| **Accounting for Certain Loans Acquired in a Purchase** | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| **Receivables [Abstract]**                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Accounting for Certain Loans Acquired in a Purchase     | ACCOUNTING FOR CERTAIN LOANS ACQUIRED IN A PURCHASEThe Bank acquired loans in a purchase during the years ended December 31, 2014, 2013 and 2012.  The acquired loans detailed in the tables below are included in Note 4.  LOANS AND ALLOWANCE, in the Notes to Consolidated Condensed Financial Statements of this Form 10-Q.  As described in Note 4, loans purchased after December 31, 2008 are recorded at the acquisition date fair value, which could result in a fair value discount or premium.  Purchased loans with evidence of credit deterioration since origination and for which it is probable at the date of acquisition that the acquirer will not collect all contractually required principal and interest payments are accounted for under ASC 310-30, Loans Acquired with Deteriorated Credit Quality.  The difference between contractually required payments and the cash flows expected to be collected at acquisition is referred to as the nonaccretable portion of the fair value discount or premium.  The accretable portion of the fair value discount or premium is the difference between the expected cash flows and the net present value of expected cash flows, with such difference accreted into earnings over the term of the loans.  All other loans not accounted for under ASC 310-30 are accounted for under ASC 310-20.The following table includes the outstanding balance and carrying amount of loans acquired during the years ended December 31, 2012, 2013 and 2014, which are included in the balance sheet amounts of loans receivable at March 31, 2015 and December 31, 2014.March 31, 2015December 31, 2014CommunityCFSSCBTotalCommunityCFSSCBTotalCommercial and industrial loans$6,828$58,252$5,673$70,753$8,168$64,897$6,059$79,124Agricultural production financing and other loans to farmers7378771,6141,1008931,993Real estate loans:  Construction19,9697,33427,30319,0639,11328,176Commercial and farmland69,421232,43614,666316,52374,600251,00215,593341,195Residential28,048137,4576,868172,37328,863144,3967,384180,643       Home Equity9,32437,43914,84361,6069,88139,24415,75864,883Individuals' loans for household and other personal expenditures1,056779951,9301,3149221212,357Other Loans84848686Total$135,383$473,781$43,022$652,186$142,989$509,660$45,808$698,457Carrying Amount$126,996$450,867$36,980$614,843$134,198$484,949$39,324$658,471Allowance195285480650650Carrying Amount Net of Allowance$126,801$450,582$36,980$614,363$134,198$484,299$39,324$657,821The balance of the allowance for loan losses for loans acquired and accounted for under ASC 310-30 was $480,000 and $650,000 at March 31, 2015 and December 31, 2014, respectively. As customer cash flow expectations improve, nonaccretable yield can be reclassified to accretable yield. The accretable yield, or income expected to be collected, and reclassifications from nonaccretable yield, are identified in the table below.  The table reflects only purchased loans accounted for under ASC 310-30 and not the entire portfolio of purchased loans.Three Months Ended March 31, 2015 Three Months Ended March 31, 2014CommunityCFSSCBTotalCFSSCBTotalBeginning balance$2,122$2,400$868$5,390$4,164$1,388$5,552AdditionsAccretion(179)(1,341)(185)(1,705)(301)(187)(488)Reclassification from nonaccretable479501351,13225255307Disposals(35)(35)Ending balance$1,990$2,009$818$4,817$4,080$1,256$5,336 |

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| - Definition
The entire disclosure for certain contractual rights to receive money on demand or on fixed or determinable dates with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15029-111544
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| - Details**Name:**us-gaap_ReceivablesAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |