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Loans, Impaired Financing Receivable (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | $ 27,110 | $ 52,977 | $ 36,332
Unpaid Contractual Principal Balance With An Allowance Recorded | 26,583 | 24,057 | 28,034
Unpaid Contractual Principal Balance, Total | 53,693 | 77,034 | 64,366
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 21,727 | 44,699 | 29,820
Impaired Balance With An Allowance Recorded | 24,132 | 20,893 | 26,278
Impaired Balance, Total | 45,859 | 65,592 | 56,098
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 3,216 | 4,214 | 4,272
Related Allowance, Total | 3,216 | 4,214 | 4,272
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 14,605 | 46,676 | 42,461
Average Recorded Investment With An Allowance Recorded | 16,782 | 20,878 | 22,229
Average Recorded Investment, Total | 31,387 | 67,554 | 64,690
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 292 | 793 | 627
Interest Income Recognized With An Allowance Recorded | 410 | 264 | 621
Interest Income Recognized, Total | 702 | 1,057 | 1,248
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 316 | 837 | 693
Interest Income Collected With An Allowance Recorded | 415 | 262 | 571
Interest Income Collected, Total | 731 | 1,099 | 1,264
Commercial [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 266 | 85 | 1,508
Unpaid Contractual Principal Balance With An Allowance Recorded | 1,465 | 1,677 | 1,493
Unpaid Contractual Principal Balance, Total | 1,731 | 1,762 | 3,001
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 265 | 34 | 1,042
Impaired Balance With An Allowance Recorded | 1,465 | 1,677 | 1,493
Impaired Balance, Total | 1,730 | 1,711 | 2,535
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 108 | 514 | 463
Related Allowance, Total | 108 | 514 | 463
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 98 | 1,056 | 1,053
Average Recorded Investment With An Allowance Recorded | 1,280 | 759 | 943
Average Recorded Investment, Total | 1,378 | 1,815 | 1,996
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 11 | 4 | 27
Interest Income Recognized With An Allowance Recorded | 14 | 69 | 92
Interest Income Recognized, Total | 25 | 73 | 119
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 14 | 2 | 28
Interest Income Collected With An Allowance Recorded | 19 | 64 | 88
Interest Income Collected, Total | 33 | 66 | 116
Agricultural [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 0 | 109 | 39
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | 0
Unpaid Contractual Principal Balance, Total | 0 | 109 | 39
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 0 | 109 | 39
Impaired Balance With An Allowance Recorded | 0 | 0 | 0
Impaired Balance, Total | 0 | 109 | 39
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 0 | 0 | 0
Related Allowance, Total | 0 | 0 | 0
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 13 | 64 | 58
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0
Average Recorded Investment, Total | 13 | 64 | 58
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 0 | 8 | 0
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0
Interest Income Recognized, Total | 0 | 8 | 0
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 0 | 18 | 0
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0
Interest Income Collected, Total | 0 | 18 | 0
Commercial Construction [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 8,335 | 10,527 | 10,625
Unpaid Contractual Principal Balance With An Allowance Recorded | 5,924 | 12,331 | 8,267
Unpaid Contractual Principal Balance, Total | 14,259 | 22,858 | 18,892
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 5,010 | 8,205 | 6,415
Impaired Balance With An Allowance Recorded | 3,473 | 10,610 | 7,618
Impaired Balance, Total | 8,483 | 18,815 | 14,033
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 573 | 1,786 | 1,733
Related Allowance, Total | 573 | 1,786 | 1,733
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 2,220 | 10,121 | 9,194
Average Recorded Investment With An Allowance Recorded | 4,386 | 11,506 | 10,534
Average Recorded Investment, Total | 6,606 | 21,627 | 19,728
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 17 | (9) | 27
Interest Income Recognized With An Allowance Recorded | 0 | 1 | 0
Interest Income Recognized, Total | 17 | (8) | 27
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 23 | 1 | 52
Interest Income Collected With An Allowance Recorded | 0 | 4 | 0
Interest Income Collected, Total | 23 | 5 | 52
Commercial Real Estate [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 8,559 | 35,399 | 16,566
Unpaid Contractual Principal Balance With An Allowance Recorded | 15,061 | 4,789 | 12,759
Unpaid Contractual Principal Balance, Total | 23,620 | 40,188 | 29,325
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 8,064 | 30,152 | 15,506
Impaired Balance With An Allowance Recorded | 15,061 | 4,059 | 12,745
Impaired Balance, Total | 23,125 | 34,211 | 28,251
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 1,559 | 864 | 1,236
Related Allowance, Total | 1,559 | 864 | 1,236
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 8,493 | 30,141 | 26,482
Average Recorded Investment With An Allowance Recorded | 7,785 | 4,282 | 6,399
Average Recorded Investment, Total | 16,278 | 34,423 | 32,881
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 95 | 670 | 430
Interest Income Recognized With An Allowance Recorded | 287 | 115 | 384
Interest Income Recognized, Total | 382 | 785 | 814
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 113 | 667 | 421
Interest Income Collected With An Allowance Recorded | 285 | 116 | 366
Interest Income Collected, Total | 398 | 783 | 787
Residential Real Estate [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 7,378 | 4,291 | 4,450
Unpaid Contractual Principal Balance With An Allowance Recorded | 2,804 | 5,260 | 5,515
Unpaid Contractual Principal Balance, Total | 10,182 | 9,551 | 9,965
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 5,830 | 3,694 | 4,132
Impaired Balance With An Allowance Recorded | 2,804 | 4,547 | 4,422
Impaired Balance, Total | 8,634 | 8,241 | 8,554
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 774 | 1,050 | 840
Related Allowance, Total | 774 | 1,050 | 840
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 2,022 | 2,751 | 3,096
Average Recorded Investment With An Allowance Recorded | 3,331 | 4,244 | 4,288
Average Recorded Investment, Total | 5,353 | 6,995 | 7,384
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 157 | 84 | 89
Interest Income Recognized With An Allowance Recorded | 65 | 79 | 145
Interest Income Recognized, Total | 222 | 163 | 234
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 152 | 99 | 123
Interest Income Collected With An Allowance Recorded | 64 | 78 | 117
Interest Income Collected, Total | 216 | 177 | 240
Farmland [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 2,277 | 2,340 | 2,829
Unpaid Contractual Principal Balance With An Allowance Recorded | 1,329 | 0 | 0
Unpaid Contractual Principal Balance, Total | 3,606 | 2,340 | 2,829
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 2,277 | 2,297 | 2,413
Impaired Balance With An Allowance Recorded | 1,329 | 0 | 0
Impaired Balance, Total | 3,606 | 2,297 | 2,413
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 202 | 0 | 0
Related Allowance, Total | 202 | 0 | 0
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 1,618 | 2,297 | 2,326
Average Recorded Investment With An Allowance Recorded | 0 | 87 | 65
Average Recorded Investment, Total | 1,618 | 2,384 | 2,391
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 0 | 31 | 43
Interest Income Recognized With An Allowance Recorded | 44 | 0 | 0
Interest Income Recognized, Total | 44 | 31 | 43
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 0 | 44 | 55
Interest Income Collected With An Allowance Recorded | 47 | 0 | 0
Interest Income Collected, Total | 47 | 44 | 55
Consumer [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 295 | 226 | 297
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | 0
Unpaid Contractual Principal Balance, Total | 295 | 226 | 297
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 281 | 208 | 255
Impaired Balance With An Allowance Recorded | 0 | 0 | 0
Impaired Balance, Total | 281 | 208 | 255
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 0 | 0 | 0
Related Allowance, Total | 0 | 0 | 0
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 141 | 219 | 228
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0
Average Recorded Investment, Total | 141 | 219 | 228
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 12 | 5 | 10
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0
Interest Income Recognized, Total | 12 | 5 | 10
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 14 | 6 | 13
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0
Interest Income Collected, Total | 14 | 6 | 13
Other [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 0 | 0 | 18
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | 0
Unpaid Contractual Principal Balance, Total | 0 | 0 | 18
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 0 | 0 | 18
Impaired Balance With An Allowance Recorded | 0 | 0 | 0
Impaired Balance, Total | 0 | 0 | 18
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 0 | 0 | 0
Related Allowance, Total | 0 | 0 | 0
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 0 | 27 | 24
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0
Average Recorded Investment, Total | 0 | 27 | 24
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 0 | 0 | 1
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0
Interest Income Recognized, Total | 0 | 0 | 1
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 0 | 0 | 1
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0
Interest Income Collected, Total | 0 | 0 | 1
Residential Construction [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 0 | 0 | 0
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | 0
Unpaid Contractual Principal Balance, Total | 0 | 0 | 0
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 0 | 0 | 0
Impaired Balance With An Allowance Recorded | 0 | 0 | 0
Impaired Balance, Total | 0 | 0 | 0
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 0 | 0 | 0
Related Allowance, Total | 0 | 0 | 0
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 0 | 0 | 0
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0
Average Recorded Investment, Total | 0 | 0 | 0
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 0 | 0 | 0
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0
Interest Income Recognized, Total | 0 | 0 | 0
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 0 | 0 | 0
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0
Interest Income Collected, Total | $ 0 | $ 0 | $ 0

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524 + Details
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- Definition Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant