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Loans, Impaired Financing Receivable (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | $ 21,873 | $ 52,828 | $ 36,332
Unpaid Contractual Principal Balance With An Allowance Recorded | 31,618 | 28,266 | 28,034
Unpaid Contractual Principal Balance, Total | 53,491 | 81,094 | 64,366
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 18,217 | 44,171 | 29,820
Impaired Balance With An Allowance Recorded | 28,355 | 22,536 | 26,278
Impaired Balance, Total | 46,572 | 66,707 | 56,098
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 4,193 | 4,741 | 4,272
Related Allowance, Total | 4,193 | 4,741 | 4,272
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 21,909 | 47,667 | 42,461
Average Recorded Investment With An Allowance Recorded | 25,171 | 20,870 | 22,229
Average Recorded Investment, Total | 47,080 | 68,537 | 64,690
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 195 | 481 | 627
Interest Income Recognized With An Allowance Recorded | 308 | 103 | 621
Interest Income Recognized, Total | 503 | 584 | 1,248
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 225 | 460 | 693
Interest Income Collected With An Allowance Recorded | 310 | 103 | 571
Interest Income Collected, Total | 535 | 563 | 1,264
Commercial [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 174 | 1,546 | 1,508
Unpaid Contractual Principal Balance With An Allowance Recorded | 2,374 | 290 | 1,493
Unpaid Contractual Principal Balance, Total | 2,548 | 1,836 | 3,001
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 172 | 1,456 | 1,042
Impaired Balance With An Allowance Recorded | 2,374 | 290 | 1,493
Impaired Balance, Total | 2,546 | 1,746 | 2,535
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 551 | 300 | 463
Related Allowance, Total | 551 | 300 | 463
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 147 | 1,568 | 1,053
Average Recorded Investment With An Allowance Recorded | 1,919 | 300 | 943
Average Recorded Investment, Total | 2,066 | 1,868 | 1,996
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 4 | 49 | 27
Interest Income Recognized With An Allowance Recorded | 22 | 2 | 92
Interest Income Recognized, Total | 26 | 51 | 119
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 6 | 40 | 28
Interest Income Collected With An Allowance Recorded | 30 | 5 | 88
Interest Income Collected, Total | 36 | 45 | 116
Agricultural [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 0 | 45 | 39
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | 0
Unpaid Contractual Principal Balance, Total | 0 | 45 | 39
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 0 | 45 | 39
Impaired Balance With An Allowance Recorded | 0 | 0 | 0
Impaired Balance, Total | 0 | 45 | 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 | 20 | 42 | 58
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0
Average Recorded Investment, Total | 20 | 42 | 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 | 3,969 | 11,998 | 10,625
Unpaid Contractual Principal Balance With An Allowance Recorded | 11,017 | 17,961 | 8,267
Unpaid Contractual Principal Balance, Total | 14,986 | 29,959 | 18,892
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 1,699 | 9,694 | 6,415
Impaired Balance With An Allowance Recorded | 8,467 | 12,966 | 7,618
Impaired Balance, Total | 10,166 | 22,660 | 14,033
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 1,580 | 2,111 | 1,733
Related Allowance, Total | 1,580 | 2,111 | 1,733
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 3,330 | 11,079 | 9,194
Average Recorded Investment With An Allowance Recorded | 6,578 | 11,954 | 10,534
Average Recorded Investment, Total | 9,908 | 23,033 | 19,728
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 12 | (7) | 27
Interest Income Recognized With An Allowance Recorded | 6 | 0 | 0
Interest Income Recognized, Total | 18 | (7) | 27
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 12 | 4 | 52
Interest Income Collected With An Allowance Recorded | 9 | 0 | 0
Interest Income Collected, Total | 21 | 4 | 52
Commercial Real Estate [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 10,879 | 33,857 | 16,566
Unpaid Contractual Principal Balance With An Allowance Recorded | 13,436 | 5,163 | 12,759
Unpaid Contractual Principal Balance, Total | 24,315 | 39,020 | 29,325
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 10,148 | 28,254 | 15,506
Impaired Balance With An Allowance Recorded | 13,436 | 5,141 | 12,745
Impaired Balance, Total | 23,584 | 33,395 | 28,251
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 1,080 | 1,462 | 1,236
Related Allowance, Total | 1,080 | 1,462 | 1,236
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 12,740 | 30,136 | 26,482
Average Recorded Investment With An Allowance Recorded | 11,677 | 4,394 | 6,399
Average Recorded Investment, Total | 24,417 | 34,530 | 32,881
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 112 | 358 | 430
Interest Income Recognized With An Allowance Recorded | 240 | 55 | 384
Interest Income Recognized, Total | 352 | 413 | 814
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 133 | 325 | 421
Interest Income Collected With An Allowance Recorded | 234 | 53 | 366
Interest Income Collected, Total | 367 | 378 | 787
Residential RE [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 4,327 | 2,748 | 4,450
Unpaid Contractual Principal Balance With An Allowance Recorded | 4,791 | 4,852 | 5,515
Unpaid Contractual Principal Balance, Total | 9,118 | 7,600 | 9,965
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 3,685 | 2,152 | 4,132
Impaired Balance With An Allowance Recorded | 4,078 | 4,139 | 4,422
Impaired Balance, Total | 7,763 | 6,291 | 8,554
Related Allowance [Abstract] |  |  |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 982 | 868 | 840
Related Allowance, Total | 982 | 868 | 840
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 3,033 | 2,280 | 3,096
Average Recorded Investment With An Allowance Recorded | 4,997 | 4,092 | 4,288
Average Recorded Investment, Total | 8,030 | 6,372 | 7,384
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 62 | 46 | 89
Interest Income Recognized With An Allowance Recorded | 40 | 46 | 145
Interest Income Recognized, Total | 102 | 92 | 234
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 67 | 42 | 123
Interest Income Collected With An Allowance Recorded | 37 | 45 | 117
Interest Income Collected, Total | 104 | 87 | 240
Farmland [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 2,307 | 2,340 | 2,829
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | 0
Unpaid Contractual Principal Balance, Total | 2,307 | 2,340 | 2,829
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 2,307 | 2,297 | 2,413
Impaired Balance With An Allowance Recorded | 0 | 0 | 0
Impaired Balance, Total | 2,307 | 2,297 | 2,413
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 | 2,427 | 2,297 | 2,326
Average Recorded Investment With An Allowance Recorded | 0 | 130 | 65
Average Recorded Investment, Total | 2,427 | 2,427 | 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 | 1 | 44 | 55
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0
Interest Income Collected, Total | 1 | 44 | 55
Consumer [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 217 | 256 | 297
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | 0
Unpaid Contractual Principal Balance, Total | 217 | 256 | 297
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 206 | 237 | 255
Impaired Balance With An Allowance Recorded | 0 | 0 | 0
Impaired Balance, Total | 206 | 237 | 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 | 212 | 225 | 228
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0
Average Recorded Investment, Total | 212 | 225 | 228
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 4 | 3 | 10
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0
Interest Income Recognized, Total | 4 | 3 | 10
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 6 | 5 | 13
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0
Interest Income Collected, Total | 6 | 5 | 13
Other [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 0 | 38 | 18
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | 0
Unpaid Contractual Principal Balance, Total | 0 | 38 | 18
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 0 | 36 | 18
Impaired Balance With An Allowance Recorded | 0 | 0 | 0
Impaired Balance, Total | 0 | 36 | 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 | 40 | 24
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0
Average Recorded Investment, Total | 0 | 40 | 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

X
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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