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Allowance for Probable Loan Losses (Details 4) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Interest Recognized |  |  |  |  |
Loans accounted for as troubled debt restructuring | $ 20,275,000 |  | $ 20,275,000 |  | $ 29,395,000
Period of charge off for past due unsecured commercial loans |  |  | 90 days |  |
Class of financing receivable |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with related allowance | 32,450,000 |  | 32,450,000 |  | 11,982,000
Total impaired loans with no related allowance | 66,576,000 |  | 66,576,000 |  | 71,023,000
Unpaid principal balance: |  |  |  |  |
Total impaired loans with an allowance recorded | 35,838,000 |  | 35,838,000 |  | 15,273,000
Total impaired loans with no related allowance recorded | 68,436,000 |  | 68,436,000 |  | 73,728,000
Related Allowance | 14,997,000 |  | 14,997,000 |  | 4,746,000
Average recorded investment: |  |  |  |  |
Total impaired loans with an allowance recorded | 32,476,000 | 33,715,000 | 30,736,000 | 57,716,000 | 35,076,000
Total impaired loans with no related allowance recorded | 58,267,000 | 48,128,000 | 53,089,000 | 49,061,000 | 65,536,000
Interest Recognized |  |  |  |  |
Total impaired loans with an allowance recorded | 32,000 | 33,000 | 98,000 | 98,000 | 131,000
Total impaired loans with no related allowance recorded | 92,000 | 64,000 | 258,000 | 244,000 | 323,000
Commercial | Class of financing receivable |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with related allowance | 17,880,000 |  | 17,880,000 |  | 1,633,000
Total impaired loans with no related allowance | 17,351,000 |  | 17,351,000 |  | 31,135,000
Unpaid principal balance: |  |  |  |  |
Total impaired loans with an allowance recorded | 17,880,000 |  | 17,880,000 |  | 1,679,000
Total impaired loans with no related allowance recorded | 17,993,000 |  | 17,993,000 |  | 31,170,000
Related Allowance | 10,741,000 |  | 10,741,000 |  | 1,477,000
Average recorded investment: |  |  |  |  |
Total impaired loans with an allowance recorded | 17,884,000 | 22,729,000 | 17,898,000 | 22,517,000 | 21,126,000
Total impaired loans with no related allowance recorded | 17,238,000 | 840,000 | 16,915,000 | 538,000 | 2,996,000
Interest Recognized |  |  |  |  |
Total impaired loans with an allowance recorded | 9,000 | 10,000 | 29,000 | 29,000 | 39,000
Total impaired loans with no related allowance recorded |  | 1,000 |  | 3,000 | 4,000
Commercial real estate: other construction and land development | Class of financing receivable |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with related allowance | 6,819,000 |  | 6,819,000 |  | 3,671,000
Total impaired loans with no related allowance | 29,485,000 |  | 29,485,000 |  | 24,989,000
Unpaid principal balance: |  |  |  |  |
Total impaired loans with an allowance recorded | 6,825,000 |  | 6,825,000 |  | 3,671,000
Total impaired loans with no related allowance recorded | 29,542,000 |  | 29,542,000 |  | 25,160,000
Related Allowance | 852,000 |  | 852,000 |  | 539,000
Average recorded investment: |  |  |  |  |
Total impaired loans with an allowance recorded | 6,821,000 | 3,671,000 | 5,804,000 | 23,479,000 | 6,608,000
Total impaired loans with no related allowance recorded | 22,414,000 | 26,689,000 | 20,788,000 | 27,632,000 | 39,449,000
Interest Recognized |  |  |  |  |
Total impaired loans with no related allowance recorded | 17,000 | 23,000 | 53,000 | 122,000 | 141,000
Commercial real estate: farmland and commercial | Class of financing receivable |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with related allowance | 7,751,000 |  | 7,751,000 |  | 6,678,000
Total impaired loans with no related allowance | 9,287,000 |  | 9,287,000 |  | 7,267,000
Unpaid principal balance: |  |  |  |  |
Total impaired loans with an allowance recorded | 11,133,000 |  | 11,133,000 |  | 9,923,000
Total impaired loans with no related allowance recorded | 10,289,000 |  | 10,289,000 |  | 9,340,000
Related Allowance | 3,404,000 |  | 3,404,000 |  | 2,730,000
Average recorded investment: |  |  |  |  |
Total impaired loans with an allowance recorded | 7,771,000 | 7,117,000 | 7,034,000 | 11,518,000 | 7,342,000
Total impaired loans with no related allowance recorded | 8,775,000 | 14,069,000 | 6,787,000 | 14,850,000 | 16,536,000
Interest Recognized |  |  |  |  |
Total impaired loans with an allowance recorded | 23,000 | 23,000 | 69,000 | 69,000 | 92,000
Total impaired loans with no related allowance recorded |  |  |  | 8,000 | 8,000
Commercial real estate: multifamily | Class of financing receivable |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with no related allowance | 314,000 |  | 314,000 |  | 353,000
Unpaid principal balance: |  |  |  |  |
Total impaired loans with no related allowance recorded | 314,000 |  | 314,000 |  | 353,000
Average recorded investment: |  |  |  |  |
Total impaired loans with no related allowance recorded | 316,000 | 374,000 | 330,000 | 388,000 | 381,000
Residential: first lien | Class of financing receivable |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with no related allowance | 4,984,000 |  | 4,984,000 |  | 3,656,000
Unpaid principal balance: |  |  |  |  |
Total impaired loans with no related allowance recorded | 5,117,000 |  | 5,117,000 |  | 3,984,000
Average recorded investment: |  |  |  |  |
Total impaired loans with an allowance recorded |  | 198,000 |  | 202,000 |
Total impaired loans with no related allowance recorded | 4,878,000 | 2,957,000 | 4,441,000 | 2,485,000 | 2,876,000
Interest Recognized |  |  |  |  |
Total impaired loans with no related allowance recorded | 45,000 | 15,000 | 117,000 | 31,000 | 60,000
Residential: junior lien | Class of financing receivable |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with no related allowance | 3,219,000 |  | 3,219,000 |  | 1,850,000
Unpaid principal balance: |  |  |  |  |
Total impaired loans with no related allowance recorded | 3,238,000 |  | 3,238,000 |  | 1,944,000
Average recorded investment: |  |  |  |  |
Total impaired loans with no related allowance recorded | 2,731,000 | 1,836,000 | 2,059,000 | 1,958,000 | 1,939,000
Interest Recognized |  |  |  |  |
Total impaired loans with no related allowance recorded | 25,000 | 25,000 | 74,000 | 79,000 | 104,000
Consumer | Class of financing receivable |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with no related allowance | 1,481,000 |  | 1,481,000 |  | 1,326,000
Unpaid principal balance: |  |  |  |  |
Total impaired loans with no related allowance recorded | 1,486,000 |  | 1,486,000 |  | 1,330,000
Average recorded investment: |  |  |  |  |
Total impaired loans with no related allowance recorded | 1,458,000 | 1,271,000 | 1,313,000 | 1,149,000 | 1,193,000
Foreign | Class of financing receivable |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with no related allowance | 455,000 |  | 455,000 |  | 447,000
Unpaid principal balance: |  |  |  |  |
Total impaired loans with no related allowance recorded | 457,000 |  | 457,000 |  | 447,000
Average recorded investment: |  |  |  |  |
Total impaired loans with no related allowance recorded | 457,000 | 92,000 | 456,000 | 61,000 | 166,000
Interest Recognized |  |  |  |  |
Total impaired loans with no related allowance recorded | $ 5,000 |  | $ 14,000 | $ 1,000 | $ 6,000

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