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

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