instrument [Member] Interest Expense [Member] Junior Subordinated Deferred Interest Debentures [Member] | Jun. 30, 2012 Designated as Hedging Instrument [Member] Interest Expense [Member] Junior Subordinated Deferred Interest Debentures [Member]
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount reclassified from accumulated other comprehensive income to interest income on loans |  |  |  |  |  |  | $ 9,345 | $ 9,345 | $ 18,690 | $ 18,690 | $ 1,103 | $ 1,044 | $ 2,188 | $ 2,077
Amount of gain (loss) recognized in other comprehensive income | $ 32,000 | $ 44,200 | $ (33) | $ (64) | $ (33) | $ (491) |  |  |  |  |  |  |  |

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + 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 (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959 + 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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