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Loans and Allowance for Loan Losses, Part II (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Loans Receivable Aging Analysis [Abstract]          
Total Past Due $ 19,413,000   $ 19,413,000   $ 10,919,000
Current 2,357,270,000   2,357,270,000   1,928,582,000
Total Loans Receivable 2,376,683,000 $ 1,825,634,000 2,376,683,000 $ 1,825,634,000 1,939,501,000
Total Loans 90 Days & Accruing 0   $ 0   0
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 18,728,000   $ 18,728,000   13,345,000
Unpaid Principal Balance 20,455,000   20,455,000   14,747,000
Specific Allowance 542,000   542,000   623,000
Loans without a specific allowance [Abstract]          
Recorded Balance 6,002,000   6,002,000   4,168,000
Unpaid Principal Balance 5,599,000   5,599,000   4,470,000
Total Loans [Abstract]          
Recorded Balance 24,730,000   24,730,000   17,513,000
Unpaid Principal Balance 26,054,000   26,054,000   19,217,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 25,105,000 17,968,000 25,361,000 16,333,000  
Interest income recognized 25,000 190,000 36,000 277,000  
Loans Receivable, Modifications, Still Accruing Interest 56,000   56,000   37,000
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 21,650,000   21,650,000   16,659,000
Interest Lost on Nonaccrual Loans     758,000 $ 140,000  
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 10,611,000   10,611,000   8,898,000
Financing Receivable Modifications Performing Recorded Investment 3,079,000   $ 3,079,000   854,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     1    
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     1 1  
Financing Receivables, Modifications during Period, Balance     $ 161,000 $ 819,000  
Subsequent Default, Number of Days Past Due     90 days    
Real Estate Acquired Through Foreclosure 2,440,000   $ 2,440,000   2,754,000
Mortgage Loans Secured By Real Estate In Foreclosure     738,000   404,000
Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 2,290,303,000   2,290,303,000   1,860,539,000
Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 34,443,000   34,443,000   42,675,000
Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 51,756,000   51,756,000   36,287,000
Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 181,000   181,000   0
Construction and land development          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 44,000   44,000   74,000
Current 88,437,000   88,437,000   107,520,000
Total Loans Receivable 88,481,000   88,481,000   107,594,000
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 58,000   58,000   0
Unpaid Principal Balance 58,000   58,000   0
Total Loans [Abstract]          
Recorded Balance 58,000   58,000   0
Unpaid Principal Balance 58,000   58,000   0
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 44,000 594,000 44,000 347,000  
Interest income recognized 0 0 0 0  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 58,000   58,000   0
Construction and land development | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 87,955,000   87,955,000   107,140,000
Construction and land development | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 444,000   444,000   454,000
Construction and land development | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 82,000   82,000   0
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   396,000
Current 184,247,000   184,247,000   126,787,000
Total Loans Receivable 184,887,000   184,887,000   127,183,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 0   0   276,000
Unpaid Principal Balance 0   0   276,000
Specific Allowance 0   0   0
Loans without a specific allowance [Abstract]          
Recorded Balance 235,000   235,000   15,000
Unpaid Principal Balance 235,000   235,000   15,000
Total Loans [Abstract]          
Recorded Balance 235,000   235,000   291,000
Unpaid Principal Balance 235,000   235,000   291,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 235,000 16,000 235,000 17,000  
Interest income recognized 0 0 0 0  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 235,000   235,000   291,000
Agricultural real estate | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 175,635,000   175,635,000   120,767,000
Agricultural real estate | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 6,628,000   6,628,000   4,829,000
Agricultural real estate | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 2,624,000   2,624,000   1,587,000
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 4,255,000   4,255,000   5,328,000
Current 374,318,000   374,318,000   288,339,000
Total Loans Receivable 378,573,000   378,573,000   293,667,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 3,540,000   3,540,000   1,026,000
Unpaid Principal Balance 3,912,000   3,912,000   1,347,000
Specific Allowance 19,000   19,000   25,000
Loans without a specific allowance [Abstract]          
Recorded Balance 3,178,000   3,178,000   2,239,000
Unpaid Principal Balance 3,270,000   3,270,000   2,664,000
Total Loans [Abstract]          
Recorded Balance 6,718,000   6,718,000   3,265,000
Unpaid Principal Balance 7,182,000   7,182,000   4,011,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 6,719,000 2,929,000 6,777,000 3,121,000  
Interest income recognized 22,000 106,000 28,000 117,000  
Loans Receivable, Modifications, Still Accruing Interest 2,396,000 594,000 2,396,000 $ 594,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 4,323,000   4,323,000   2,687,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 2,883,000   2,883,000   874,000
Financing Receivable Modifications Performing Recorded Investment 2,396,000   $ 2,396,000   578,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     1 0  
Financing Receivables, Modifications during Period, Balance     $ 161,000 $ 0  
1-4 Family residential properties | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 360,561,000   360,561,000   282,441,000
1-4 Family residential properties | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 3,342,000   3,342,000   2,654,000
1-4 Family residential properties | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 14,670,000   14,670,000   8,572,000
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 281,000   281,000   0
Current 105,667,000   105,667,000   61,798,000
Total Loans Receivable 105,948,000   105,948,000   61,798,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 301,000   301,000   313,000
Unpaid Principal Balance 301,000   301,000   313,000
Specific Allowance 0   0   0
Loans without a specific allowance [Abstract]          
Recorded Balance 0   0   55,000
Unpaid Principal Balance 0   0   55,000
Total Loans [Abstract]          
Recorded Balance 301,000   301,000   368,000
Unpaid Principal Balance 301,000   301,000   368,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 301,000 4,129,000 302,000 4,133,000  
Interest income recognized 0 51,000 0 94,000  
Loans Receivable, Modifications, Still Accruing Interest   3,395,000   3,395,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 301,000   301,000   368,000
Multifamily residential properties | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 103,653,000   103,653,000   60,954,000
Multifamily residential properties | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 464,000   464,000   476,000
Multifamily residential properties | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 1,831,000   1,831,000   368,000
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 7,472,000   7,472,000   3,694,000
Current 795,890,000   795,890,000   678,063,000
Total Loans Receivable 803,362,000   803,362,000   681,757,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 8,160,000   8,160,000   5,544,000
Unpaid Principal Balance 8,160,000   8,160,000   5,565,000
Specific Allowance 429,000   429,000   531,000
Loans without a specific allowance [Abstract]          
Recorded Balance 432,000   432,000   303,000
Unpaid Principal Balance 493,000   493,000   368,000
Total Loans [Abstract]          
Recorded Balance 8,592,000   8,592,000   5,847,000
Unpaid Principal Balance 8,653,000   8,653,000   5,933,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 8,675,000 7,068,000 8,680,000 5,316,000  
Interest income recognized 3,000 31,000 6,000 62,000  
Loans Receivable, Modifications, Still Accruing Interest 683,000 2,087,000 683,000 2,087,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 7,909,000   7,909,000   5,596,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 1,897,000   1,897,000   1,376,000
Financing Receivable Modifications Performing Recorded Investment 683,000   683,000   251,000
Commercial real estate | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 766,400,000   766,400,000   647,208,000
Commercial real estate | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 14,079,000   14,079,000   16,941,000
Commercial real estate | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 22,702,000   22,702,000   17,608,000
Commercial real estate | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 181,000   181,000   0
Agricultural loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 486,000   486,000   190,000
Current 113,047,000   113,047,000   86,441,000
Total Loans Receivable 113,533,000   113,533,000   86,631,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 154,000   154,000   212,000
Unpaid Principal Balance 1,002,000   1,002,000   1,009,000
Specific Allowance 30,000   30,000   2,000
Loans without a specific allowance [Abstract]          
Recorded Balance 955,000   955,000   545,000
Unpaid Principal Balance 359,000   359,000   0
Total Loans [Abstract]          
Recorded Balance 1,109,000   1,109,000   757,000
Unpaid Principal Balance 1,361,000   1,361,000   1,009,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 1,109,000 826,000 1,061,000 930,000  
Interest income recognized 0 0 0 $ 0  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 1,109,000   1,109,000   757,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 745,000   $ 745,000   757,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     0 1  
Financing Receivables, Modifications during Period, Balance     $ 0 $ 819,000  
Agricultural loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 109,985,000   109,985,000   83,469,000
Agricultural loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 2,622,000   2,622,000   2,304,000
Agricultural loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 926,000   926,000   858,000
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 5,136,000   5,136,000   965,000
Current 497,075,000   497,075,000   443,298,000
Total Loans Receivable 502,211,000   502,211,000   444,263,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 6,414,000   6,414,000   5,774,000
Unpaid Principal Balance 6,921,000   6,921,000   6,037,000
Specific Allowance 64,000   64,000   64,000
Loans without a specific allowance [Abstract]          
Recorded Balance 953,000   953,000   909,000
Unpaid Principal Balance 968,000   968,000   1,249,000
Total Loans [Abstract]          
Recorded Balance 7,367,000   7,367,000   6,683,000
Unpaid Principal Balance 7,889,000   7,889,000   7,286,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 7,672,000 1,781,000 7,892,000 1,841,000  
Interest income recognized 0 2,000 2,000 4,000  
Loans Receivable, Modifications, Still Accruing Interest   33,000   33,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 7,365,000   7,365,000   6,658,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 4,933,000   4,933,000   5,690,000
Financing Receivable Modifications Performing Recorded Investment 0   0   25,000
Commercial and industrial loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 489,913,000   489,913,000   425,846,000
Commercial and industrial loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 4,112,000   4,112,000   11,492,000
Commercial and industrial loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 8,186,000   8,186,000   6,925,000
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 1,099,000   1,099,000   272,000
Current 57,991,000   57,991,000   29,477,000
Total Loans Receivable 59,090,000   59,090,000   29,749,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 159,000   159,000   200,000
Unpaid Principal Balance 159,000   159,000   200,000
Specific Allowance 0   0   1,000
Loans without a specific allowance [Abstract]          
Recorded Balance 170,000   170,000   102,000
Unpaid Principal Balance 195,000   195,000   119,000
Total Loans [Abstract]          
Recorded Balance 329,000   329,000   302,000
Unpaid Principal Balance 354,000   354,000   319,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 329,000 625,000 349,000 628,000  
Interest income recognized 0 0 0 0  
Loans Receivable, Modifications, Still Accruing Interest   2,000   2,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 329,000   329,000   302,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 153,000   153,000   201,000
Consumer loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 58,377,000   58,377,000   29,375,000
Consumer loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 9,000   9,000   5,000
Consumer loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 704,000   704,000   369,000
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 140,598,000   140,598,000   106,859,000
Total Loans Receivable 140,598,000   140,598,000   106,859,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Specific Allowance 0   0   0
Loans without a specific allowance [Abstract]          
Recorded Balance 21,000   21,000   0
Unpaid Principal Balance 21,000   21,000   0
Total Loans [Abstract]          
Recorded Balance 21,000   21,000   0
Unpaid Principal Balance 21,000   21,000   0
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 21,000 0 21,000 0  
Interest income recognized 0 0 0 0  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 21,000   21,000   0
All other loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 137,824,000   137,824,000   103,339,000
All other loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 2,743,000   2,743,000   3,520,000
All other loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 31,000   31,000   0
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 12,692,000   12,692,000   9,492,000
Current 1,548,559,000   1,548,559,000   1,262,507,000
Total Loans Receivable 1,561,251,000   1,561,251,000   1,271,999,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 12,001,000   12,001,000   7,159,000
Unpaid Principal Balance 12,373,000   12,373,000   7,501,000
Specific Allowance 448,000   448,000   556,000
Loans without a specific allowance [Abstract]          
Recorded Balance 3,903,000   3,903,000   2,612,000
Unpaid Principal Balance 4,056,000   4,056,000   3,102,000
Total Loans [Abstract]          
Recorded Balance 15,904,000   15,904,000   9,771,000
Unpaid Principal Balance 16,429,000   16,429,000   10,603,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 15,974,000 14,736,000 16,038,000 12,934,000  
Interest income recognized 25,000 $ 188,000 34,000 $ 273,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 12,826,000   12,826,000   8,942,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 4,780,000   4,780,000   2,250,000
Financing Receivable Modifications Performing Recorded Investment 3,079,000   3,079,000   829,000
Financing Receivables, 30 to 59 Days Past Due [Member]          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 9,802,000   9,802,000   3,509,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction and land development          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   26,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 640,000   640,000   0
Financing Receivables, 30 to 59 Days Past Due [Member] | 1-4 Family residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 2,396,000   2,396,000   3,023,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Multifamily residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 281,000   281,000   0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 3,445,000   3,445,000   90,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 365,000   365,000   0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and industrial loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,891,000   1,891,000   192,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 784,000   784,000   178,000
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 6,762,000   6,762,000   3,139,000
Financing Receivables, 60 to 89 Days Past Due [Member]          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 3,936,000   3,936,000   726,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction and land development          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   48,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Financing Receivables, 60 to 89 Days Past Due [Member] | 1-4 Family residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 977,000   977,000   538,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Multifamily residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,495,000   1,495,000   38,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 11,000   11,000   32,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and industrial loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,140,000   1,140,000   3,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 313,000   313,000   67,000
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 2,472,000   2,472,000   624,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 5,675,000   5,675,000   6,684,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction and land development          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 44,000   44,000   0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   396,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | 1-4 Family residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 882,000   882,000   1,767,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Multifamily residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 2,532,000   2,532,000   3,566,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 110,000   110,000   158,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 2,105,000   2,105,000   770,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 2,000   2,000   27,000
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 $ 3,458,000   $ 3,458,000   $ 5,729,000