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Loans, Allowance for Loan and Lease Losses, and Reserve for Off-Balance Sheet Credit Commitments (Details 4) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Financing Receivable, Impaired     
Recorded Investment$ 158,060,000 $ 158,060,000 $ 190,755,000
Unpaid Principal Balance158,475,000240,272,000158,475,000240,272,000190,412,000
Related Allowance18,933,00020,286,00018,933,00020,286,0005,444,000
Average Recorded Investment139,400,000251,100,000153,762,000299,200,000 
Interest Income Recognized331,000 1,227,000  
Impaired loans included in nonaccrual loans136,660,000229,382,000136,660,000229,382,000179,578,000
Troubled debt restructured loans on accrual21,815,00010,890,00021,815,00010,890,00010,834,000
Nonaccrual loans under $500,000 that are not individually evaluated for impairment9,500,0009,700,0009,500,0009,700,00011,300,000
Maximum limit for measuring impairment, not individually500,000 500,000  
Troubled debt restructured loans45,600,00042,800,00045,600,00042,800,00032,500,000
Specific reserves1,000,0001,700,0001,000,0001,700,0001,600,000
Commercial | Impaired loans without specific allowance
     
Financing Receivable, Impaired     
Recorded Investment4,768,000 4,768,000 7,295,000
Unpaid Principal Balance4,762,0007,005,0004,762,0007,005,0007,293,000
Average Recorded Investment4,388,000 5,618,000  
Commercial real estate mortgages | Impaired loans without specific allowance
     
Financing Receivable, Impaired     
Recorded Investment16,461,000 16,461,000 23,496,000
Unpaid Principal Balance16,460,00014,522,00016,460,00014,522,00023,426,000
Average Recorded Investment15,536,000 18,265,000  
Interest Income Recognized42,000 232,000  
Residential mortgage | Impaired loans without specific allowance
     
Financing Receivable, Impaired     
Recorded Investment8,262,000 8,262,000 14,990,000
Unpaid Principal Balance8,240,00014,111,0008,240,00014,111,00014,898,000
Average Recorded Investment10,129,000 11,190,000  
Interest Income Recognized23,000 219,000  
Real estate construction | Impaired loans without specific allowance
     
Financing Receivable, Impaired     
Recorded Investment70,634,000 70,634,000 99,510,000
Unpaid Principal Balance70,597,00099,087,00070,597,00099,087,00099,371,000
Average Recorded Investment60,545,000 73,347,000  
Interest Income Recognized266,000 671,000  
Impaired loans without specific allowance
     
Financing Receivable, Impaired     
Recorded Investment106,939,000 106,939,000 149,475,000
Unpaid Principal Balance106,830,000137,861,000106,830,000137,861,000149,133,000
Average Recorded Investment95,617,000 113,085,000  
Interest Income Recognized331,000 1,221,000  
Impaired loans without specific allowance | Fixed
     
Financing Receivable, Impaired     
Recorded Investment4,452,000 4,452,000 10,942,000
Unpaid Principal Balance4,433,000 4,433,000 10,858,000
Average Recorded Investment6,143,000 7,367,000  
Interest Income Recognized9,000 171,000  
Impaired loans without specific allowance | Variable
     
Financing Receivable, Impaired     
Recorded Investment3,810,000 3,810,000 4,048,000
Unpaid Principal Balance3,807,000 3,807,000 4,040,000
Average Recorded Investment3,986,000 3,823,000  
Interest Income Recognized14,000 48,000  
Impaired loans without specific allowance | Construction
     
Financing Receivable, Impaired     
Recorded Investment46,895,000 46,895,000 75,778,000
Unpaid Principal Balance46,733,000 46,733,000 75,639,000
Average Recorded Investment43,040,000 52,779,000  
Interest Income Recognized266,000 671,000  
Impaired loans without specific allowance | Land
     
Financing Receivable, Impaired     
Recorded Investment23,739,000 23,739,000 23,732,000
Unpaid Principal Balance23,864,000 23,864,000 23,732,000
Average Recorded Investment17,505,000 20,568,000  
Impaired loans without specific allowance | Consumer Installment loan
     
Financing Receivable, Impaired     
Recorded Investment653,000 653,000 41,000
Unpaid Principal Balance648,000 648,000 41,000
Average Recorded Investment347,000 194,000  
Equity lines of credit | Impaired loans without specific allowance
     
Financing Receivable, Impaired     
Recorded Investment5,695,000 5,695,000 3,006,000
Unpaid Principal Balance5,675,0002,303,0005,675,0002,303,0002,997,000
Average Recorded Investment4,058,000 3,603,000  
Installment loan | Impaired loans without specific allowance
     
Financing Receivable, Impaired     
Recorded Investment653,000 653,000 41,000
Unpaid Principal Balance648,00041,000648,00041,00041,000
Average Recorded Investment347,000 194,000  
Lease financing | Impaired loans without specific allowance
     
Financing Receivable, Impaired     
Recorded Investment466,000 466,000 1,137,000
Unpaid Principal Balance448,000792,000448,000792,0001,107,000
Average Recorded Investment614,000 868,000  
Interest Income Recognized  99,000  
Commercial | Impaired loans with a specific allowance
     
Financing Receivable, Impaired     
Recorded Investment26,802,000 26,802,000 8,567,000
Unpaid Principal Balance27,279,00018,029,00027,279,00018,029,0008,567,000
Related Allowance14,364,000 14,364,000 2,067,000
Average Recorded Investment20,635,000 14,190,000  
Commercial real estate mortgages | Impaired loans with a specific allowance
     
Financing Receivable, Impaired     
Recorded Investment9,438,000 9,438,000 19,139,000
Unpaid Principal Balance9,438,00034,742,0009,438,00034,742,00019,154,000
Related Allowance1,375,000 1,375,000 1,889,000
Average Recorded Investment9,299,000 11,259,000  
Residential mortgage | Impaired loans with a specific allowance
     
Financing Receivable, Impaired     
Recorded Investment1,992,000 1,992,000 2,001,000
Unpaid Principal Balance1,986,0001,428,0001,986,0001,428,0001,991,000
Related Allowance130,000 130,000 342,000
Average Recorded Investment1,266,000 1,875,000  
Real estate construction | Impaired loans with a specific allowance
     
Financing Receivable, Impaired     
Recorded Investment11,931,000 11,931,000 8,850,000
Unpaid Principal Balance11,987,00046,384,00011,987,00046,384,0008,850,000
Related Allowance2,989,000 2,989,000 366,000
Average Recorded Investment11,053,000 9,944,000  
Impaired loans with a specific allowance
     
Financing Receivable, Impaired     
Recorded Investment51,121,000 51,121,000 41,280,000
Unpaid Principal Balance51,645,000102,411,00051,645,000102,411,00041,279,000
Related Allowance18,933,000 18,933,000 5,444,000
Average Recorded Investment43,783,000 40,677,000  
Interest Income Recognized  6,000  
Impaired loans with a specific allowance | Fixed
     
Financing Receivable, Impaired     
Recorded Investment528,000 528,000 566,000
Unpaid Principal Balance524,000 524,000 563,000
Related Allowance    69,000
Average Recorded Investment534,000 797,000  
Impaired loans with a specific allowance | Variable
     
Financing Receivable, Impaired     
Recorded Investment1,464,000 1,464,000 1,435,000
Unpaid Principal Balance1,462,000 1,462,000 1,428,000
Related Allowance130,000 130,000 273,000
Average Recorded Investment732,000 1,078,000  
Impaired loans with a specific allowance | Construction
     
Financing Receivable, Impaired     
Recorded Investment    8,850,000
Unpaid Principal Balance    8,850,000
Related Allowance    366,000
Average Recorded Investment  4,417,000  
Impaired loans with a specific allowance | Land
     
Financing Receivable, Impaired     
Recorded Investment11,931,000 11,931,000  
Unpaid Principal Balance11,987,000 11,987,000  
Related Allowance2,989,000 2,989,000  
Average Recorded Investment11,053,000 5,527,000  
Impaired loans with a specific allowance | Commercial Installment loan
     
Financing Receivable, Impaired     
Average Recorded Investment  1,724,000  
Equity lines of credit | Impaired loans with a specific allowance
     
Financing Receivable, Impaired     
Recorded Investment958,000 958,000 1,868,000
Unpaid Principal Balance955,000883,000955,000883,0001,862,000
Related Allowance75,000 75,000 255,000
Average Recorded Investment1,530,000 1,471,000  
Interest Income Recognized  6,000  
Installment loan | Impaired loans with a specific allowance
     
Financing Receivable, Impaired     
Unpaid Principal Balance 90,000 90,000 
Average Recorded Investment  1,724,000  
Lease financing | Impaired loans with a specific allowance
     
Financing Receivable, Impaired     
Recorded Investment    855,000
Unpaid Principal Balance 855,000 855,000855,000
Related Allowance    525,000
Average Recorded Investment  214,000  
Commercial
     
Financing Receivable, Impaired     
Recorded Investment31,570,000 31,570,000 15,862,000
Unpaid Principal Balance32,041,00025,034,00032,041,00025,034,00015,860,000
Related Allowance14,364,00010,245,00014,364,00010,245,0002,067,000
Average Recorded Investment25,023,000 19,808,000  
Commercial real estate mortgages
     
Financing Receivable, Impaired     
Recorded Investment25,899,000 25,899,000 42,635,000
Unpaid Principal Balance25,898,00049,264,00025,898,00049,264,00042,580,000
Related Allowance1,375,0004,706,0001,375,0004,706,0001,889,000
Average Recorded Investment24,835,000 29,524,000  
Interest Income Recognized42,000 232,000  
Residential mortgage
     
Financing Receivable, Impaired     
Recorded Investment10,254,000 10,254,000 16,991,000
Unpaid Principal Balance10,226,00015,539,00010,226,00015,539,00016,889,000
Related Allowance130,00022,000130,00022,000342,000
Average Recorded Investment11,395,000 13,065,000  
Interest Income Recognized23,000 219,000  
Real estate construction
     
Financing Receivable, Impaired     
Recorded Investment82,565,000 82,565,000 108,360,000
Unpaid Principal Balance82,584,000145,471,00082,584,000145,471,000108,221,000
Related Allowance2,989,0004,384,0002,989,0004,384,000366,000
Average Recorded Investment71,598,000 83,291,000  
Interest Income Recognized266,000 671,000  
Equity lines of credit
     
Financing Receivable, Impaired     
Recorded Investment6,653,000 6,653,000 4,874,000
Unpaid Principal Balance6,630,0003,186,0006,630,0003,186,0004,859,000
Related Allowance75,00030,00075,00030,000255,000
Average Recorded Investment5,588,000 5,074,000  
Interest Income Recognized  6,000  
Installment loan
     
Financing Receivable, Impaired     
Recorded Investment653,000 653,000 41,000
Unpaid Principal Balance648,000131,000648,000131,00041,000
Related Allowance 44,000 44,000 
Average Recorded Investment347,000 1,918,000  
Lease financing
     
Financing Receivable, Impaired     
Recorded Investment466,000 466,000 1,992,000
Unpaid Principal Balance448,0001,647,000448,0001,647,0001,962,000
Related Allowance 855,000 855,000525,000
Average Recorded Investment614,000 1,082,000  
Interest Income Recognized  $ 99,000