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Loans, Allowance for Loan and Lease Losses, and Reserve for Off-Balance Sheet Credit Commitments (Details 4) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Financing Receivable, Impaired          
Recorded Investment $ 173,782,000 $ 120,734,000 $ 173,782,000 $ 120,734,000 $ 148,734,000
Unpaid Contractual Principal Balance 221,199,000 226,737,000 221,199,000 226,737,000 194,517,000
Related Allowance 7,550,000 11,068,000 7,550,000 11,068,000 13,262,000
Average Recorded Investment 162,361,000 133,111,000 157,818,000 152,326,000  
Interest Income Recognized 220,000 279,000 405,000 896,000  
Troubled debt restructured loans on accrual 72,800,000   72,800,000   46,600,000
TDR loans 113,700,000   113,700,000   89,400,000
Specific Reserves 2,600,000   2,600,000   1,700,000
Troubled debt restructured loans          
Additions to TDR loans     66,400,000    
Payment received on TDR Loans     35,900,000    
Total Troubled Debt Restructured Loans
          
Financing Receivable, Impaired          
Number of Contracts 8   15    
Pre-Modification Outstanding Principal 43,336,000   66,505,000    
Period-End Outstanding Principal 43,305,000   62,641,000    
Troubled debt restructured loans          
Number of contracts 2   5    
Period-End Outstanding Principal 4,327,000   5,712,000    
Period-End Specific Reserve 277,000   277,000    
Commercial
          
Financing Receivable, Impaired          
Recorded Investment 43,144,000 18,474,000 43,144,000 18,474,000 25,780,000
Unpaid Contractual Principal Balance 54,838,000 69,986,000 54,838,000 69,986,000 32,965,000
Related Allowance 2,850,000 7,605,000 2,850,000 7,605,000 7,135,000
Average Recorded Investment 41,780,000 15,899,000 36,446,000 15,887,000  
Number of Contracts 4   9    
Pre-Modification Outstanding Principal 18,179,000   35,161,000    
Period-End Outstanding Principal 18,148,000   32,351,000    
Troubled debt restructured loans          
Number of contracts 2   3    
Period-End Outstanding Principal 4,327,000   4,341,000    
Period-End Specific Reserve 277,000   277,000    
Commercial real estate mortgages
          
Financing Receivable, Impaired          
Recorded Investment 45,491,000 23,769,000 45,491,000 23,769,000 30,678,000
Unpaid Contractual Principal Balance 51,373,000 32,567,000 51,373,000 32,567,000 35,198,000
Related Allowance 2,282,000 1,150,000 2,282,000 1,150,000 1,551,000
Average Recorded Investment 33,899,000 24,779,000 32,825,000 30,732,000  
Interest Income Recognized 55,000 60,000 124,000 190,000  
Number of Contracts 2   2    
Pre-Modification Outstanding Principal 15,832,000   15,832,000    
Period-End Outstanding Principal 15,832,000   15,832,000    
Residential mortgage
          
Financing Receivable, Impaired          
Recorded Investment 13,634,000 12,536,000 13,634,000 12,536,000 9,146,000
Unpaid Contractual Principal Balance 15,510,000 13,822,000 15,510,000 13,822,000 10,046,000
Related Allowance 398,000 56,000 398,000 56,000 108,000
Average Recorded Investment 13,317,000 12,506,000 11,927,000 14,001,000  
Interest Income Recognized 39,000 41,000 39,000 196,000  
Fixed
          
Financing Receivable, Impaired          
Number of Contracts     1    
Pre-Modification Outstanding Principal     655,000    
Real estate construction
          
Financing Receivable, Impaired          
Recorded Investment 66,529,000 60,630,000 66,529,000 60,630,000 75,811,000
Unpaid Contractual Principal Balance 92,885,000 98,936,000 92,885,000 98,936,000 102,321,000
Related Allowance 1,866,000 1,853,000 1,866,000 1,853,000 4,377,000
Average Recorded Investment 67,108,000 71,117,000 70,009,000 83,531,000  
Interest Income Recognized 126,000 175,000 242,000 405,000  
Construction
          
Financing Receivable, Impaired          
Number of Contracts 2   3    
Pre-Modification Outstanding Principal 9,325,000   14,857,000    
Period-End Outstanding Principal 9,325,000   14,458,000    
Land
          
Troubled debt restructured loans          
Number of contracts     2    
Period-End Outstanding Principal     1,371,000    
Equity lines of credit
          
Financing Receivable, Impaired          
Recorded Investment 4,434,000 4,522,000 4,434,000 4,522,000 6,633,000
Unpaid Contractual Principal Balance 5,666,000 5,106,000 5,666,000 5,106,000 7,786,000
Related Allowance 154,000 404,000 154,000 404,000 91,000
Average Recorded Investment 5,707,000 4,386,000 6,016,000 4,548,000  
Interest Income Recognized   3,000   6,000  
Installment loan
          
Financing Receivable, Impaired          
Recorded Investment 550,000 41,000 550,000 41,000 658,000
Unpaid Contractual Principal Balance 927,000 41,000 927,000 41,000 976,000
Average Recorded Investment 550,000 3,489,000 586,000 2,340,000  
Lease financing
          
Financing Receivable, Impaired          
Recorded Investment   762,000   762,000 28,000
Unpaid Contractual Principal Balance   6,279,000   6,279,000 5,225,000
Average Recorded Investment   935,000 9,000 1,287,000  
Interest Income Recognized       99,000  
Impaired loans without specific allowance
          
Financing Receivable, Impaired          
Recorded Investment 130,354,000 84,292,000 130,354,000 84,292,000 99,655,000
Unpaid Contractual Principal Balance 165,042,000 155,751,000 165,042,000 155,751,000 129,072,000
Average Recorded Investment 116,569,000 97,960,000 110,931,000 115,131,000  
Interest Income Recognized 220,000 276,000 405,000 890,000  
Impaired loans without specific allowance | Commercial
          
Financing Receivable, Impaired          
Recorded Investment 32,378,000 4,007,000 32,378,000 4,007,000 10,153,000
Unpaid Contractual Principal Balance 43,247,000 23,764,000 43,247,000 23,764,000 11,588,000
Average Recorded Investment 30,100,000 5,204,000 23,451,000 5,901,000  
Impaired loans without specific allowance | Commercial real estate mortgages
          
Financing Receivable, Impaired          
Recorded Investment 28,368,000 14,610,000 28,368,000 14,610,000 19,867,000
Unpaid Contractual Principal Balance 33,107,000 21,607,000 33,107,000 21,607,000 23,983,000
Average Recorded Investment 21,188,000 16,550,000 20,748,000 18,866,000  
Interest Income Recognized 55,000 60,000 124,000 190,000  
Impaired loans without specific allowance | Residential mortgage
          
Financing Receivable, Impaired          
Recorded Investment 8,087,000 11,997,000 8,087,000 11,997,000 7,182,000
Unpaid Contractual Principal Balance 9,206,000 13,273,000 9,206,000 13,273,000 8,035,000
Average Recorded Investment 8,660,000 10,753,000 8,167,000 12,165,000  
Interest Income Recognized 39,000 41,000 39,000 196,000  
Impaired loans without specific allowance | Fixed
          
Financing Receivable, Impaired          
Recorded Investment 1,830,000 7,834,000 1,830,000 7,834,000 3,493,000
Unpaid Contractual Principal Balance 2,518,000 8,678,000 2,518,000 8,678,000 4,035,000
Average Recorded Investment 2,248,000 7,036,000 2,663,000 8,338,000  
Interest Income Recognized   17,000   162,000  
Impaired loans without specific allowance | Variable
          
Financing Receivable, Impaired          
Recorded Investment 6,257,000 4,163,000 6,257,000 4,163,000 3,689,000
Unpaid Contractual Principal Balance 6,688,000 4,595,000 6,688,000 4,595,000 4,000,000
Average Recorded Investment 6,412,000 3,717,000 5,504,000 3,827,000  
Interest Income Recognized 39,000 24,000 39,000 34,000  
Impaired loans without specific allowance | Real estate construction
          
Financing Receivable, Impaired          
Recorded Investment 57,764,000 50,455,000 57,764,000 50,455,000 56,426,000
Unpaid Contractual Principal Balance 74,310,000 88,236,000 74,310,000 88,236,000 72,940,000
Average Recorded Investment 51,450,000 61,621,000 53,109,000 74,250,000  
Interest Income Recognized 126,000 175,000 242,000 405,000  
Impaired loans without specific allowance | Construction
          
Financing Receivable, Impaired          
Recorded Investment 38,828,000 39,184,000 38,828,000 39,184,000 27,435,000
Unpaid Contractual Principal Balance 52,209,000 73,136,000 52,209,000 73,136,000 40,605,000
Average Recorded Investment 29,937,000 44,221,000 29,103,000 54,740,000  
Interest Income Recognized 126,000 175,000 242,000 405,000  
Impaired loans without specific allowance | Land
          
Financing Receivable, Impaired          
Recorded Investment 18,936,000 11,271,000 18,936,000 11,271,000 28,991,000
Unpaid Contractual Principal Balance 22,101,000 15,100,000 22,101,000 15,100,000 32,335,000
Average Recorded Investment 21,513,000 17,400,000 24,006,000 19,510,000  
Impaired loans without specific allowance | Equity lines of credit
          
Financing Receivable, Impaired          
Recorded Investment 3,207,000 2,420,000 3,207,000 2,420,000 5,341,000
Unpaid Contractual Principal Balance 4,245,000 2,551,000 4,245,000 2,551,000 6,325,000
Average Recorded Investment 4,621,000 2,856,000 4,861,000 2,906,000  
Impaired loans without specific allowance | Installment loan
          
Financing Receivable, Impaired          
Recorded Investment 550,000 41,000 550,000 41,000 658,000
Unpaid Contractual Principal Balance 927,000 41,000 927,000 41,000 976,000
Average Recorded Investment 550,000 41,000 586,000 41,000  
Impaired loans without specific allowance | Consumer Installment loan
          
Financing Receivable, Impaired          
Recorded Investment 550,000 41,000 550,000 41,000 658,000
Unpaid Contractual Principal Balance 927,000 41,000 927,000 41,000 976,000
Average Recorded Investment 550,000 41,000 586,000 41,000  
Impaired loans without specific allowance | Lease financing
          
Financing Receivable, Impaired          
Recorded Investment   762,000   762,000 28,000
Unpaid Contractual Principal Balance   6,279,000   6,279,000 5,225,000
Average Recorded Investment   935,000 9,000 1,002,000  
Interest Income Recognized       99,000  
Impaired loans with a specific allowance
          
Financing Receivable, Impaired          
Recorded Investment 43,428,000 36,442,000 43,428,000 36,442,000 49,079,000
Unpaid Contractual Principal Balance 56,157,000 70,986,000 56,157,000 70,986,000 65,445,000
Related Allowance 7,550,000 11,068,000 7,550,000 11,068,000 13,262,000
Average Recorded Investment 45,792,000 35,151,000 46,887,000 37,195,000  
Interest Income Recognized   3,000   6,000  
Impaired loans with a specific allowance | Commercial
          
Financing Receivable, Impaired          
Recorded Investment 10,766,000 14,467,000 10,766,000 14,467,000 15,627,000
Unpaid Contractual Principal Balance 11,591,000 46,222,000 11,591,000 46,222,000 21,377,000
Related Allowance 2,850,000 7,605,000 2,850,000 7,605,000 7,135,000
Average Recorded Investment 11,680,000 10,695,000 12,995,000 9,986,000  
Impaired loans with a specific allowance | Commercial real estate mortgages
          
Financing Receivable, Impaired          
Recorded Investment 17,123,000 9,159,000 17,123,000 9,159,000 10,811,000
Unpaid Contractual Principal Balance 18,266,000 10,960,000 18,266,000 10,960,000 11,215,000
Related Allowance 2,282,000 1,150,000 2,282,000 1,150,000 1,551,000
Average Recorded Investment 12,711,000 8,229,000 12,077,000 11,866,000  
Impaired loans with a specific allowance | Residential mortgage
          
Financing Receivable, Impaired          
Recorded Investment 5,547,000 539,000 5,547,000 539,000 1,964,000
Unpaid Contractual Principal Balance 6,304,000 549,000 6,304,000 549,000 2,011,000
Related Allowance 398,000 56,000 398,000 56,000 108,000
Average Recorded Investment 4,657,000 1,753,000 3,760,000 1,836,000  
Impaired loans with a specific allowance | Fixed
          
Financing Receivable, Impaired          
Recorded Investment 2,291,000 539,000 2,291,000 539,000 515,000
Unpaid Contractual Principal Balance 2,353,000 549,000 2,353,000 549,000 535,000
Related Allowance 236,000 56,000 236,000 56,000 40,000
Average Recorded Investment 2,316,000 1,046,000 1,716,000 886,000  
Impaired loans with a specific allowance | Variable
          
Financing Receivable, Impaired          
Recorded Investment 3,256,000   3,256,000   1,449,000
Unpaid Contractual Principal Balance 3,951,000   3,951,000   1,476,000
Related Allowance 162,000   162,000   68,000
Average Recorded Investment 2,341,000 707,000 2,044,000 950,000  
Impaired loans with a specific allowance | Real estate construction
          
Financing Receivable, Impaired          
Recorded Investment 8,765,000 10,175,000 8,765,000 10,175,000 19,385,000
Unpaid Contractual Principal Balance 18,575,000 10,700,000 18,575,000 10,700,000 29,381,000
Related Allowance 1,866,000 1,853,000 1,866,000 1,853,000 4,377,000
Average Recorded Investment 15,658,000 9,496,000 16,900,000 9,281,000  
Impaired loans with a specific allowance | Construction
          
Financing Receivable, Impaired          
Average Recorded Investment   4,409,000   5,889,000  
Impaired loans with a specific allowance | Land
          
Financing Receivable, Impaired          
Recorded Investment 8,765,000 10,175,000 8,765,000 10,175,000 19,385,000
Unpaid Contractual Principal Balance 18,575,000 10,700,000 18,575,000 10,700,000 29,381,000
Related Allowance 1,866,000 1,853,000 1,866,000 1,853,000 4,377,000
Average Recorded Investment 15,658,000 5,087,000 16,900,000 3,392,000  
Impaired loans with a specific allowance | Equity lines of credit
          
Financing Receivable, Impaired          
Recorded Investment 1,227,000 2,102,000 1,227,000 2,102,000 1,292,000
Unpaid Contractual Principal Balance 1,421,000 2,555,000 1,421,000 2,555,000 1,461,000
Related Allowance 154,000 404,000 154,000 404,000 91,000
Average Recorded Investment 1,086,000 1,530,000 1,155,000 1,642,000  
Interest Income Recognized   3,000   6,000  
Impaired loans with a specific allowance | Installment loan
          
Financing Receivable, Impaired          
Average Recorded Investment   3,448,000   2,299,000  
Impaired loans with a specific allowance | Commercial Installment loan
          
Financing Receivable, Impaired          
Average Recorded Investment   3,448,000   2,299,000  
Impaired loans with a specific allowance | Lease financing
          
Financing Receivable, Impaired          
Average Recorded Investment       $ 285,000