Loans And Allowance For Loan Losses (Summary Of Individual And Collective Allowance For Loan Losses And Loan Balances By Class) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually Evaluated for Impairment	$ 4,717	$ 7,147
Allowance Collectively Evaluated for Impairment	97,997	93,515
Loans	7,979,450	6,856,667
Loans Outstanding Individually Evaluated for Impairment	44,958	83,504
Loans Outstanding Collectively Evaluated for Impairment	7,934,492	6,773,163
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually Evaluated for Impairment	2,001	2,482
Allowance Collectively Evaluated for Impairment	28,169	27,855
Loans	2,597,029	2,341,646
Loans Outstanding Individually Evaluated for Impairment	15,419	36,566
Loans Outstanding Collectively Evaluated for Impairment	2,581,610	2,305,080
Commercial Real Estate - FL [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually Evaluated for Impairment	2,389	2,389
Allowance Collectively Evaluated for Impairment	4,244	10,557
Loans	71,887	154,081
Loans Outstanding Individually Evaluated for Impairment	23,354	39,122
Loans Outstanding Collectively Evaluated for Impairment	48,533	114,959
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually Evaluated for Impairment	327	2,276
Allowance Collectively Evaluated for Impairment	32,448	23,200
Loans	1,532,366	1,363,692
Loans Outstanding Individually Evaluated for Impairment	6,185	7,816
Loans Outstanding Collectively Evaluated for Impairment	1,526,181	1,355,876
Commercial Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Collectively Evaluated for Impairment	1,750	1,556
Loans	127,065	110,795
Loans Outstanding Collectively Evaluated for Impairment	127,065	110,795
Total Commercial Loans And Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually Evaluated for Impairment	4,717	7,147
Allowance Collectively Evaluated for Impairment	66,611	63,168
Loans	4,328,347	3,970,214
Loans Outstanding Individually Evaluated for Impairment	44,958	83,504
Loans Outstanding Collectively Evaluated for Impairment	4,283,389	3,886,710
Direct Installment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Collectively Evaluated for Impairment	15,005	14,814
Loans	1,128,310	1,029,187
Loans Outstanding Collectively Evaluated for Impairment	1,128,310	1,029,187
Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Collectively Evaluated for Impairment	4,516	4,437
Loans	1,121,237	670,936
Loans Outstanding Collectively Evaluated for Impairment	1,121,237	670,936
Indirect Installment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Collectively Evaluated for Impairment	5,675	5,503
Loans	583,939	540,789
Loans Outstanding Collectively Evaluated for Impairment	583,939	540,789
Consumer Lines Of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Collectively Evaluated for Impairment	6,028	5,447
Loans	780,155	607,280
Loans Outstanding Collectively Evaluated for Impairment	780,155	607,280
Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Collectively Evaluated for Impairment	162	146
Loans	37,462	38,261
Loans Outstanding Collectively Evaluated for Impairment	$ 37,462	$ 38,261

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

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The balance of financing receivables that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph e

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 116

-IssueDate 2006-05-01

-Chapter 8

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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