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Allowance for Loan Losses Troubled Debt Restructuring on Financing Receivables (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts     2,454
Financing Receivable, Modifications, Recorded Investment   $ 150,487 $ 158,000
Financing Receiables, Modifications, Unpaid Principal Balance     202,805
C&I
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 34 27 30
Financing Receivable, Modifications, Recorded Investment 9,441 [1] 4,380 [1] 9,173 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 13,369 [1] 10,042 [1] 17,252 [1]
Commercial Real Estate [Member]
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 68 60 60
Financing Receivable, Modifications, Recorded Investment 63,675 [1] 66,577 [1] 71,823 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 78,763 [1] 78,184 [1] 79,901 [1]
Construction
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 41 38 37
Financing Receivable, Modifications, Recorded Investment 7,087 [1] 11,126 [1] 19,321 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 27,437 [1] 40,966 [1] 47,969 [1]
Total commercial
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 143 125 127
Financing Receivable, Modifications, Recorded Investment 80,203 [1] 82,083 [1] 100,317 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 119,569 [1] 129,192 [1] 145,122 [1]
Installment
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 1,757 1,769 1,485
Financing Receivable, Modifications, Recorded Investment 30,140 [1] 30,870 [1] 31,043 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 31,654 [1] 32,653 [1] 31,043 [1]
Home Equity Line of Credit [Member]
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 281 261 194
Financing Receivable, Modifications, Recorded Investment 12,381 [1] 11,913 [1] 6,063 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 12,732 [1] 12,154 [1] 6,063 [1]
Consumer Credit Card Financing Receivable [Member]
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 329 389  
Financing Receivable, Modifications, Recorded Investment 1,262 [1] 1,612 [1] 1,998
Financing Receiables, Modifications, Unpaid Principal Balance 1,262 [1] 1,612 [1]  
Residential mortgages
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 293 298 187
Financing Receivable, Modifications, Recorded Investment 23,221 [1] 24,009 [1] 18,579 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 25,905 [1] 26,662 [1] 18,579 [1]
Total consumer
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 2,660 2,717 2,327
Financing Receivable, Modifications, Recorded Investment 67,004 [1] 68,404 [1] 57,683 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 71,553 [1] 73,081 [1] 57,683 [1]
Noncovered Loans Commercial [Member] | C&I
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 31 24 19
Financing Receivable, Modifications, Recorded Investment 7,806 [1] 2,617 [1] 4,074 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 11,489 [1] 8,044 [1] 10,584 [1]
Noncovered Loans Commercial [Member] | Commercial Real Estate [Member]
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 47 40 35
Financing Receivable, Modifications, Recorded Investment 17,361 [1] 16,305 [1] 18,618 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 21,742 [1] 20,701 [1] 22,135 [1]
Noncovered Loans Commercial [Member] | Construction
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 31 28 27
Financing Receivable, Modifications, Recorded Investment 1,005 [1] 2,955 [1] 3,970 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 1,282 [1] 3,419 [1] 4,542 [1]
Noncovered Loans Commercial [Member] | Total commercial
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 109 92 81
Financing Receivable, Modifications, Recorded Investment 26,172 [1] 21,877 [1] 26,662 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 34,513 [1] 32,164 [1] 37,261 [1]
Noncovered Consumer Loans [Member] | Installment
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 1,757 1,769 1,485
Financing Receivable, Modifications, Recorded Investment 30,140 [1] 30,870 [1] 31,043 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 31,654 [1] 32,653 [1] 31,043 [1]
Noncovered Consumer Loans [Member] | Home Equity Line of Credit [Member]
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 239 226 194
Financing Receivable, Modifications, Recorded Investment 6,819 [1] 6,281 [1] 6,063 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 7,142 [1] 6,488 [1] 6,063 [1]
Noncovered Consumer Loans [Member] | Consumer Credit Card Financing Receivable [Member]
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 329 389 461
Financing Receivable, Modifications, Recorded Investment 1,262 [1] 1,612 [1] 1,998 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 1,262 [1] 1,612 [1] 1,998 [1]
Noncovered Consumer Loans [Member] | Residential mortgages
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 293 298 187
Financing Receivable, Modifications, Recorded Investment 23,221 [1] 24,009 [1] 18,579 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 25,905 [1] 26,662 [1] 18,579 [1]
Noncovered Consumer Loans [Member] | Total consumer
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 2,618 2,682 2,327
Financing Receivable, Modifications, Recorded Investment 61,442 [1] 62,772 [1] 57,683 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 65,963 [1] 67,415 [1] 57,683 [1]
Originated Loans [Member]
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 2,727 2,774 2,408
Financing Receivable, Modifications, Recorded Investment 87,614 [1] 84,649 [1] 84,345 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 100,476 [1] 99,579 [1] 94,944 [1]
Covered Loans Commercial [Member] | C&I
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 3 3 11
Financing Receivable, Modifications, Recorded Investment 1,635 [1] 1,763 [1] 5,099 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 1,880 [1] 1,998 [1] 6,668 [1]
Covered Loans Commercial [Member] | Commercial Real Estate [Member]
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 21 20 25
Financing Receivable, Modifications, Recorded Investment 46,314 [1] 50,272 [1] 53,205 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 57,021 [1] 57,483 [1] 57,766 [1]
Covered Loans Commercial [Member] | Construction
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 10 10 10
Financing Receivable, Modifications, Recorded Investment 6,082 [1] 8,171 [1] 15,351 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 26,155 [1] 37,547 [1] 43,427 [1]
Covered Loans Commercial [Member] | Total commercial
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 34 33 46
Financing Receivable, Modifications, Recorded Investment 54,031 [1] 60,206 [1] 73,655 [1]
Financing Receiables, Modifications, Unpaid Principal Balance 85,056 [1] 97,028 [1] 107,861 [1]
Covered Consumer Loans [Member] [Member] | Home Equity Line of Credit [Member]
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 42 35  
Financing Receivable, Modifications, Recorded Investment 5,562 [1] 5,632 [1]  
Financing Receiables, Modifications, Unpaid Principal Balance 5,590 [1] 5,666 [1]  
Covered TDR Loans [Member]
      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 76 68 46
Financing Receivable, Modifications, Recorded Investment 59,593 [1] 65,838 [1] 73,655 [1]
Financing Receiables, Modifications, Unpaid Principal Balance $ 90,646 [1] $ 102,694 [1] $ 107,861 [1]
[1] The differences between the recorded investment and unpaid principal balance amounts represents partial charge offs.