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Loans, Allowance for Loan and Lease Losses, and Reserve for Off-Balance Sheet Credit Commitments (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Jul. 02, 2012
Jun. 30, 2012
Financing Receivable, Impaired        
Recorded Investment $ 138,592,000 $ 148,734,000    
Unpaid Contractual Principal Balance 182,602,000 194,517,000    
Related Allowance 2,403,000 13,262,000    
Average Recorded Investment 155,572,000 152,754,000    
Interest Income Recognized 1,198,000 1,384,000    
Minimum limit for nonperforming loans to be individually evaluated for impairment     1,000,000 500,000
Minimum limit for measuring impairment at the relationship level for borrowers with multiple loans exceeding $1,000,000     1,000,000  
Outstanding loan amount of previously reported impaired loans under $1,000,000 9,300,000      
Commercial
        
Financing Receivable, Impaired        
Recorded Investment 26,277,000 25,780,000    
Unpaid Contractual Principal Balance 32,173,000 32,965,000    
Related Allowance 952,000 7,135,000    
Average Recorded Investment 34,070,000 21,002,000    
Commercial real estate mortgages
        
Financing Receivable, Impaired        
Recorded Investment 53,085,000 30,678,000    
Unpaid Contractual Principal Balance 59,893,000 35,198,000    
Related Allowance 1,326,000 1,551,000    
Average Recorded Investment 41,955,000 29,754,000    
Interest Income Recognized 189,000 269,000    
Residential mortgage
        
Financing Receivable, Impaired        
Recorded Investment 8,810,000 9,146,000    
Unpaid Contractual Principal Balance 9,701,000 10,046,000    
Related Allowance 9,000 108,000    
Average Recorded Investment 11,186,000 12,281,000    
Interest Income Recognized 52,000 224,000    
Real estate construction
        
Financing Receivable, Impaired        
Recorded Investment 45,510,000 75,811,000    
Unpaid Contractual Principal Balance 74,283,000 102,321,000    
Related Allowance   4,377,000    
Average Recorded Investment 62,424,000 81,794,000    
Interest Income Recognized 957,000 787,000    
Equity lines of credit
        
Financing Receivable, Impaired        
Recorded Investment 4,461,000 6,633,000    
Unpaid Contractual Principal Balance 5,625,000 7,786,000    
Related Allowance 116,000 91,000    
Average Recorded Investment 5,400,000 5,386,000    
Interest Income Recognized   6,000    
Installment loan
        
Financing Receivable, Impaired        
Recorded Investment 449,000 658,000    
Unpaid Contractual Principal Balance 927,000 976,000    
Average Recorded Investment 531,000 1,667,000    
Lease financing
        
Financing Receivable, Impaired        
Recorded Investment   28,000    
Unpaid Contractual Principal Balance   5,225,000    
Average Recorded Investment 6,000 870,000    
Interest Income Recognized   98,000    
Impaired loans without specific allowance
        
Financing Receivable, Impaired        
Recorded Investment 119,511,000 99,655,000    
Unpaid Contractual Principal Balance 162,309,000 129,072,000    
Average Recorded Investment 116,332,000 110,397,000    
Interest Income Recognized 1,194,000 1,378,000    
Impaired loans without specific allowance | Commercial
        
Financing Receivable, Impaired        
Recorded Investment 18,761,000 10,153,000    
Unpaid Contractual Principal Balance 24,135,000 11,588,000    
Average Recorded Investment 23,538,000 6,525,000    
Impaired loans without specific allowance | Commercial real estate mortgages
        
Financing Receivable, Impaired        
Recorded Investment 42,882,000 19,867,000    
Unpaid Contractual Principal Balance 49,110,000 23,983,000    
Average Recorded Investment 29,190,000 18,585,000    
Interest Income Recognized 189,000 269,000    
Impaired loans without specific allowance | Residential mortgage
        
Financing Receivable, Impaired        
Recorded Investment 8,347,000 7,182,000    
Unpaid Contractual Principal Balance 9,194,000 8,035,000    
Average Recorded Investment 8,115,000 10,388,000    
Interest Income Recognized 48,000 224,000    
Impaired loans without specific allowance | Fixed
        
Financing Receivable, Impaired        
Recorded Investment 3,482,000 3,493,000    
Unpaid Contractual Principal Balance 3,757,000 4,035,000    
Average Recorded Investment 3,134,000 6,592,000    
Interest Income Recognized   170,000    
Impaired loans without specific allowance | Variable
        
Financing Receivable, Impaired        
Recorded Investment 4,865,000 3,689,000    
Unpaid Contractual Principal Balance 5,437,000 4,000,000    
Average Recorded Investment 4,981,000 3,796,000    
Interest Income Recognized 48,000 54,000    
Impaired loans without specific allowance | Real estate construction
        
Financing Receivable, Impaired        
Recorded Investment 45,510,000 56,426,000    
Unpaid Contractual Principal Balance 74,283,000 72,940,000    
Average Recorded Investment 50,664,000 69,962,000    
Interest Income Recognized 957,000 787,000    
Impaired loans without specific allowance | Construction
        
Financing Receivable, Impaired        
Recorded Investment 19,762,000 27,435,000    
Unpaid Contractual Principal Balance 33,267,000 40,605,000    
Average Recorded Investment 27,303,000 47,710,000    
Interest Income Recognized 692,000 787,000    
Impaired loans without specific allowance | Land
        
Financing Receivable, Impaired        
Recorded Investment 25,748,000 28,991,000    
Unpaid Contractual Principal Balance 41,016,000 32,335,000    
Average Recorded Investment 23,361,000 22,252,000    
Interest Income Recognized 265,000      
Impaired loans without specific allowance | Equity lines of credit
        
Financing Receivable, Impaired        
Recorded Investment 3,562,000 5,341,000    
Unpaid Contractual Principal Balance 4,660,000 6,325,000    
Average Recorded Investment 4,288,000 3,951,000    
Impaired loans without specific allowance | Installment loan
        
Financing Receivable, Impaired        
Recorded Investment 449,000 658,000    
Unpaid Contractual Principal Balance 927,000 976,000    
Average Recorded Investment 531,000 287,000    
Impaired loans without specific allowance | Consumer Installment loan
        
Financing Receivable, Impaired        
Recorded Investment 449,000 658,000    
Unpaid Contractual Principal Balance 927,000 976,000    
Average Recorded Investment 531,000 287,000    
Impaired loans without specific allowance | Lease financing
        
Financing Receivable, Impaired        
Recorded Investment   28,000    
Unpaid Contractual Principal Balance   5,225,000    
Average Recorded Investment 6,000 699,000    
Interest Income Recognized   98,000    
Impaired loans with a specific allowance
        
Financing Receivable, Impaired        
Recorded Investment 19,081,000 49,079,000    
Unpaid Contractual Principal Balance 20,293,000 65,445,000    
Related Allowance 2,403,000 13,262,000    
Average Recorded Investment 39,240,000 42,357,000    
Interest Income Recognized 4,000 6,000    
Impaired loans with a specific allowance | Commercial
        
Financing Receivable, Impaired        
Recorded Investment 7,516,000 15,627,000    
Unpaid Contractual Principal Balance 8,038,000 21,377,000    
Related Allowance 952,000 7,135,000    
Average Recorded Investment 10,532,000 14,477,000    
Impaired loans with a specific allowance | Commercial real estate mortgages
        
Financing Receivable, Impaired        
Recorded Investment 10,203,000 10,811,000    
Unpaid Contractual Principal Balance 10,783,000 11,215,000    
Related Allowance 1,326,000 1,551,000    
Average Recorded Investment 12,765,000 11,169,000    
Impaired loans with a specific allowance | Residential mortgage
        
Financing Receivable, Impaired        
Recorded Investment 463,000 1,964,000    
Unpaid Contractual Principal Balance 507,000 2,011,000    
Related Allowance 9,000 108,000    
Average Recorded Investment 3,071,000 1,893,000    
Interest Income Recognized 4,000      
Impaired loans with a specific allowance | Fixed
        
Financing Receivable, Impaired        
Recorded Investment 463,000 515,000    
Unpaid Contractual Principal Balance 507,000 535,000    
Related Allowance 9,000 40,000    
Average Recorded Investment 1,568,000 740,000    
Impaired loans with a specific allowance | Variable
        
Financing Receivable, Impaired        
Recorded Investment   1,449,000    
Unpaid Contractual Principal Balance   1,476,000    
Related Allowance   68,000    
Average Recorded Investment 1,503,000 1,153,000    
Interest Income Recognized 4,000      
Impaired loans with a specific allowance | Real estate construction
        
Financing Receivable, Impaired        
Recorded Investment   19,385,000    
Unpaid Contractual Principal Balance   29,381,000    
Related Allowance   4,377,000    
Average Recorded Investment 11,760,000 11,832,000    
Impaired loans with a specific allowance | Construction
        
Financing Receivable, Impaired        
Average Recorded Investment   3,534,000    
Impaired loans with a specific allowance | Land
        
Financing Receivable, Impaired        
Recorded Investment   19,385,000    
Unpaid Contractual Principal Balance   29,381,000    
Related Allowance   4,377,000    
Average Recorded Investment 11,760,000 8,298,000    
Impaired loans with a specific allowance | Equity lines of credit
        
Financing Receivable, Impaired        
Recorded Investment 899,000 1,292,000    
Unpaid Contractual Principal Balance 965,000 1,461,000    
Related Allowance 116,000 91,000    
Average Recorded Investment 1,112,000 1,435,000    
Interest Income Recognized   6,000    
Impaired loans with a specific allowance | Installment loan
        
Financing Receivable, Impaired        
Average Recorded Investment   1,380,000    
Impaired loans with a specific allowance | Commercial Installment loan
        
Financing Receivable, Impaired        
Average Recorded Investment   1,380,000    
Impaired loans with a specific allowance | Lease financing
        
Financing Receivable, Impaired        
Average Recorded Investment   $ 171,000