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Loans and Allowance for Loan Losses, Part II (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Loans Receivable Aging Analysis [Abstract]          
Total Past Due $ 28,095,000   $ 28,095,000   $ 10,919,000
Current 2,372,065,000   2,372,065,000   1,928,582,000
Total Loans Receivable 2,400,160,000 $ 1,867,562,000 2,400,160,000 $ 1,867,562,000 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 32,238,000   $ 32,238,000   13,345,000
Unpaid Principal Balance 33,891,000   33,891,000   14,747,000
Specific Allowance 1,519,000   1,519,000   623,000
Loans without a specific allowance [Abstract]          
Recorded Balance 6,878,000   6,878,000   4,168,000
Unpaid Principal Balance 8,055,000   8,055,000   4,470,000
Total Loans [Abstract]          
Recorded Balance 39,116,000   39,116,000   17,513,000
Unpaid Principal Balance 41,946,000   41,946,000   19,217,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 33,588,000 20,589,000 24,781,000 22,294,000  
Interest income recognized 478,000 93,000 649,000 265,000  
Loans Receivable, Modifications, Still Accruing Interest 56,000   56,000   37,000
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 25,334,000   25,334,000   16,659,000
Interest Lost on Nonaccrual Loans     1,096,000 $ 366,000  
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 10,341,000   10,341,000   8,898,000
Financing Receivable Modifications Performing Recorded Investment 2,591,000   $ 2,591,000   854,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     1    
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     19 6  
Financing Receivables, Modifications during Period, Balance     $ 1,144,000 $ 872,000  
Subsequent Default, Number of Days Past Due     90 days    
Real Estate Acquired Through Foreclosure 2,093,000   $ 2,093,000   2,754,000
Mortgage Loans Secured By Real Estate In Foreclosure     652,000   404,000
Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 2,285,846,000   2,285,846,000   1,860,539,000
Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 55,532,000   55,532,000   42,675,000
Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 58,782,000   58,782,000   36,287,000
Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Construction and land development          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 834,000   834,000   74,000
Current 90,521,000   90,521,000   107,520,000
Total Loans Receivable 91,355,000   91,355,000   107,594,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 292,000   292,000   0
Unpaid Principal Balance 292,000   292,000   0
Specific Allowance 21,000   21,000   0
Loans without a specific allowance [Abstract]          
Recorded Balance 67,000   67,000   0
Unpaid Principal Balance 67,000   67,000   0
Total Loans [Abstract]          
Recorded Balance 359,000   359,000   0
Unpaid Principal Balance 359,000   359,000   0
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 395,000 267,000 167,000 98,000  
Interest income recognized 22,000 0 29,000 0  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 67,000   67,000   0
Construction and land development | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 90,552,000   90,552,000   107,140,000
Construction and land development | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 439,000   439,000   454,000
Construction and land development | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 364,000   364,000   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 1,108,000   1,108,000   396,000
Current 190,616,000   190,616,000   126,787,000
Total Loans Receivable 191,724,000   191,724,000   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 171,000   171,000   15,000
Unpaid Principal Balance 171,000   171,000   15,000
Total Loans [Abstract]          
Recorded Balance 171,000   171,000   291,000
Unpaid Principal Balance 171,000   171,000   291,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 620,000 291,000 182,000 293,000  
Interest income recognized 0 0 0 0  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 171,000   171,000   291,000
Agricultural real estate | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 180,273,000   180,273,000   120,767,000
Agricultural real estate | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 9,500,000   9,500,000   4,829,000
Agricultural real estate | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 1,951,000   1,951,000   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 10,092,000   10,092,000   5,328,000
Current 357,251,000   357,251,000   288,339,000
Total Loans Receivable 367,343,000   367,343,000   293,667,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 5,670,000   5,670,000   1,026,000
Unpaid Principal Balance 6,057,000   6,057,000   1,347,000
Specific Allowance 249,000   249,000   25,000
Loans without a specific allowance [Abstract]          
Recorded Balance 3,343,000   3,343,000   2,239,000
Unpaid Principal Balance 4,465,000   4,465,000   2,664,000
Total Loans [Abstract]          
Recorded Balance 9,013,000   9,013,000   3,265,000
Unpaid Principal Balance 10,522,000   10,522,000   4,011,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 7,574,000 3,047,000 5,672,000 3,003,000  
Interest income recognized 137,000 5,000 188,000 16,000  
Loans Receivable, Modifications, Still Accruing Interest 1,908,000 410,000 1,908,000 $ 410,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 4,682,000   4,682,000   2,687,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 2,494,000   2,494,000   874,000
Financing Receivable Modifications Performing Recorded Investment 1,908,000   $ 1,908,000   578,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     15 1  
Financing Receivables, Modifications during Period, Balance     $ 604,000 $ 17,000  
1-4 Family residential properties | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 345,527,000   345,527,000   282,441,000
1-4 Family residential properties | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 7,142,000   7,142,000   2,654,000
1-4 Family residential properties | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 14,674,000   14,674,000   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 534,000   534,000   0
Current 99,834,000   99,834,000   61,798,000
Total Loans Receivable 100,368,000   100,368,000   61,798,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 4,488,000   4,488,000   313,000
Unpaid Principal Balance 4,488,000   4,488,000   313,000
Specific Allowance 0   0   0
Loans without a specific allowance [Abstract]          
Recorded Balance 229,000   229,000   55,000
Unpaid Principal Balance 229,000   229,000   55,000
Total Loans [Abstract]          
Recorded Balance 4,717,000   4,717,000   368,000
Unpaid Principal Balance 4,717,000   4,717,000   368,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 3,164,000 8,017,000 1,414,000 10,839,000  
Interest income recognized 126,000 80,000 169,000 229,000  
Loans Receivable, Modifications, Still Accruing Interest   5,217,000   5,217,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 805,000   805,000   368,000
Multifamily residential properties | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 90,751,000   90,751,000   60,954,000
Multifamily residential properties | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 4,900,000   4,900,000   476,000
Multifamily residential properties | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 4,717,000   4,717,000   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 7,830,000   7,830,000   3,694,000
Current 806,744,000   806,744,000   678,063,000
Total Loans Receivable 814,574,000   814,574,000   681,757,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 13,032,000   13,032,000   5,544,000
Unpaid Principal Balance 13,053,000   13,053,000   5,565,000
Specific Allowance 783,000   783,000   531,000
Loans without a specific allowance [Abstract]          
Recorded Balance 975,000   975,000   303,000
Unpaid Principal Balance 1,046,000   1,046,000   368,000
Total Loans [Abstract]          
Recorded Balance 14,007,000   14,007,000   5,847,000
Unpaid Principal Balance 14,099,000   14,099,000   5,933,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 11,932,000 5,762,000 8,595,000 4,638,000  
Interest income recognized 188,000 6,000 256,000 14,000  
Loans Receivable, Modifications, Still Accruing Interest 679,000 347,000 679,000 $ 347,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 8,769,000   8,769,000   5,596,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 1,883,000   1,883,000   1,376,000
Financing Receivable Modifications Performing Recorded Investment 679,000   $ 679,000   251,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     1 0  
Financing Receivables, Modifications during Period, Balance     $ 437,000 $ 0  
Commercial real estate | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 772,696,000   772,696,000   647,208,000
Commercial real estate | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 16,716,000   16,716,000   16,941,000
Commercial real estate | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 25,162,000   25,162,000   17,608,000
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 692,000   692,000   190,000
Current 120,078,000   120,078,000   86,441,000
Total Loans Receivable 120,770,000   120,770,000   86,631,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 46,000   46,000   212,000
Unpaid Principal Balance 609,000   609,000   1,009,000
Specific Allowance 0   0   2,000
Loans without a specific allowance [Abstract]          
Recorded Balance 717,000   717,000   545,000
Unpaid Principal Balance 154,000   154,000   0
Total Loans [Abstract]          
Recorded Balance 763,000   763,000   757,000
Unpaid Principal Balance 763,000   763,000   1,009,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 752,000 834,000 642,000 900,000  
Interest income recognized 0 0 0 $ 0  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 763,000   763,000   757,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 606,000   $ 606,000   757,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     0 4  
Financing Receivables, Modifications during Period, Balance     $ 0 $ 828,000  
Agricultural loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 111,903,000   111,903,000   83,469,000
Agricultural loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 8,048,000   8,048,000   2,304,000
Agricultural loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 819,000   819,000   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 5,265,000   5,265,000   965,000
Current 535,122,000   535,122,000   443,298,000
Total Loans Receivable 540,387,000   540,387,000   444,263,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 8,546,000   8,546,000   5,774,000
Unpaid Principal Balance 9,228,000   9,228,000   6,037,000
Specific Allowance 465,000   465,000   64,000
Loans without a specific allowance [Abstract]          
Recorded Balance 923,000   923,000   909,000
Unpaid Principal Balance 958,000   958,000   1,249,000
Total Loans [Abstract]          
Recorded Balance 9,469,000   9,469,000   6,683,000
Unpaid Principal Balance 10,186,000   10,186,000   7,286,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 8,909,000 2,075,000 8,109,000 2,216,000  
Interest income recognized 5,000 2,000 7,000 6,000  
Loans Receivable, Modifications, Still Accruing Interest   29,000   $ 29,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 9,473,000   9,473,000   6,658,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 5,208,000   5,208,000   5,690,000
Financing Receivable Modifications Performing Recorded Investment 0   $ 0   25,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     2 1  
Financing Receivables, Modifications during Period, Balance     $ 99,000 $ 27,000  
Commercial and industrial loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 524,649,000   524,649,000   425,846,000
Commercial and industrial loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 5,841,000   5,841,000   11,492,000
Commercial and industrial loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 9,897,000   9,897,000   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 1,740,000   1,740,000   272,000
Current 55,508,000   55,508,000   29,477,000
Total Loans Receivable 57,248,000   57,248,000   29,749,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 164,000   164,000   200,000
Unpaid Principal Balance 164,000   164,000   200,000
Specific Allowance 1,000   1,000   1,000
Loans without a specific allowance [Abstract]          
Recorded Balance 447,000   447,000   102,000
Unpaid Principal Balance 959,000   959,000   119,000
Total Loans [Abstract]          
Recorded Balance 611,000   611,000   302,000
Unpaid Principal Balance 1,123,000   1,123,000   319,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 234,000 296,000 0 307,000  
Interest income recognized 0 0 0 0  
Loans Receivable, Modifications, Still Accruing Interest   1,000   $ 1,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 598,000   598,000   302,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 150,000   150,000   201,000
Financing Receivable Modifications Performing Recorded Investment 4,000   $ 4,000   0
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     1 0  
Financing Receivables, Modifications during Period, Balance     $ 4,000 $ 0  
Consumer loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 55,865,000   55,865,000   29,375,000
Consumer loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 200,000   200,000   5,000
Consumer loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 1,183,000   1,183,000   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 116,391,000   116,391,000   106,859,000
Total Loans Receivable 116,391,000   116,391,000   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 6,000   6,000   0
Unpaid Principal Balance 6,000   6,000   0
Total Loans [Abstract]          
Recorded Balance 6,000   6,000   0
Unpaid Principal Balance 6,000   6,000   0
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 8,000 0 0 0  
Interest income recognized 0 0 0 0  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 6,000   6,000   0
All other loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 113,630,000   113,630,000   103,339,000
All other loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 2,746,000   2,746,000   3,520,000
All other loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 15,000   15,000   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 20,398,000   20,398,000   9,492,000
Current 1,544,966,000   1,544,966,000   1,262,507,000
Total Loans Receivable 1,565,364,000   1,565,364,000   1,271,999,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 23,482,000   23,482,000   7,159,000
Unpaid Principal Balance 23,890,000   23,890,000   7,501,000
Specific Allowance 1,053,000   1,053,000   556,000
Loans without a specific allowance [Abstract]          
Recorded Balance 4,785,000   4,785,000   2,612,000
Unpaid Principal Balance 5,978,000   5,978,000   3,102,000
Total Loans [Abstract]          
Recorded Balance 28,267,000   28,267,000   9,771,000
Unpaid Principal Balance 29,868,000   29,868,000   10,603,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 23,685,000 17,384,000 16,030,000 18,871,000  
Interest income recognized 473,000 $ 91,000 642,000 $ 259,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 14,494,000   14,494,000   8,942,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 4,377,000   4,377,000   2,250,000
Financing Receivable Modifications Performing Recorded Investment 2,587,000   $ 2,587,000   829,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     16 1  
Financing Receivables, Modifications during Period, Balance     $ 1,041,000 $ 17,000  
Financing Receivables, 30 to 59 Days Past Due [Member]          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 12,095,000   12,095,000   3,509,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction and land development          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 773,000   773,000   26,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 42,000   42,000   0
Financing Receivables, 30 to 59 Days Past Due [Member] | 1-4 Family residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 5,777,000   5,777,000   3,023,000
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 3,535,000   3,535,000   90,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 170,000   170,000   0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and industrial loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 809,000   809,000   192,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 989,000   989,000   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 10,127,000   10,127,000   3,139,000
Financing Receivables, 60 to 89 Days Past Due [Member]          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 4,817,000   4,817,000   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 2,313,000   2,313,000   538,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Multifamily residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 305,000   305,000   0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,285,000   1,285,000   38,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   32,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and industrial loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 467,000   467,000   3,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 447,000   447,000   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 3,903,000   3,903,000   624,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 11,183,000   11,183,000   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 61,000   61,000   0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,066,000   1,066,000   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 2,002,000   2,002,000   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 229,000   229,000   0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 3,010,000   3,010,000   3,566,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 522,000   522,000   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 3,989,000   3,989,000   770,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 304,000   304,000   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 $ 6,368,000   $ 6,368,000   $ 5,729,000