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Loans and Allowance for Loan Losses, Part II (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Loans Receivable Aging Analysis [Abstract]          
Total Past Due $ 8,773,000   $ 8,773,000   $ 8,185,000
Current 1,816,861,000   1,816,861,000   1,817,807,000
Total Loans Receivable 1,825,634,000 $ 1,315,187,000 1,825,634,000 $ 1,315,187,000 1,825,992,000
Total Loans 90 Days & Accruing 0   $ 0   105,000
Number of days past due when interest is not accrued     ninety days    
Period of satisfactory performance before returning to accrual status     not less than six months    
Loans with a specific allowance [Abstract]          
Recorded Balance 7,656,000   $ 7,656,000   5,266,000
Unpaid Principal Balance 9,033,000   9,033,000   5,385,000
Specific Allowance 242,000   242,000   858,000
Loans without a specific allowance [Abstract]          
Recorded Balance 9,469,000   9,469,000   12,972,000
Unpaid Principal Balance 9,906,000   9,906,000   14,612,000
Total Loans [Abstract]          
Recorded Balance 17,125,000   17,125,000   18,238,000
Unpaid Principal Balance 18,939,000   18,939,000   19,997,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 17,968,000 5,096,000 16,333,000 5,219,000  
Interest income recognized 190,000 5,000 277,000 9,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 11,014,000   11,014,000   12,053,000
Interest Lost on Nonaccrual Loans     140,000 $ 80,000  
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 9,323,000   9,323,000   10,889,000
Financing Receivable Modifications Performing Recorded Investment 6,111,000   $ 6,111,000   6,185,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     1 5  
Financing Receivables, Modifications during Period, Balance     $ 819,000 $ 357,000  
Subsequent Default, Number of Days Past Due     90 days    
Real Estate Acquired Through Foreclosure 2,689,000   $ 2,689,000   1,982,000
Other Repossessed Assets 1,700,000   1,700,000    
Mortgage Loans Secured By Real Estate In Foreclosure     606,000   661,000
Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 1,735,859,000   1,735,859,000   1,769,460,000
Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 49,566,000   49,566,000   27,653,000
Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 40,209,000   40,209,000   28,879,000
Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Construction and land development          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Current 68,681,000   68,681,000   49,104,000
Total Loans Receivable 68,681,000   68,681,000   49,104,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 593,000   593,000   227,000
Unpaid Principal Balance 593,000   593,000   227,000
Specific Allowance 0   0   0
Loans without a specific allowance [Abstract]          
Recorded Balance 0   0   0
Unpaid Principal Balance 0   0   0
Total Loans [Abstract]          
Recorded Balance 593,000   593,000   227,000
Unpaid Principal Balance 593,000   593,000   227,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 594,000 580,000 347,000 632,000  
Interest income recognized 0 0 0 $ 0  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 593,000   593,000   227,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 0   $ 0   227,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     0 1  
Financing Receivables, Modifications during Period, Balance     $ 0 $ 234,000  
Construction and land development | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 68,088,000   68,088,000   48,877,000
Construction and land development | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Construction and land development | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 593,000   593,000   227,000
Construction and land development | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Agricultural real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 640,000   640,000   424,000
Current 122,780,000   122,780,000   125,684,000
Total Loans Receivable 123,420,000   123,420,000   126,108,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 0   0   0
Unpaid Principal Balance 0   0   0
Specific Allowance 0   0   0
Loans without a specific allowance [Abstract]          
Recorded Balance 16,000   16,000   205,000
Unpaid Principal Balance 17,000   17,000   207,000
Total Loans [Abstract]          
Recorded Balance 16,000   16,000   205,000
Unpaid Principal Balance 17,000   17,000   207,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 16,000 450,000 17,000 450,000  
Interest income recognized 0 0 0 0  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 16,000   16,000   205,000
Agricultural real estate | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 117,180,000   117,180,000   118,934,000
Agricultural real estate | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 5,213,000   5,213,000   5,190,000
Agricultural real estate | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 1,027,000   1,027,000   1,984,000
Agricultural real estate | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
1-4 Family residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 2,754,000   2,754,000   3,575,000
Current 307,768,000   307,768,000   322,840,000
Total Loans Receivable 310,522,000   310,522,000   326,415,000
Total Loans 90 Days & Accruing 0   0   105,000
Loans with a specific allowance [Abstract]          
Recorded Balance 1,494,000   1,494,000   997,000
Unpaid Principal Balance 1,762,000   1,762,000   997,000
Specific Allowance 47,000   47,000   6,000
Loans without a specific allowance [Abstract]          
Recorded Balance 1,403,000   1,403,000   2,497,000
Unpaid Principal Balance 1,869,000   1,869,000   3,207,000
Total Loans [Abstract]          
Recorded Balance 2,897,000   2,897,000   3,494,000
Unpaid Principal Balance 3,631,000   3,631,000   4,204,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 2,929,000 1,244,000 3,121,000 1,264,000  
Interest income recognized 106,000 4,000 117,000 8,000  
Loans Receivable, Modifications, Still Accruing Interest 594,000 253,000 594,000 $ 253,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 2,302,000   2,302,000   2,890,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 909,000   909,000   1,753,000
Financing Receivable Modifications Performing Recorded Investment 594,000   $ 594,000   603,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     0 1  
Financing Receivables, Modifications during Period, Balance     $ 0 $ 48,000  
1-4 Family residential properties | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 299,314,000   299,314,000   318,921,000
1-4 Family residential properties | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 2,623,000   2,623,000   918,000
1-4 Family residential properties | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 8,585,000   8,585,000   6,576,000
1-4 Family residential properties | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Multifamily residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 98,000   98,000   240,000
Current 72,394,000   72,394,000   82,960,000
Total Loans Receivable 72,492,000   72,492,000   83,200,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 605,000   605,000   528,000
Unpaid Principal Balance 605,000   605,000   528,000
Specific Allowance 0   0   0
Loans without a specific allowance [Abstract]          
Recorded Balance 3,395,000   3,395,000   3,419,000
Unpaid Principal Balance 3,395,000   3,395,000   3,547,000
Total Loans [Abstract]          
Recorded Balance 4,000,000   4,000,000   3,947,000
Unpaid Principal Balance 4,000,000   4,000,000   4,075,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 4,129,000 305,000 4,133,000 307,000  
Interest income recognized 51,000 0 94,000 0  
Loans Receivable, Modifications, Still Accruing Interest 3,395,000   3,395,000    
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 605,000   605,000   528,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 3,395,000   3,395,000   3,419,000
Financing Receivable Modifications Performing Recorded Investment 3,395,000   3,395,000   3,419,000
Multifamily residential properties | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 67,002,000   67,002,000   81,018,000
Multifamily residential properties | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 1,618,000   1,618,000   1,651,000
Multifamily residential properties | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 3,872,000   3,872,000   531,000
Multifamily residential properties | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Commercial real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 3,220,000   3,220,000   2,421,000
Current 629,272,000   629,272,000   627,714,000
Total Loans Receivable 632,492,000   632,492,000   630,135,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 3,589,000   3,589,000   863,000
Unpaid Principal Balance 3,703,000   3,703,000   884,000
Specific Allowance 78,000   78,000   0
Loans without a specific allowance [Abstract]          
Recorded Balance 2,924,000   2,924,000   6,224,000
Unpaid Principal Balance 3,154,000   3,154,000   6,802,000
Total Loans [Abstract]          
Recorded Balance 6,513,000   6,513,000   7,087,000
Unpaid Principal Balance 6,857,000   6,857,000   7,686,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 7,068,000 1,132,000 5,316,000 1,133,000  
Interest income recognized 31,000 1,000 62,000 1,000  
Loans Receivable, Modifications, Still Accruing Interest 2,087,000 34,000 2,087,000 34,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 4,426,000   4,426,000   4,971,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 3,032,000   3,032,000   4,125,000
Financing Receivable Modifications Performing Recorded Investment 2,087,000   2,087,000   2,116,000
Commercial real estate | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 594,806,000   594,806,000   610,025,000
Commercial real estate | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 17,160,000   17,160,000   5,229,000
Commercial real estate | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 20,526,000   20,526,000   14,881,000
Commercial real estate | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Agricultural loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,130,000   1,130,000   486,000
Current 78,629,000   78,629,000   86,199,000
Total Loans Receivable 79,759,000   79,759,000   86,685,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 261,000   261,000   1,345,000
Unpaid Principal Balance 1,071,000   1,071,000   1,345,000
Specific Allowance 0   0   660,000
Loans without a specific allowance [Abstract]          
Recorded Balance 565,000   565,000   43,000
Unpaid Principal Balance 7,000   7,000   66,000
Total Loans [Abstract]          
Recorded Balance 826,000   826,000   1,388,000
Unpaid Principal Balance 1,078,000   1,078,000   1,411,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 826,000 15,000 930,000 16,000  
Interest income recognized 0 0 0 0  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 826,000   826,000   1,388,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 819,000   $ 819,000   0
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     1    
Financing Receivables, Modifications during Period, Balance     $ 819,000    
Agricultural loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 74,333,000   74,333,000   81,922,000
Agricultural loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 2,534,000   2,534,000   3,271,000
Agricultural loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 2,892,000   2,892,000   1,492,000
Agricultural loans | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Commercial and industrial loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 680,000   680,000   799,000
Current 420,600,000   420,600,000   408,234,000
Total Loans Receivable 421,280,000   421,280,000   409,033,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 866,000   866,000   1,093,000
Unpaid Principal Balance 1,051,000   1,051,000   1,191,000
Specific Allowance 116,000   116,000   192,000
Loans without a specific allowance [Abstract]          
Recorded Balance 1,086,000   1,086,000   378,000
Unpaid Principal Balance 1,374,000   1,374,000   572,000
Total Loans [Abstract]          
Recorded Balance 1,952,000   1,952,000   1,471,000
Unpaid Principal Balance 2,425,000   2,425,000   1,763,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 1,781,000 1,100,000 1,841,000 1,143,000  
Interest income recognized 2,000 0 4,000 0  
Loans Receivable, Modifications, Still Accruing Interest 33,000 22,000 33,000 $ 22,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 1,622,000   1,622,000   1,430,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 920,000   920,000   1,040,000
Financing Receivable Modifications Performing Recorded Investment 33,000   $ 33,000   41,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     0 3  
Financing Receivables, Modifications during Period, Balance     $ 0 $ 75,000  
Commercial and industrial loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 401,352,000   401,352,000   397,762,000
Commercial and industrial loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 17,648,000   17,648,000   8,485,000
Commercial and industrial loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 2,280,000   2,280,000   2,786,000
Commercial and industrial loans | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Consumer loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 251,000   251,000   240,000
Current 32,563,000   32,563,000   37,788,000
Total Loans Receivable 32,814,000   32,814,000   38,028,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 248,000   248,000   213,000
Unpaid Principal Balance 248,000   248,000   213,000
Specific Allowance 1,000   1,000   0
Loans without a specific allowance [Abstract]          
Recorded Balance 80,000   80,000   206,000
Unpaid Principal Balance 90,000   90,000   211,000
Total Loans [Abstract]          
Recorded Balance 328,000   328,000   419,000
Unpaid Principal Balance 338,000   338,000   424,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 625,000 260,000 628,000 264,000  
Interest income recognized 0 0 0 0  
Loans Receivable, Modifications, Still Accruing Interest 2,000 10,000 2,000 10,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 624,000   624,000   414,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 248,000   248,000   325,000
Financing Receivable Modifications Performing Recorded Investment 2,000   2,000   6,000
Consumer loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 32,366,000   32,366,000   37,624,000
Consumer loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 14,000   14,000   17,000
Consumer loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 434,000   434,000   387,000
Consumer loans | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
All other loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Current 84,174,000   84,174,000   77,284,000
Total Loans Receivable 84,174,000   84,174,000   77,284,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 0   0   0
Unpaid Principal Balance 0   0   0
Specific Allowance 0   0   0
Loans without a specific allowance [Abstract]          
Recorded Balance 0   0   0
Unpaid Principal Balance 0   0   0
Total Loans [Abstract]          
Recorded Balance 0   0   0
Unpaid Principal Balance 0   0   0
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 0 10,000      
Interest income recognized 0 0      
All other loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 81,418,000   81,418,000   74,377,000
All other loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 2,756,000   2,756,000   2,892,000
All other loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   15,000
All other loans | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Loans secured by real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 6,712,000   6,712,000   6,660,000
Current 1,200,895,000   1,200,895,000   1,208,302,000
Total Loans Receivable 1,207,607,000   1,207,607,000   1,214,962,000
Total Loans 90 Days & Accruing 0   0   105,000
Loans with a specific allowance [Abstract]          
Recorded Balance 6,281,000   6,281,000   2,615,000
Unpaid Principal Balance 6,663,000   6,663,000   2,636,000
Specific Allowance 125,000   125,000   6,000
Loans without a specific allowance [Abstract]          
Recorded Balance 7,738,000   7,738,000   12,345,000
Unpaid Principal Balance 8,435,000   8,435,000   13,763,000
Total Loans [Abstract]          
Recorded Balance 14,019,000   14,019,000   14,960,000
Unpaid Principal Balance 15,098,000   15,098,000   16,399,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 14,736,000 3,711,000 12,934,000 3,786,000  
Interest income recognized 188,000 $ 5,000 273,000 $ 9,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 7,942,000   7,942,000   8,821,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 7,336,000   7,336,000   9,524,000
Financing Receivable Modifications Performing Recorded Investment 6,076,000   $ 6,076,000   6,138,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     0 2  
Financing Receivables, Modifications during Period, Balance     $ 0 $ 282,000  
Financing Receivables, 30 to 59 Days Past Due [Member]          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 4,965,000   4,965,000   4,468,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction and land development          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 237,000   237,000   0
Financing Receivables, 30 to 59 Days Past Due [Member] | 1-4 Family residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,462,000   1,462,000   1,854,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Multifamily residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,720,000   1,720,000   1,662,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 931,000   931,000   365,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and industrial loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 455,000   455,000   395,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 160,000   160,000   192,000
Financing Receivables, 30 to 59 Days Past Due [Member] | All other loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans secured by real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 3,419,000   3,419,000   3,516,000
Financing Receivables, 60 to 89 Days Past Due [Member]          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,009,000   1,009,000   1,836,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction and land development          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 299,000   299,000   131,000
Financing Receivables, 60 to 89 Days Past Due [Member] | 1-4 Family residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 57,000   57,000   713,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Multifamily residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 98,000   98,000   0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 304,000   304,000   716,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 199,000   199,000   84,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and industrial loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 49,000   49,000   155,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 3,000   3,000   37,000
Financing Receivables, 60 to 89 Days Past Due [Member] | All other loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans secured by real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 758,000   758,000   1,560,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 2,799,000   2,799,000   1,881,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction and land development          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 104,000   104,000   293,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | 1-4 Family residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,235,000   1,235,000   1,008,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Multifamily residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   240,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,196,000   1,196,000   43,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   37,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 176,000   176,000   249,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 88,000   88,000   11,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | All other loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans secured by real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due $ 2,535,000   $ 2,535,000   $ 1,584,000