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Loans, Impaired Financing Receivable (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | $ 30,255 |  | $ 36,332
Unpaid Contractual Principal Balance With An Allowance Recorded | 23,840 |  | 28,034
Unpaid Contractual Principal Balance, Total | 54,095 |  | 64,366
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 25,601 | 51,159 | 29,820
Impaired Balance With An Allowance Recorded | 21,988 | 19,204 | 26,278
Impaired Balance, Total | 47,589 | 70,363 | 56,098
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 4,493 | 4,882 | 4,272
Related Allowance, Total | 4,493 | 4,882 | 4,272
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 25,601 | 51,159 | 42,461
Average Recorded Investment With An Allowance Recorded | 21,988 | 19,204 | 22,229
Average Recorded Investment, Total | 47,589 | 70,363 | 64,690
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 118 | 383 | 627
Interest Income Recognized With An Allowance Recorded | 133 | 38 | 621
Interest Income Recognized, Total | 251 | 421 | 1,248
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 161 | 347 | 693
Interest Income Collected With An Allowance Recorded | 145 | 51 | 571
Interest Income Collected, Total | 306 | 398 | 1,264
Commercial [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 264 |  | 1,508
Unpaid Contractual Principal Balance With An Allowance Recorded | 1,465 |  | 1,493
Unpaid Contractual Principal Balance, Total | 1,729 |  | 3,001
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 122 | 1,679 | 1,042
Impaired Balance With An Allowance Recorded | 1,465 | 310 | 1,493
Impaired Balance, Total | 1,587 | 1,989 | 2,535
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 456 | 304 | 463
Related Allowance, Total | 456 | 304 | 463
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 122 | 1,679 | 1,053
Average Recorded Investment With An Allowance Recorded | 1,465 | 310 | 943
Average Recorded Investment, Total | 1,587 | 1,989 | 1,996
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 3 | 25 | 27
Interest Income Recognized With An Allowance Recorded | 20 | 2 | 92
Interest Income Recognized, Total | 23 | 27 | 119
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 4 | 26 | 28
Interest Income Collected With An Allowance Recorded | 17 | 5 | 88
Interest Income Collected, Total | 21 | 31 | 116
Agricultural [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 39 |  | 39
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 |  | 0
Unpaid Contractual Principal Balance, Total | 39 |  | 39
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 39 | 39 | 39
Impaired Balance With An Allowance Recorded | 0 | 0 | 0
Impaired Balance, Total | 39 | 39 | 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 | 39 | 39 | 58
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0
Average Recorded Investment, Total | 39 | 39 | 58
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
Commercial Construction [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 9,002 |  | 10,625
Unpaid Contractual Principal Balance With An Allowance Recorded | 5,339 |  | 8,267
Unpaid Contractual Principal Balance, Total | 14,341 |  | 18,892
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 4,962 | 12,463 | 6,415
Impaired Balance With An Allowance Recorded | 4,690 | 10,942 | 7,618
Impaired Balance, Total | 9,652 | 23,405 | 14,033
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 1,493 | 2,755 | 1,733
Related Allowance, Total | 1,493 | 2,755 | 1,733
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 4,962 | 12,463 | 9,194
Average Recorded Investment With An Allowance Recorded | 4,690 | 10,942 | 10,534
Average Recorded Investment, Total | 9,652 | 23,405 | 19,728
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 4 | 1 | 27
Interest Income Recognized With An Allowance Recorded | 0 | (9) | 0
Interest Income Recognized, Total | 4 | (8) | 27
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 5 | 4 | 52
Interest Income Collected With An Allowance Recorded | 1 | 0 | 0
Interest Income Collected, Total | 6 | 4 | 52
Commercial Real Estate [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 15,405 |  | 16,566
Unpaid Contractual Principal Balance With An Allowance Recorded | 10,077 |  | 12,759
Unpaid Contractual Principal Balance, Total | 25,482 |  | 29,325
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 15,331 | 32,018 | 15,506
Impaired Balance With An Allowance Recorded | 9,917 | 3,647 | 12,745
Impaired Balance, Total | 25,248 | 35,665 | 28,251
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 1,426 | 1,023 | 1,236
Related Allowance, Total | 1,426 | 1,023 | 1,236
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 15,331 | 32,018 | 26,482
Average Recorded Investment With An Allowance Recorded | 9,917 | 3,647 | 6,399
Average Recorded Investment, Total | 25,248 | 35,665 | 32,881
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 102 | 300 | 430
Interest Income Recognized With An Allowance Recorded | 73 | 20 | 384
Interest Income Recognized, Total | 175 | 320 | 814
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 129 | 296 | 421
Interest Income Collected With An Allowance Recorded | 91 | 20 | 366
Interest Income Collected, Total | 220 | 316 | 787
Residential Real Estate [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 2,726 |  | 4,450
Unpaid Contractual Principal Balance With An Allowance Recorded | 6,959 |  | 5,515
Unpaid Contractual Principal Balance, Total | 9,685 |  | 9,965
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 2,382 | 2,407 | 4,132
Impaired Balance With An Allowance Recorded | 5,916 | 4,045 | 4,422
Impaired Balance, Total | 8,298 | 6,452 | 8,554
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 1,118 | 788 | 840
Related Allowance, Total | 1,118 | 788 | 840
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 2,382 | 2,407 | 3,096
Average Recorded Investment With An Allowance Recorded | 5,916 | 4,045 | 4,288
Average Recorded Investment, Total | 8,298 | 6,452 | 7,384
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 10 | 23 | 89
Interest Income Recognized With An Allowance Recorded | 40 | 25 | 145
Interest Income Recognized, Total | 50 | 48 | 234
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 18 | 18 | 123
Interest Income Collected With An Allowance Recorded | 36 | 26 | 117
Interest Income Collected, Total | 54 | 44 | 240
Farmland [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 2,590 |  | 2,829
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 |  | 0
Unpaid Contractual Principal Balance, Total | 2,590 |  | 2,829
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 2,548 | 2,297 | 2,413
Impaired Balance With An Allowance Recorded | 0 | 260 | 0
Impaired Balance, Total | 2,548 | 2,557 | 2,413
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 0 | 12 | 0
Related Allowance, Total | 0 | 12 | 0
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 2,548 | 2,297 | 2,326
Average Recorded Investment With An Allowance Recorded | 0 | 260 | 65
Average Recorded Investment, Total | 2,548 | 2,557 | 2,391
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | (1) | 32 | 43
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0
Interest Income Recognized, Total | (1) | 32 | 43
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 3 | 0 | 55
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0
Interest Income Collected, Total | 3 | 0 | 55
Consumer [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 229 |  | 297
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 |  | 0
Unpaid Contractual Principal Balance, Total | 229 |  | 297
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 217 | 212 | 255
Impaired Balance With An Allowance Recorded | 0 | 0 | 0
Impaired Balance, Total | 217 | 212 | 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 | 217 | 212 | 228
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0
Average Recorded Investment, Total | 217 | 212 | 228
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 0 | 2 | 10
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0
Interest Income Recognized, Total | 0 | 2 | 10
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 2 | 3 | 13
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0
Interest Income Collected, Total | 2 | 3 | 13
Other [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 0 |  | 18
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 |  | 0
Unpaid Contractual Principal Balance, Total | 0 |  | 18
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 0 | 44 | 18
Impaired Balance With An Allowance Recorded | 0 | 0 | 0
Impaired Balance, Total | 0 | 44 | 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 | 44 | 24
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0
Average Recorded Investment, Total | 0 | 44 | 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
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 |  | 0
Unpaid Contractual Principal Balance, Total | 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