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Loans and Allowance for Loan Losses (Troubled Debt Restructurings) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Contract
Sep. 30, 2011
Contract
Sep. 30, 2012
Contract
Sep. 30, 2011
Contract
Accruing TDRs With Modifications And Renewals Completed [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 199 106 650 417
Pre-modification Recorded Balance $ 130,610 $ 194,016 $ 346,993 $ 432,844
Post-modification Recorded Balance 118,117 192,807 334,081 430,980
Accruing TDRs With Modifications And Renewals Completed [Member] | Home Equity Lines [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 0 0 3 7
Pre-modification Recorded Balance 0 0 364 282
Post-modification Recorded Balance 0 0 364 282
Accruing TDRs With Modifications And Renewals Completed [Member] | Consumer Mortgages [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 62 6 250 185
Pre-modification Recorded Balance 6,409 3,621 24,588 24,812
Post-modification Recorded Balance 6,409 3,621 24,588 24,812
Accruing TDRs With Modifications And Renewals Completed [Member] | Credit Cards [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 0 0 0 0
Pre-modification Recorded Balance 0 0 0 0
Post-modification Recorded Balance 0 0 0 0
Accruing TDRs With Modifications And Renewals Completed [Member] | Other Retail Loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 28 2 78 18
Pre-modification Recorded Balance 1,980 285 6,284 1,072
Post-modification Recorded Balance 1,980 285 6,284 1,072
Accruing TDRs With Modifications And Renewals Completed [Member] | Investment Properties [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 18 23 55 52
Pre-modification Recorded Balance 16,109 38,156 94,457 125,420
Post-modification Recorded Balance 16,109 38,156 94,457 125,420
Accruing TDRs With Modifications And Renewals Completed [Member] | 1-4 Family Properties [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 34 22 90 55
Pre-modification Recorded Balance 24,083 54,614 58,224 105,494
Post-modification Recorded Balance 21,588 54,614 55,310 104,839
Accruing TDRs With Modifications And Renewals Completed [Member] | Land Acquisition [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 22 13 48 24
Pre-modification Recorded Balance 13,360 20,464 33,972 41,394
Post-modification Recorded Balance 13,360 20,464 33,972 41,394
Accruing TDRs With Modifications And Renewals Completed [Member] | Commercial Real Estate [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 74 58 193 131
Pre-modification Recorded Balance 53,552 113,234 186,653 272,308
Post-modification Recorded Balance 51,057 113,234 183,739 271,653
Accruing TDRs With Modifications And Renewals Completed [Member] | Commercial and Industrial [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 35 40 126 76
Pre-modification Recorded Balance 68,669 76,876 129,104 134,370
Post-modification Recorded Balance 58,671 75,667 119,106 133,161
Accruing TDRs With Modifications And Renewals Completed [Member] | Retail [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 90 8 331 210
Pre-modification Recorded Balance 8,389 3,906 31,236 26,166
Post-modification Recorded Balance 8,389 3,906 31,236 26,166
Non Accruing Tdrs With Modifications And Renewals Completed [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 41 35 85 82
Pre-modification Recorded Balance 28,097 48,375 72,779 85,804
Post-modification Recorded Balance 26,402 46,249 70,162 75,567
Non Accruing Tdrs With Modifications And Renewals Completed [Member] | Home Equity Lines [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 0 0 0 1
Pre-modification Recorded Balance 0 0 0 39
Post-modification Recorded Balance 0 0 0 39
Non Accruing Tdrs With Modifications And Renewals Completed [Member] | Consumer Mortgages [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 0 2 6 12
Pre-modification Recorded Balance 0 2,189 1,348 3,595
Post-modification Recorded Balance 0 1,938 1,304 3,345
Non Accruing Tdrs With Modifications And Renewals Completed [Member] | Credit Cards [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 0 0 0 0
Pre-modification Recorded Balance 0 0 0 0
Post-modification Recorded Balance 0 0 0 0
Non Accruing Tdrs With Modifications And Renewals Completed [Member] | Other Retail Loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 2 0 6 0
Pre-modification Recorded Balance 355 0 703 0
Post-modification Recorded Balance 355 0 703 0
Non Accruing Tdrs With Modifications And Renewals Completed [Member] | Investment Properties [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 2 7 5 10
Pre-modification Recorded Balance 8,647 13,788 15,402 28,572
Post-modification Recorded Balance 8,647 13,390 15,402 28,174
Non Accruing Tdrs With Modifications And Renewals Completed [Member] | 1-4 Family Properties [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 19 8 23 17
Pre-modification Recorded Balance 6,685 16,180 12,944 26,503
Post-modification Recorded Balance 6,685 16,180 12,914 20,505
Non Accruing Tdrs With Modifications And Renewals Completed [Member] | Land Acquisition [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 7 2 19 10
Pre-modification Recorded Balance 6,640 2,358 23,659 6,703
Post-modification Recorded Balance 4,945 2,358 21,866 5,767
Non Accruing Tdrs With Modifications And Renewals Completed [Member] | Commercial Real Estate [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 28 17 47 37
Pre-modification Recorded Balance 21,972 32,326 52,005 61,778
Post-modification Recorded Balance 20,277 31,928 50,182 54,446
Non Accruing Tdrs With Modifications And Renewals Completed [Member] | Commercial and Industrial [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 11 16 26 32
Pre-modification Recorded Balance 5,770 13,860 18,723 20,392
Post-modification Recorded Balance 5,770 12,383 17,973 17,737
Non Accruing Tdrs With Modifications And Renewals Completed [Member] | Retail [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Contracts 2 2 12 13
Pre-modification Recorded Balance 355 2,189 2,051 3,634
Post-modification Recorded Balance $ 355 $ 1,938 $ 2,007 $ 3,384