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Loans and Allowance for Loan Losses, Part II (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net $ 2,695,347,000 $ 2,644,519,000  
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 27,593,000 28,037,000  
Current 2,667,754,000 2,616,482,000  
Total Loans Greater than 90 Days Past Due and Still Accruing $ 0 0  
Number of days past due when interest is not accrued ninety days    
Period of satisfactory performance before returning to accrual status six months    
Loans with a specific allowance [Abstract]      
Recorded Balance $ 23,440,000 32,603,000  
Unpaid Principal Balance 25,861,000 34,178,000  
Specific Allowance 1,098,000 3,279,000  
Loans without a specific allowance [Abstract]      
Recorded Balance 7,991,000 15,385,000  
Unpaid Principal Balance 10,425,000 17,126,000  
Total Loans [Abstract]      
Recorded Balance 31,431,000 47,988,000  
Unpaid Principal Balance 36,286,000 51,304,000  
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 41,700,000 38,618,000 $ 17,183,000
Interest income recognized 448,000 619,000 51,000
Balances of Nonaccrual Loans [Abstract]      
Recorded balance of nonaccrual loans 25,118,000 27,298,000  
Interest Lost on Nonaccrual Loans 906,000,000 1,189,000,000 471,000,000
Troubled Debt Restructuring [Abstract]      
Troubled Debt Restructurings Balance 5,803,000 9,956,000  
Troubled Debt Restructuring, Allowance 381,000 1,418,000  
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Troubled Debt Restructurings Balance 5,803,000 9,956,000  
Financing Receivable Modifications Performing Recorded Investment 2,701,000 2,451,000  
Financing Receivables, Modifications during Period, Balance $ 1,816,000 $ 1,262,000  
Financing Receivables, Modifications during Period, Number 13 23  
Subsequent Default, Number of Days Past Due ninety days    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 1    
Other real estate owned $ 3,644,000 $ 2,534,000  
Mortgage Loans Secured By Real Estate In Foreclosure 667,000 425,000  
Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 2,558,157,000 2,511,889,000  
Watch [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 71,611,000 58,716,000  
Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 65,579,000 73,914,000  
Doubtful [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 0 0  
Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 94,142,000 50,619,000  
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 235,000 503,000  
Current 93,907,000 50,116,000  
Total Loans Greater than 90 Days Past Due and Still Accruing 0 0  
Loans with a specific allowance [Abstract]      
Recorded Balance 256,000 2,559,000  
Unpaid Principal Balance 256,000 2,559,000  
Specific Allowance 0 14,000  
Loans without a specific allowance [Abstract]      
Recorded Balance 41,000 48,000  
Unpaid Principal Balance 41,000 48,000  
Total Loans [Abstract]      
Recorded Balance 297,000 2,607,000  
Unpaid Principal Balance 297,000 2,607,000  
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 622,000 2,558,000 0
Interest income recognized 32,000 37,000 0
Balances of Nonaccrual Loans [Abstract]      
Recorded balance of nonaccrual loans 41,000 377,000  
Troubled Debt Restructuring [Abstract]      
Troubled Debt Restructurings Balance 0 0  
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Troubled Debt Restructurings Balance 0 0  
Construction and land development | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 93,413,000 49,794,000  
Construction and land development | Watch [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 413,000 471,000  
Construction and land development | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 316,000 354,000  
Construction and land development | Doubtful [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 0 0  
Farm loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 240,241,000 231,700,000  
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 1,642,000 804,000  
Current 238,599,000 230,896,000  
Total Loans Greater than 90 Days Past Due and Still Accruing 0 0  
Loans with a specific allowance [Abstract]      
Recorded Balance 0 0  
Unpaid Principal Balance 0 0  
Specific Allowance 0 0  
Loans without a specific allowance [Abstract]      
Recorded Balance 479,000 309,000  
Unpaid Principal Balance 479,000 309,000  
Total Loans [Abstract]      
Recorded Balance 479,000 309,000  
Unpaid Principal Balance 479,000 309,000  
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 1,218,000 415,000 293,000
Interest income recognized 0 0 0
Balances of Nonaccrual Loans [Abstract]      
Recorded balance of nonaccrual loans 479,000 309,000  
Farm loans | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 231,227,000 221,047,000  
Farm loans | Watch [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 6,902,000 7,805,000  
Farm loans | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 2,112,000 2,848,000  
Farm loans | Doubtful [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 0 0  
1-4 Family residential properties      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 336,427,000 373,518,000  
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 10,835,000 10,478,000  
Current 325,592,000 363,040,000  
Total Loans Greater than 90 Days Past Due and Still Accruing 0 0  
Loans with a specific allowance [Abstract]      
Recorded Balance 5,154,000 4,565,000  
Unpaid Principal Balance 5,351,000 4,952,000  
Specific Allowance 182,000 234,000  
Loans without a specific allowance [Abstract]      
Recorded Balance 3,719,000 3,680,000  
Unpaid Principal Balance 4,263,000 4,769,000  
Total Loans [Abstract]      
Recorded Balance 8,873,000 8,245,000  
Unpaid Principal Balance 9,614,000 9,721,000  
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 9,659,000 6,297,000 3,267,000
Interest income recognized 80,000 144,000 29,000
Loans Receivable, Modifications, Still Accruing Interest 1,382,000 1,769,000  
Balances of Nonaccrual Loans [Abstract]      
Recorded balance of nonaccrual loans 7,379,000 5,762,000  
Troubled Debt Restructuring [Abstract]      
Troubled Debt Restructurings Balance 1,905,000 2,472,000  
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Troubled Debt Restructurings Balance 1,905,000 2,472,000  
Financing Receivable Modifications Performing Recorded Investment 1,382,000 1,769,000  
Financing Receivables, Modifications during Period, Balance $ 131,000 $ 688,000  
Financing Receivables, Modifications during Period, Number [1] 3 16  
1-4 Family residential properties | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net $ 314,999,000 $ 352,583,000  
1-4 Family residential properties | Watch [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 5,743,000 5,526,000  
1-4 Family residential properties | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 15,685,000 15,409,000  
1-4 Family residential properties | Doubtful [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 0 0  
Multifamily residential properties      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 153,948,000 184,051,000  
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 2,525,000 3,104,000  
Current 151,423,000 180,947,000  
Total Loans Greater than 90 Days Past Due and Still Accruing 0 0  
Loans with a specific allowance [Abstract]      
Recorded Balance 4,254,000 4,465,000  
Unpaid Principal Balance 4,254,000 4,465,000  
Specific Allowance 19,000 0  
Loans without a specific allowance [Abstract]      
Recorded Balance 0 7,597,000  
Unpaid Principal Balance 0 7,597,000  
Total Loans [Abstract]      
Recorded Balance 4,254,000 12,062,000  
Unpaid Principal Balance 4,254,000 12,062,000  
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 6,490,000 9,666,000 377,000
Interest income recognized 89,000 137,000 1,000
Balances of Nonaccrual Loans [Abstract]      
Recorded balance of nonaccrual loans 3,137,000 2,105,000  
Troubled Debt Restructuring [Abstract]      
Troubled Debt Restructurings Balance 0 0  
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Troubled Debt Restructurings Balance 0 0  
Financing Receivable Modifications Performing Recorded Investment 0 0  
Multifamily residential properties | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 136,958,000 163,845,000  
Multifamily residential properties | Watch [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 5,588,000 8,144,000  
Multifamily residential properties | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 11,402,000 12,062,000  
Multifamily residential properties | Doubtful [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 0 0  
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 995,702,000 906,850,000  
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 3,338,000 5,496,000  
Current 992,364,000 901,354,000  
Total Loans Greater than 90 Days Past Due and Still Accruing 0 0  
Loans with a specific allowance [Abstract]      
Recorded Balance 5,904,000 12,517,000  
Unpaid Principal Balance 6,408,000 12,804,000  
Specific Allowance 587,000 1,553,000  
Loans without a specific allowance [Abstract]      
Recorded Balance 1,721,000 983,000  
Unpaid Principal Balance 1,724,000 1,201,000  
Total Loans [Abstract]      
Recorded Balance 7,625,000 13,500,000  
Unpaid Principal Balance 8,132,000 14,005,000  
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 12,189,000 9,818,000 5,457,000
Interest income recognized 234,000 271,000 13,000
Loans Receivable, Modifications, Still Accruing Interest 1,146,000 676,000  
Balances of Nonaccrual Loans [Abstract]      
Recorded balance of nonaccrual loans 4,351,000 8,457,000  
Troubled Debt Restructuring [Abstract]      
Troubled Debt Restructurings Balance 1,746,000 1,706,000  
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Troubled Debt Restructurings Balance 1,746,000 1,706,000  
Financing Receivable Modifications Performing Recorded Investment 1,146,000 676,000  
Financing Receivables, Modifications during Period, Balance $ 1,507,000 $ 479,000  
Financing Receivables, Modifications during Period, Number [1] 3 2  
Commercial real estate | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net $ 966,585,000 $ 861,086,000  
Commercial real estate | Watch [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 8,568,000 16,035,000  
Commercial real estate | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 20,549,000 29,729,000  
Commercial real estate | Doubtful [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 0 0  
Loans secured by real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 1,820,460,000 1,746,738,000  
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 18,575,000 20,385,000  
Current 1,801,885,000 1,726,353,000  
Total Loans Greater than 90 Days Past Due and Still Accruing 0 0  
Loans with a specific allowance [Abstract]      
Recorded Balance 15,568,000 24,106,000  
Unpaid Principal Balance 16,269,000 24,780,000  
Specific Allowance 788,000 1,801,000  
Loans without a specific allowance [Abstract]      
Recorded Balance 5,960,000 12,617,000  
Unpaid Principal Balance 6,507,000 13,924,000  
Total Loans [Abstract]      
Recorded Balance 21,528,000 36,723,000  
Unpaid Principal Balance 22,776,000 38,704,000  
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 30,178,000 28,754,000 9,394,000
Interest income recognized 435,000 589,000 43,000
Balances of Nonaccrual Loans [Abstract]      
Recorded balance of nonaccrual loans 15,387,000 17,010,000  
Troubled Debt Restructuring [Abstract]      
Troubled Debt Restructurings Balance 3,651,000 4,178,000  
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Troubled Debt Restructurings Balance 3,651,000 4,178,000  
Financing Receivable Modifications Performing Recorded Investment 2,528,000 2,445,000  
Financing Receivables, Modifications during Period, Balance $ 1,638,000 $ 1,167,000  
Financing Receivables, Modifications during Period, Number 6 18  
Agricultural loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net $ 136,124,000 $ 135,877,000  
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 607,000 83,000  
Current 135,517,000 135,794,000  
Total Loans Greater than 90 Days Past Due and Still Accruing 0 0  
Loans with a specific allowance [Abstract]      
Recorded Balance 85,000 36,000  
Unpaid Principal Balance 669,000 504,000  
Specific Allowance 8,000 0  
Loans without a specific allowance [Abstract]      
Recorded Balance 724,000 631,000  
Unpaid Principal Balance 140,000 163,000  
Total Loans [Abstract]      
Recorded Balance 809,000 667,000  
Unpaid Principal Balance 809,000 667,000  
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 808,000 727,000 878,000
Interest income recognized 3,000 23,000 0
Loans Receivable, Modifications, Still Accruing Interest 40,000 0  
Balances of Nonaccrual Loans [Abstract]      
Recorded balance of nonaccrual loans 769,000 667,000  
Troubled Debt Restructuring [Abstract]      
Troubled Debt Restructurings Balance 669,000 499,000  
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Troubled Debt Restructurings Balance 669,000 499,000  
Financing Receivables, Modifications during Period, Balance $ 40,000 $ 0  
Financing Receivables, Modifications during Period, Number [1] 1 0  
Agricultural loans | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net $ 129,811,000 $ 127,863,000  
Agricultural loans | Watch [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 3,862,000 7,581,000  
Agricultural loans | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 2,451,000 433,000  
Agricultural loans | Doubtful [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 0 0  
Commercial and industrial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 528,973,000 557,011,000  
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 7,611,000 5,329,000  
Current 521,362,000 551,682,000  
Total Loans Greater than 90 Days Past Due and Still Accruing 0 0  
Loans with a specific allowance [Abstract]      
Recorded Balance 7,653,000 8,292,000  
Unpaid Principal Balance 8,789,000 8,723,000  
Specific Allowance 301,000 1,475,000  
Loans without a specific allowance [Abstract]      
Recorded Balance 916,000 1,660,000  
Unpaid Principal Balance 3,065,000 2,027,000  
Total Loans [Abstract]      
Recorded Balance 8,569,000 9,952,000  
Unpaid Principal Balance 11,854,000 10,750,000  
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 10,065,000 9,003,000 6,586,000
Interest income recognized 9,000 6,000 8,000
Loans Receivable, Modifications, Still Accruing Interest 128,000    
Balances of Nonaccrual Loans [Abstract]      
Recorded balance of nonaccrual loans 8,441,000 8,990,000  
Troubled Debt Restructuring [Abstract]      
Troubled Debt Restructurings Balance 1,349,000 5,112,000  
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Troubled Debt Restructurings Balance 1,349,000 5,112,000  
Financing Receivable Modifications Performing Recorded Investment 128,000 0  
Financing Receivables, Modifications during Period, Balance $ 127,000 $ 67,000  
Financing Receivables, Modifications during Period, Number [1] 5 2  
Commercial and industrial loans | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net $ 479,233,000 $ 535,186,000  
Commercial and industrial loans | Watch [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 37,602,000 9,967,000  
Commercial and industrial loans | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 12,138,000 11,858,000  
Commercial and industrial loans | Doubtful [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 0 0  
Consumer loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 83,183,000 91,516,000  
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 800,000 1,543,000  
Current 82,383,000 89,973,000  
Total Loans Greater than 90 Days Past Due and Still Accruing 0 0  
Loans with a specific allowance [Abstract]      
Recorded Balance 134,000 169,000  
Unpaid Principal Balance 134,000 171,000  
Specific Allowance 1,000 3,000  
Loans without a specific allowance [Abstract]      
Recorded Balance 391,000 471,000  
Unpaid Principal Balance 713,000 1,006,000  
Total Loans [Abstract]      
Recorded Balance 525,000 640,000  
Unpaid Principal Balance 847,000 1,177,000  
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 649,000 131,000 325,000
Interest income recognized 1,000 1,000 0
Loans Receivable, Modifications, Still Accruing Interest 5,000 6,000  
Balances of Nonaccrual Loans [Abstract]      
Recorded balance of nonaccrual loans 521,000 625,000  
Troubled Debt Restructuring [Abstract]      
Troubled Debt Restructurings Balance 134,000 167,000  
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Troubled Debt Restructurings Balance 134,000 167,000  
Financing Receivable Modifications Performing Recorded Investment 5,000 6,000  
Financing Receivables, Modifications during Period, Balance $ 11,000 $ 28,000  
Financing Receivables, Modifications during Period, Number [1] 1 3  
Consumer loans | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net $ 82,117,000 $ 90,133,000  
Consumer loans | Watch [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 140,000 177,000  
Consumer loans | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 926,000 1,206,000  
Consumer loans | Doubtful [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 0 0  
All other loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 126,607,000 113,377,000  
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0 697,000  
Current 126,607,000 112,680,000  
Total Loans Greater than 90 Days Past Due and Still Accruing 0 0  
Loans with a specific allowance [Abstract]      
Recorded Balance 0 0  
Unpaid Principal Balance 0 0  
Specific Allowance 0 0  
Loans without a specific allowance [Abstract]      
Recorded Balance 0 6,000  
Unpaid Principal Balance 0 6,000  
Total Loans [Abstract]      
Recorded Balance 0 6,000  
Unpaid Principal Balance 0 6,000  
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 0 3,000 0
Interest income recognized 0 0 $ 0
Balances of Nonaccrual Loans [Abstract]      
Recorded balance of nonaccrual loans 0 6,000  
All other loans | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 123,814,000 110,352,000  
All other loans | Watch [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 2,793,000 3,010,000  
All other loans | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 0 15,000  
All other loans | Doubtful [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Net 0 0  
Financing Receivables, 30 to 59 Days Past Due [Member]      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 9,135,000 9,370,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction and land development      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 235,000 460,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Farm loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 1,595,000 0  
Financing Receivables, 30 to 59 Days Past Due [Member] | 1-4 Family residential properties      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 3,834,000 3,347,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Multifamily residential properties      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 1,348,000 1,149,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 602,000 1,349,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans secured by real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 7,614,000 6,305,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 300,000 63,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and industrial loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 767,000 1,417,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 454,000 888,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | All other loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0 697,000  
Financing Receivables, 60 to 89 Days Past Due [Member]      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 3,880,000 4,353,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction and land development      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0 43,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Farm loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0 804,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | 1-4 Family residential properties      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 2,288,000 3,051,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Multifamily residential properties      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 46,000 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 495,000 89,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans secured by real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 2,829,000 3,987,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and industrial loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 855,000 10,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 196,000 356,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | All other loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 14,578,000 14,314,000  
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  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Farm loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 47,000 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | 1-4 Family residential properties      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 4,713,000 4,080,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Multifamily residential properties      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 1,131,000 1,955,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 2,241,000 4,058,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans secured by real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 8,132,000 10,093,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 307,000 20,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 5,989,000 3,902,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 150,000 299,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | All other loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due $ 0 $ 0  
[1] Type of modifications:(a) Reduction of stated interest rate of loan(b) Change in payment terms(c) Extension of maturity date(d) Permanent reduction of the recorded investment