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Allowance for Probable Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Interest Recognized |  |  |  |  |
Total trouble debt restructuring | $ 17,433 |  | $ 17,433 |  | $ 20,358
Period of charge off for past due unsecured commercial loans |  |  | 90 days |  |
Unallocated Financing Receivables [Member] |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with related allowance | 32,430 |  | 32,430 |  | 31,255
Total impaired loans with no related allowance | 45,537 |  | 45,537 |  | 44,638
Unpaid principal balance: |  |  |  |  |
Total impaired loans with an allowance recorded | 32,860 |  | 32,860 |  | 34,699
Total impaired loans with no related allowance recorded | 47,071 |  | 47,071 |  | 45,986
Related Allowance | 21,308 |  | 21,308 |  | 16,002
Average recorded investment: |  |  |  |  |
Total impaired loans with an allowance recorded | 32,525 | 32,476 | 31,715 | 30,736 | 31,244
Total impaired loans with no related allowance recorded | 44,599 | 58,267 | 44,532 | 53,089 | 51,616
Interest Recognized |  |  |  |  |
Total impaired loans with an allowance recorded | 23 | 32 | 69 | 98 | 130
Total impaired loans with no related allowance recorded | 112 | 92 | 336 | 258 | 374
Commercial Loan [Member] |  |  |  |  |
Interest Recognized |  |  |  |  |
Total trouble debt restructuring | 2,512 |  | 2,512 |  | 150
Commercial Loan [Member] | Unallocated Financing Receivables [Member] |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with related allowance | 17,659 |  | 17,659 |  | 17,178
Total impaired loans with no related allowance | 22,536 |  | 22,536 |  | 17,005
Unpaid principal balance: |  |  |  |  |
Total impaired loans with an allowance recorded | 17,685 |  | 17,685 |  | 17,177
Total impaired loans with no related allowance recorded | 22,606 |  | 22,606 |  | 17,023
Related Allowance | 16,302 |  | 16,302 |  | 12,234
Average recorded investment: |  |  |  |  |
Total impaired loans with an allowance recorded | 17,677 | 17,884 | 17,550 | 17,898 | 18,019
Total impaired loans with no related allowance recorded | 21,265 | 17,238 | 19,557 | 16,915 | 16,778
Interest Recognized |  |  |  |  |
Total impaired loans with an allowance recorded |  | 9 |  | 29 | 38
Total impaired loans with no related allowance recorded | 1 |  | 3 |  | 2
Commercial Real Estate Other Construction and Land Development Receivable [Member] |  |  |  |  |
Interest Recognized |  |  |  |  |
Total trouble debt restructuring | 2,255 |  | 2,255 |  | 8,860
Commercial Real Estate Other Construction and Land Development Receivable [Member] | Unallocated Financing Receivables [Member] |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with related allowance | 7,344 |  | 7,344 |  | 6,818
Total impaired loans with no related allowance | 4,191 |  | 4,191 |  | 7,158
Unpaid principal balance: |  |  |  |  |
Total impaired loans with an allowance recorded | 7,386 |  | 7,386 |  | 6,825
Total impaired loans with no related allowance recorded | 4,262 |  | 4,262 |  | 7,187
Related Allowance | 2,022 |  | 2,022 |  | 852
Average recorded investment: |  |  |  |  |
Total impaired loans with an allowance recorded | 7,329 | 6,821 | 7,326 | 5,804 | 6,058
Total impaired loans with no related allowance recorded | 4,192 | 22,414 | 5,121 | 20,788 | 18,164
Interest Recognized |  |  |  |  |
Total impaired loans with no related allowance recorded | 19 | 17 | 56 | 53 | 74
Commercial Real Estate Farmland and Commercial Receivable [Member] |  |  |  |  |
Interest Recognized |  |  |  |  |
Total trouble debt restructuring | 4,556 |  | 4,556 |  | 2,863
Commercial Real Estate Farmland and Commercial Receivable [Member] | Unallocated Financing Receivables [Member] |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with related allowance | 7,427 |  | 7,427 |  | 7,259
Total impaired loans with no related allowance | 8,344 |  | 8,344 |  | 8,779
Unpaid principal balance: |  |  |  |  |
Total impaired loans with an allowance recorded | 7,789 |  | 7,789 |  | 10,697
Total impaired loans with no related allowance recorded | 9,664 |  | 9,664 |  | 9,949
Related Allowance | 2,984 |  | 2,984 |  | 2,916
Average recorded investment: |  |  |  |  |
Total impaired loans with an allowance recorded | 7,519 | 7,771 | 6,839 | 7,034 | 7,167
Total impaired loans with no related allowance recorded | 8,418 | 8,775 | 8,643 | 6,787 | 7,313
Interest Recognized |  |  |  |  |
Total impaired loans with an allowance recorded | 23 | 23 | 69 | 69 | 92
Commercial Real Estate Multifamily Receivable [Member] | Unallocated Financing Receivables [Member] |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with no related allowance | 251 |  | 251 |  | 295
Unpaid principal balance: |  |  |  |  |
Total impaired loans with no related allowance recorded | 251 |  | 251 |  | 295
Average recorded investment: |  |  |  |  |
Total impaired loans with no related allowance recorded | 256 | 316 | 270 | 330 | 322
Residential First Mortgage Financing Receivable [Member] |  |  |  |  |
Interest Recognized |  |  |  |  |
Total trouble debt restructuring | 4,941 |  | 4,941 |  | 4,887
Residential First Mortgage Financing Receivable [Member] | Unallocated Financing Receivables [Member] |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with no related allowance | 5,457 |  | 5,457 |  | 6,153
Unpaid principal balance: |  |  |  |  |
Total impaired loans with no related allowance recorded | 5,507 |  | 5,507 |  | 6,258
Average recorded investment: |  |  |  |  |
Total impaired loans with no related allowance recorded | 5,648 | 4,878 | 6,028 | 4,441 | 4,860
Interest Recognized |  |  |  |  |
Total impaired loans with no related allowance recorded | 64 | 45 | 191 | 117 | 179
Residential Second Mortgage Financing Receivable [Member] |  |  |  |  |
Interest Recognized |  |  |  |  |
Total trouble debt restructuring | 1,384 |  | 1,384 |  | 1,631
Residential Second Mortgage Financing Receivable [Member] | Unallocated Financing Receivables [Member] |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with no related allowance | 2,933 |  | 2,933 |  | 3,206
Unpaid principal balance: |  |  |  |  |
Total impaired loans with no related allowance recorded | 2,954 |  | 2,954 |  | 3,226
Average recorded investment: |  |  |  |  |
Total impaired loans with no related allowance recorded | 2,992 | 2,731 | 3,080 | 2,059 | 2,347
Interest Recognized |  |  |  |  |
Total impaired loans with no related allowance recorded | 22 | 25 | 69 | 74 | 99
Consumer Loan [Member] |  |  |  |  |
Interest Recognized |  |  |  |  |
Total trouble debt restructuring | 1,368 |  | 1,368 |  | 1,531
Consumer Loan [Member] | Unallocated Financing Receivables [Member] |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with no related allowance | 1,408 |  | 1,408 |  | 1,606
Unpaid principal balance: |  |  |  |  |
Total impaired loans with no related allowance recorded | 1,410 |  | 1,410 |  | 1,612
Average recorded investment: |  |  |  |  |
Total impaired loans with no related allowance recorded | 1,408 | 1,458 | 1,407 | 1,313 | 1,380
Interest Recognized |  |  |  |  |
Total impaired loans with no related allowance recorded | 1 |  | 3 |  | 1
Foreign Receivables [Member] |  |  |  |  |
Interest Recognized |  |  |  |  |
Total trouble debt restructuring | 417 |  | 417 |  | 436
Foreign Receivables [Member] | Unallocated Financing Receivables [Member] |  |  |  |  |
Recorded investment: |  |  |  |  |
Total impaired loans with no related allowance | 417 |  | 417 |  | 436
Unpaid principal balance: |  |  |  |  |
Total impaired loans with no related allowance recorded | 417 |  | 417 |  | 436
Average recorded investment: |  |  |  |  |
Total impaired loans with no related allowance recorded | 420 | 457 | 426 | 456 | 452
Interest Recognized |  |  |  |  |
Total impaired loans with no related allowance recorded | $ 5 | $ 5 | $ 14 | $ 14 | $ 19

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