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Loans and Allowance for Loan Losses, Part II (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year $ 245,334,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 663,509,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 423,983,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 382,065,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 302,123,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 681,539,000    
Financing Receivable, Revolving 45,745,000    
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 39,197,000   $ 27,593,000
Current 2,705,101,000   2,667,754,000
Total Loans Receivable 2,744,298,000   2,695,347,000
Total Loans 90 Days & Accruing $ 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 $ 20,389,000   23,440,000
Unpaid Principal Balance 23,662,000   25,861,000
Specific Allowance 1,831,000   1,098,000
Loans without a specific allowance [Abstract]      
Recorded Balance 7,152,000   7,991,000
Unpaid Principal Balance 9,913,000   10,425,000
Total Loans [Abstract]      
Recorded Balance 27,541,000   31,431,000
Unpaid Principal Balance 33,575,000   36,286,000
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 31,294,000 $ 30,925,000  
Interest income recognized 71,000 30,000  
Balances of Nonaccrual Loans [Abstract]      
Financing Receivable, Nonaccrual, No Allowance 11,922,000    
Financing Receivable, Nonaccrual 21,787,000   25,118,000
Interest Lost on Nonaccrual Loans 1,029,000 1,097,000  
Troubled Debt Restructuring [Abstract]      
Financing Receivable Modifications Performing Recorded Investment $ 2,676,000 $ 2,100,000 2,701,000
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Financing Receivables, Modifications during Period, Number 3 5  
Financing Receivables, Modifications during Period, Balance $ 323,000 $ 615,000  
Subsequent Default, Number of Days Past Due 90 days    
Loans Receivable, Modifications, Allowance $ 528,000   381,000
Real Estate Acquired Through Foreclosure 2,784,000   3,644,000
Mortgage Loans Secured By Real Estate In Foreclosure 1,190,000   667,000
Troubled Debt Restructurings Balance 5,599,000   5,803,000
Construction and land development      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 47,279,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 58,076,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 6,708,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 3,471,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 997,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 6,795,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0   235,000
Current 123,326,000   93,907,000
Total Loans Receivable 123,326,000   94,142,000
Total Loans 90 Days & Accruing 0   0
Loans with a specific allowance [Abstract]      
Recorded Balance 540,000   256,000
Unpaid Principal Balance 540,000   256,000
Specific Allowance 269,000   0
Loans without a specific allowance [Abstract]      
Recorded Balance 39,000   41,000
Unpaid Principal Balance 39,000   41,000
Total Loans [Abstract]      
Recorded Balance 579,000   297,000
Unpaid Principal Balance 579,000   297,000
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 600,000 813,000  
Interest income recognized 8,000 0  
Balances of Nonaccrual Loans [Abstract]      
Financing Receivable, Nonaccrual, No Allowance 0    
Financing Receivable, Nonaccrual 39,000   41,000
Agricultural real estate      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 13,143,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 47,479,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 51,528,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 21,101,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 17,808,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 91,832,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 1,530,000   1,642,000
Current 241,361,000   238,599,000
Total Loans Receivable 242,891,000   240,241,000
Total Loans 90 Days & Accruing 0   0
Loans with a specific allowance [Abstract]      
Recorded Balance 150,000   0
Unpaid Principal Balance 150,000   0
Specific Allowance 0   0
Loans without a specific allowance [Abstract]      
Recorded Balance 419,000   479,000
Unpaid Principal Balance 419,000   479,000
Total Loans [Abstract]      
Recorded Balance 569,000   479,000
Unpaid Principal Balance 569,000   479,000
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 1,202,000 1,239,000  
Interest income recognized 0 0  
Balances of Nonaccrual Loans [Abstract]      
Financing Receivable, Nonaccrual, No Allowance 150,000    
Financing Receivable, Nonaccrual 569,000   479,000
1-4 Family residential properties      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 9,335,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 32,797,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 35,608,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 31,744,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 31,577,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 138,322,000    
Financing Receivable, Revolving 45,745,000    
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 9,291,000   10,835,000
Current 315,837,000   325,592,000
Total Loans Receivable 325,128,000   336,427,000
Total Loans 90 Days & Accruing 0   0
Loans with a specific allowance [Abstract]      
Recorded Balance 5,449,000   5,154,000
Unpaid Principal Balance 5,668,000   5,351,000
Specific Allowance 203,000   182,000
Loans without a specific allowance [Abstract]      
Recorded Balance 3,333,000   3,719,000
Unpaid Principal Balance 4,001,000   4,263,000
Total Loans [Abstract]      
Recorded Balance 8,782,000   8,873,000
Unpaid Principal Balance 9,669,000   9,614,000
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 8,997,000 8,690,000  
Interest income recognized 18,000 $ 23,000  
Balances of Nonaccrual Loans [Abstract]      
Financing Receivable, Nonaccrual, No Allowance 3,478,000    
Financing Receivable, Nonaccrual 7,416,000   7,379,000
Troubled Debt Restructuring [Abstract]      
Financing Receivable Modifications Performing Recorded Investment $ 1,366,000   1,382,000
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Financing Receivables, Modifications during Period, Number 0 1  
Financing Receivables, Modifications during Period, Balance $ 0 $ 46,000  
Troubled Debt Restructurings Balance 1,882,000   1,905,000
Multifamily residential properties      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 875,000   2,525,000
Current 138,859,000   151,423,000
Total Loans Receivable 139,734,000   153,948,000
Total Loans 90 Days & Accruing 0   0
Loans with a specific allowance [Abstract]      
Recorded Balance 3,133,000   4,254,000
Unpaid Principal Balance 3,133,000   4,254,000
Specific Allowance 17,000   19,000
Loans without a specific allowance [Abstract]      
Recorded Balance 44,000   0
Unpaid Principal Balance 44,000   0
Total Loans [Abstract]      
Recorded Balance 3,177,000   4,254,000
Unpaid Principal Balance 3,177,000   4,254,000
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 3,323,000 1,718,000  
Interest income recognized 1,000 0  
Balances of Nonaccrual Loans [Abstract]      
Financing Receivable, Nonaccrual, No Allowance 2,260,000    
Financing Receivable, Nonaccrual 3,104,000   3,137,000
Commercial real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 18,735,000   3,338,000
Current 984,133,000   992,364,000
Total Loans Receivable 1,002,868,000   995,702,000
Total Loans 90 Days & Accruing 0   0
Loans with a specific allowance [Abstract]      
Recorded Balance 6,494,000   5,904,000
Unpaid Principal Balance 6,998,000   6,408,000
Specific Allowance 1,029,000   587,000
Loans without a specific allowance [Abstract]      
Recorded Balance 1,463,000   1,721,000
Unpaid Principal Balance 1,540,000   1,724,000
Total Loans [Abstract]      
Recorded Balance 7,957,000   7,625,000
Unpaid Principal Balance 8,538,000   8,132,000
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 8,266,000 10,359,000  
Interest income recognized 42,000 $ 6,000  
Balances of Nonaccrual Loans [Abstract]      
Financing Receivable, Nonaccrual, No Allowance 1,273,000    
Financing Receivable, Nonaccrual 4,351,000   4,351,000
Troubled Debt Restructuring [Abstract]      
Financing Receivable Modifications Performing Recorded Investment $ 1,140,000   1,146,000
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Financing Receivables, Modifications during Period, Number 1 1  
Financing Receivables, Modifications during Period, Balance $ 305,000 $ 483,000  
Troubled Debt Restructurings Balance 2,008,000   1,746,000
Commercial Real Estate Including Multifamily      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 50,922,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 209,016,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 183,020,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 214,536,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 188,511,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 296,597,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 1,142,602,000   1,149,650,000
Loans secured by real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 30,431,000   18,575,000
Current 1,803,516,000   1,801,885,000
Total Loans Receivable 1,833,947,000   1,820,460,000
Total Loans 90 Days & Accruing 0   0
Loans with a specific allowance [Abstract]      
Recorded Balance 15,766,000   15,568,000
Unpaid Principal Balance 16,489,000   16,269,000
Specific Allowance 1,518,000   788,000
Loans without a specific allowance [Abstract]      
Recorded Balance 5,298,000   5,960,000
Unpaid Principal Balance 6,043,000   6,507,000
Total Loans [Abstract]      
Recorded Balance 21,064,000   21,528,000
Unpaid Principal Balance 22,532,000   22,776,000
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 22,388,000 22,819,000  
Interest income recognized 69,000 $ 29,000  
Balances of Nonaccrual Loans [Abstract]      
Financing Receivable, Nonaccrual, No Allowance 7,161,000    
Financing Receivable, Nonaccrual 15,479,000   15,387,000
Troubled Debt Restructuring [Abstract]      
Financing Receivable Modifications Performing Recorded Investment $ 2,506,000   2,528,000
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Financing Receivables, Modifications during Period, Number 1 2  
Financing Receivables, Modifications during Period, Balance $ 305,000 $ 529,000  
Troubled Debt Restructurings Balance 3,890,000   3,651,000
Agricultural loans      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 33,077,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 82,596,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 12,046,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 4,427,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 1,813,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 5,177,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 518,000   607,000
Current 138,618,000   135,517,000
Total Loans Receivable 139,136,000   136,124,000
Total Loans 90 Days & Accruing 0   0
Loans with a specific allowance [Abstract]      
Recorded Balance 279,000   85,000
Unpaid Principal Balance 852,000   669,000
Specific Allowance 0   8,000
Loans without a specific allowance [Abstract]      
Recorded Balance 583,000   724,000
Unpaid Principal Balance 10,000   140,000
Total Loans [Abstract]      
Recorded Balance 862,000   809,000
Unpaid Principal Balance 862,000   809,000
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 960,000 664,000  
Interest income recognized 0 0  
Loans Receivable, Modifications, Still Accruing Interest 41,000 40,000  
Balances of Nonaccrual Loans [Abstract]      
Financing Receivable, Nonaccrual, No Allowance 812,000    
Financing Receivable, Nonaccrual 822,000   769,000
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Troubled Debt Restructurings Balance 553,000   669,000
Commercial and industrial loans      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 83,340,000    
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 7,551,000   7,611,000
Current 558,238,000   521,362,000
Total Loans Receivable 565,789,000   528,973,000
Total Loans 90 Days & Accruing 0   0
Loans with a specific allowance [Abstract]      
Recorded Balance 4,205,000   7,653,000
Unpaid Principal Balance 6,182,000   8,789,000
Specific Allowance 312,000   301,000
Loans without a specific allowance [Abstract]      
Recorded Balance 914,000   916,000
Unpaid Principal Balance 3,076,000   3,065,000
Total Loans [Abstract]      
Recorded Balance 5,119,000   8,569,000
Unpaid Principal Balance 9,258,000   11,854,000
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 7,402,000 6,698,000  
Interest income recognized 2,000 $ 1,000  
Balances of Nonaccrual Loans [Abstract]      
Financing Receivable, Nonaccrual, No Allowance 3,824,000    
Financing Receivable, Nonaccrual 4,994,000   8,441,000
Troubled Debt Restructuring [Abstract]      
Financing Receivable Modifications Performing Recorded Investment $ 125,000   128,000
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Financing Receivables, Modifications during Period, Number 1 2  
Financing Receivables, Modifications during Period, Balance $ 7,000 $ 72,000  
Troubled Debt Restructurings Balance 1,017,000   1,349,000
Commercial Including Other      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 201,506,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 114,453,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 94,150,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 55,303,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 140,359,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 689,111,000   655,580,000
Consumer loans      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 8,238,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 32,039,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 20,620,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 12,636,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 6,114,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 2,457,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 697,000   800,000
Current 81,407,000   82,383,000
Total Loans Receivable 82,104,000   83,183,000
Total Loans 90 Days & Accruing 0   0
Loans with a specific allowance [Abstract]      
Recorded Balance 139,000   134,000
Unpaid Principal Balance 139,000   134,000
Specific Allowance 1,000   1,000
Loans without a specific allowance [Abstract]      
Recorded Balance 357,000   391,000
Unpaid Principal Balance 784,000   713,000
Total Loans [Abstract]      
Recorded Balance 496,000   525,000
Unpaid Principal Balance 923,000   847,000
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 544,000 744,000  
Interest income recognized 0 $ 0  
Balances of Nonaccrual Loans [Abstract]      
Financing Receivable, Nonaccrual, No Allowance 125,000    
Financing Receivable, Nonaccrual 492,000   521,000
Troubled Debt Restructuring [Abstract]      
Financing Receivable Modifications Performing Recorded Investment $ 4,000   5,000
Recorded Balance of Troubled Debt Restructurings [Abstract]      
Financing Receivables, Modifications during Period, Number 1 1  
Financing Receivables, Modifications during Period, Balance $ 11,000 $ 14,000  
Troubled Debt Restructurings Balance 139,000   134,000
All other loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0   0
Current 123,322,000   126,607,000
Total Loans Receivable 123,322,000   126,607,000
Total Loans 90 Days & Accruing 0   0
Average recorded investment and interest income recognized [Abstract]      
Average investment in impaired loans 0 0  
Interest income recognized 0 $ 0  
Financial Asset, 30 to 59 Days Past Due [Member]      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 24,411,000   9,135,000
Financial Asset, 30 to 59 Days Past Due [Member] | Construction and land development      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0   235,000
Financial Asset, 30 to 59 Days Past Due [Member] | Agricultural real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 841,000   1,595,000
Financial Asset, 30 to 59 Days Past Due [Member] | 1-4 Family residential properties      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 5,617,000   3,834,000
Financial Asset, 30 to 59 Days Past Due [Member] | Multifamily residential properties      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0   1,348,000
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 15,443,000   602,000
Financial Asset, 30 to 59 Days Past Due [Member] | Loans secured by real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 21,901,000   7,614,000
Financial Asset, 30 to 59 Days Past Due [Member] | Agricultural loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 407,000   300,000
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial and industrial loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 1,631,000   767,000
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 472,000   454,000
Financial Asset, 30 to 59 Days Past Due [Member] | All other loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0   0
Financial Asset, 60 to 89 Days Past Due [Member]      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 3,767,000   3,880,000
Financial Asset, 60 to 89 Days Past Due [Member] | Construction and land development      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0   0
Financial Asset, 60 to 89 Days Past Due [Member] | Agricultural real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 476,000   0
Financial Asset, 60 to 89 Days Past Due [Member] | 1-4 Family residential properties      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 1,526,000   2,288,000
Financial Asset, 60 to 89 Days Past Due [Member] | Multifamily residential properties      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 875,000   46,000
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 129,000   495,000
Financial Asset, 60 to 89 Days Past Due [Member] | Loans secured by real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 3,006,000   2,829,000
Financial Asset, 60 to 89 Days Past Due [Member] | Agricultural loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 100,000   0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial and industrial loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 562,000   855,000
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 99,000   196,000
Financial Asset, 60 to 89 Days Past Due [Member] | All other loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0   0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 11,019,000   14,578,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction and land development      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0   0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agricultural real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 213,000   47,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | 1-4 Family residential properties      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 2,148,000   4,713,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Multifamily residential properties      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0   1,131,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 3,163,000   2,241,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans secured by real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 5,524,000   8,132,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agricultural loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 11,000   307,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and industrial loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 5,358,000   5,989,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 126,000   150,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | All other loans      
Loans Receivable Aging Analysis [Abstract]      
Total Past Due 0   0
Pass [Member]      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 242,095,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 619,708,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 410,622,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 369,676,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 286,018,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 632,677,000    
Financing Receivable, Revolving 44,251,000    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 2,605,047,000   2,558,157,000
Pass [Member] | Construction and land development      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 47,279,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 57,767,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 4,912,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 2,931,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 604,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 6,722,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 120,215,000   93,413,000
Pass [Member] | Agricultural real estate      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 12,868,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 44,321,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 48,157,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 20,904,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 16,689,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 87,879,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 230,818,000   231,227,000
Pass [Member] | 1-4 Family residential properties      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 9,125,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 32,088,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 33,208,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 28,598,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 29,270,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 128,255,000    
Financing Receivable, Revolving 44,251,000    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 304,795,000   314,999,000
Pass [Member] | Commercial Real Estate Including Multifamily      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 49,604,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 208,865,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 178,757,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 208,454,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 179,026,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 271,285,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 1,095,991,000   1,103,543,000
Pass [Member] | Loans secured by real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable     1,743,182,000
Pass [Member] | Agricultural loans      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 32,007,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 79,071,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 11,469,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 3,914,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 1,732,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 4,780,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 132,973,000   129,811,000
Pass [Member] | Commercial and industrial loans      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 83,001,000    
Pass [Member] | Commercial Including Other      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 165,672,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 113,733,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 92,434,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 52,819,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 131,520,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 639,179,000   603,047,000
Pass [Member] | Consumer loans      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 8,211,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 31,924,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 20,386,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 12,441,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 5,878,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 2,236,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 81,076,000   82,117,000
Special Mention [Member]      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 1,365,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 40,559,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 8,161,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 3,101,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 8,839,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 14,777,000    
Financing Receivable, Revolving 256,000    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 77,058,000   71,611,000
Special Mention [Member] | Construction and land development      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 0    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 309,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 1,796,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 0    
Financing Receivable, Originated Four Years before Latest Fiscal Year 393,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 15,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 2,513,000   413,000
Special Mention [Member] | Agricultural real estate      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 275,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 3,008,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 2,512,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 0    
Financing Receivable, Originated Four Years before Latest Fiscal Year 1,088,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 3,444,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 10,327,000   6,902,000
Special Mention [Member] | 1-4 Family residential properties      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 154,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 335,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 325,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 1,055,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 254,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 1,929,000    
Financing Receivable, Revolving 256,000    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 4,308,000   5,743,000
Special Mention [Member] | Commercial Real Estate Including Multifamily      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 61,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 24,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 2,857,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 1,795,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 4,912,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 4,109,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 13,758,000   14,156,000
Special Mention [Member] | Loans secured by real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable     27,214,000
Special Mention [Member] | Agricultural loans      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 838,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 3,320,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 364,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 0    
Financing Receivable, Originated Four Years before Latest Fiscal Year 81,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 274,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 4,877,000   3,862,000
Special Mention [Member] | Commercial and industrial loans      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 10,000    
Special Mention [Member] | Commercial Including Other      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 33,495,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 257,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 241,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 2,054,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 4,984,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 41,041,000   40,395,000
Special Mention [Member] | Consumer loans      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 27,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 68,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 50,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 10,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 57,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 22,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 234,000   140,000
Substandard [Member]      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 1,874,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 3,242,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 5,200,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 9,288,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 7,266,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 34,085,000    
Financing Receivable, Revolving 1,238,000    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 62,193,000   65,579,000
Substandard [Member] | Construction and land development      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 0    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 0    
Financing Receivable, Originated Two Years before Latest Fiscal Year 0    
Financing Receivable, Originated Three Years before Latest Fiscal Year 540,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 0    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 58,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 598,000   316,000
Substandard [Member] | Agricultural real estate      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 0    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 150,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 859,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 197,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 31,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 509,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 1,746,000   2,112,000
Substandard [Member] | 1-4 Family residential properties      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 56,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 374,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 2,075,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 2,091,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 2,053,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 8,138,000    
Financing Receivable, Revolving 1,238,000    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 16,025,000   15,685,000
Substandard [Member] | Commercial Real Estate Including Multifamily      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 1,257,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 127,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 1,406,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 4,287,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 4,573,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 21,203,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 32,853,000   31,951,000
Substandard [Member] | Loans secured by real estate      
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable     50,064,000
Substandard [Member] | Agricultural loans      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 232,000    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 205,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 213,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 513,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 0    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 123,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 1,286,000   2,451,000
Substandard [Member] | Commercial and industrial loans      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 329,000    
Substandard [Member] | Commercial Including Other      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 2,339,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 463,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 1,475,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 430,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 3,855,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable 8,891,000   12,138,000
Substandard [Member] | Consumer loans      
Credit Quality Information [Abstract]      
Financing Receivable, Originated in Current Fiscal Year 0    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 47,000    
Financing Receivable, Originated Two Years before Latest Fiscal Year 184,000    
Financing Receivable, Originated Three Years before Latest Fiscal Year 185,000    
Financing Receivable, Originated Four Years before Latest Fiscal Year 179,000    
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 199,000    
Financing Receivable, Revolving 0    
Loans Receivable Aging Analysis [Abstract]      
Total Loans Receivable $ 794,000   $ 926,000