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Loans and Allowance for Loan Losses (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) alternative | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) | $ 1,840,000 | $ 733,000 | $ 3,562,000 | $ 846,000 | $ 2,826,000 |  |  |
Gross loans |  |  |  |  |  | $ 1,833,349,000 | $ 1,836,251,000 |
Loans Receivable Held-for-sale, Amount |  |  |  |  |  | 1,932,000 | 1,175,000 |
loans and leases receivable gross excluding loans held for sale |  |  |  |  |  | 1,831,417,000 | 1,835,076,000 |
Less [Abstract] |  |  |  |  |  |  |  |
Net deferred loan fees, premiums and discounts |  |  |  |  |  | 7,715,000 | 10,259,000 |
Allowance for loan losses | 17,846,000 | 14,736,000 | 16,753,000 | 14,576,000 | 14,576,000 | 18,209,000 | 16,753,000 | $ 15,164,000
Net loans |  |  |  |  |  | 1,805,493,000 | 1,808,064,000 |
Increase (Decrease) in loans receivable |  |  | (2,600,000) |  |  |  |  |
Impaired Loans [Abstract] |  |  |  |  |  |  |  |
Minimum value of loans individually measured for impairment |  |  | $ 250,000 |  |  |  |  |
Number of alternatives for measuring impaired loans receivable | alternative |  |  | 3 |  |  |  |  |
Allowance for Loan Losses [Abstract] |  |  |  |  |  |  |  |
Balance, beginning of period | 17,846,000 | 14,736,000 | $ 16,753,000 | 14,576,000 | 14,576,000 |  |  |
Provision for Loan and Lease Losses | 1,840,000 | 733,000 | 3,562,000 | 846,000 |  |  |  |
Losses charged off | (1,718,000) | (739,000) | (2,481,000) | (976,000) | (1,675,000) |  |  |
Recoveries | 241,000 | 434,000 | 375,000 | 718,000 | 1,026,000 |  |  |
Balance, end of period | 18,209,000 | 15,164,000 | $ 18,209,000 | 15,164,000 | 16,753,000 |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 242,000 | 858,000 | 297,000
Collectively evaluated for impairment |  |  |  |  |  | 17,967,000 | 15,881,000 | 14,867,000
Financing Receivable, Allowance for Credit Losses |  |  |  |  |  |  |  | 0
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 7,656,000 | 5,266,000 | 2,006,000
Collectively evaluated for impairment |  |  |  |  |  | 1,811,868,000 | 1,812,640,000 | 1,313,181,000
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  |  |  | 1,825,634,000 | 1,825,992,000 | 1,315,187,000
Construction and land development |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  |  |  |  | 68,847,000 | 49,366,000 |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  |  |  | 68,681,000 | 49,104,000 |
Agricultural real estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  |  |  |  | 123,508,000 | 126,216,000 |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  |  |  | 123,420,000 | 126,108,000 |
1-4 Family residential properties |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  |  |  |  | 311,699,000 | 328,119,000 |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Period When Loans are Charged-down |  |  | 180 days |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  |  |  | 310,522,000 | 326,415,000 |
Multifamily residential properties |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  |  |  |  | 72,660,000 | 83,478,000 |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  |  |  | 72,492,000 | 83,200,000 |
Commercial real estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  |  |  |  | 635,420,000 | 633,694,000 |
Loans Receivable Additional Information [Abstract] |  |  |  |  |  |  |  |
Debt coverage ratio |  |  | 1.20x |  |  |  |  |
Amortization period of loans |  |  | twenty years |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  |  |  | 632,492,000 | 630,135,000 |
Commercial real estate | Minimum [Member] |  |  |  |  |  |  |  |
Loans Receivable Additional Information [Abstract] |  |  |  |  |  |  |  |
Maximum Loan-to-value Ratio (in hundredths) |  |  | 65.00% |  |  |  |  |
Commercial real estate | Maximum [Member] |  |  |  |  |  |  |  |
Loans Receivable Additional Information [Abstract] |  |  |  |  |  |  |  |
Maximum Loan-to-value Ratio (in hundredths) |  |  | 80.00% |  |  |  |  |
Loans secured by real estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  |  |  |  | 1,212,134,000 | 1,220,873,000 |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  |  |  | 1,207,607,000 | 1,214,962,000 |
Agricultural loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  |  |  |  | 79,763,000 | 86,735,000 |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  |  |  | 79,759,000 | 86,685,000 |
Commercial and industrial loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  |  |  |  | 422,982,000 | 412,637,000 |
Loans Receivable Additional Information [Abstract] |  |  |  |  |  |  |  |
Maximum Loan-to-value Ratio (in hundredths) |  |  | 80.00% |  |  |  |  |
Amortization period of loans |  |  | seven years |  |  |  |  |
Loans Receivable, Time Period |  |  | one year |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  |  |  | 421,280,000 | 409,033,000 |
Consumer loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) | 57,000 | 88,000 | $ 107,000 | 211,000 | 501,000 |  |  |
Gross loans |  |  |  |  |  | 33,132,000 | 38,404,000 |
Less [Abstract] |  |  |  |  |  |  |  |
Allowance for loan losses | 751,000 | 710,000 | 693,000 | 642,000 | 642,000 | 716,000 | 693,000 | 733,000
Allowance for Loan Losses [Abstract] |  |  |  |  |  |  |  |
Balance, beginning of period | 751,000 | 710,000 | 693,000 | 642,000 | 642,000 |  |  |
Losses charged off | (135,000) | (109,000) | (237,000) | (222,000) | (664,000) |  |  |
Recoveries | 43,000 | 44,000 | 153,000 | 102,000 | 214,000 |  |  |
Balance, end of period | 716,000 | 733,000 | 716,000 | 733,000 | 693,000 |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 1,000 | 0 | 0
Collectively evaluated for impairment |  |  |  |  |  | 715,000 | 693,000 | 733,000
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 248,000 | 213,000 | 21,000
Collectively evaluated for impairment |  |  |  |  |  | 35,611,000 | 41,644,000 | 41,656,000
Loans Receivable, Net |  |  |  |  |  | 35,859,000 | 41,857,000 | 41,677,000
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  |  |  | 32,814,000 | 38,028,000 |
All other loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  |  |  |  | 85,338,000 | 77,602,000 |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  |  |  | 84,174,000 | 77,284,000 |
Agricultural and Farm Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  |  |  |  | 203,300,000 | 213,000,000 |
Less [Abstract] |  |  |  |  |  |  |  |
Increase (Decrease) in loans receivable |  |  | $ (9,700,000) |  |  |  |  |
Loans Receivable Additional Information [Abstract] |  |  |  |  |  |  |  |
Maximum Loan-to-value Ratio (in hundredths) |  |  | 65.00% |  |  |  |  |
Amortization period of loans |  |  | twenty five years |  |  |  |  |
Loans Receivable, Time Period |  |  | one year |  |  |  |  |
Other Grain Farming [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  |  |  |  | 164,700,000 | 171,300,000 |
Less [Abstract] |  |  |  |  |  |  |  |
Increase (Decrease) in loans receivable |  |  | $ (6,600,000) |  |  |  |  |
Motels and Hotels Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  |  |  |  | 120,500,000 |  |
Non-residential Buildings [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  |  |  |  | 145,800,000 |  |
Residential Buildings [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  |  |  |  | 129,700,000 |  |
Unsecured Open-end Loans [Member] |  |  |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Period When Loans are Charged-down |  |  | 180 days |  |  |  |  |
Other Secured Loans [Member] |  |  |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Period When Loans are Charged-down |  |  | 120 days |  |  |  |  |
Commercial/ Commercial Real Estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) | 1,667,000 | 388,000 | $ 3,133,000 | 613,000 | 1,467,000 |  |  |
Less [Abstract] |  |  |  |  |  |  |  |
Allowance for loan losses | 13,771,000 | 11,789,000 | 12,901,000 | 11,379,000 | 11,379,000 | 14,747,000 | 12,901,000 | 11,995,000
Allowance for Loan Losses [Abstract] |  |  |  |  |  |  |  |
Balance, beginning of period | 13,771,000 | 11,789,000 | 12,901,000 | 11,379,000 | 11,379,000 |  |  |
Losses charged off | (871,000) | (572,000) | (1,483,000) | (612,000) | (747,000) |  |  |
Recoveries | 180,000 | 390,000 | 196,000 | 615,000 | 802,000 |  |  |
Balance, end of period | 14,747,000 | 11,995,000 | 14,747,000 | 11,995,000 | 12,901,000 |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 194,000 | 192,000 | 297,000
Collectively evaluated for impairment |  |  |  |  |  | 14,553,000 | 12,695,000 | 11,698,000
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 5,653,000 | 1,956,000 | 1,555,000
Collectively evaluated for impairment |  |  |  |  |  | 1,241,763,000 | 1,199,003,000 | 855,595,000
Loans Receivable, Net |  |  |  |  |  | 1,253,526,000 | 1,204,799,000 | 857,150,000
Agricultural/ Agricultural Real Estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) | 86,000 | 179,000 | 155,000 | 111,000 | 933,000 |  |  |
Less [Abstract] |  |  |  |  |  |  |  |
Allowance for loan losses | 2,319,000 | 1,270,000 | 2,249,000 | 1,337,000 | 1,337,000 | 1,743,000 | 2,249,000 | 1,449,000
Allowance for Loan Losses [Abstract] |  |  |  |  |  |  |  |
Balance, beginning of period | 2,319,000 | 1,270,000 | 2,249,000 | 1,337,000 | 1,337,000 |  |  |
Losses charged off | (662,000) | 0 | (662,000) | 0 | (30,000) |  |  |
Recoveries | 0 | 0 | 1,000 | 1,000 | 9,000 |  |  |
Balance, end of period | 1,743,000 | 1,449,000 | 1,743,000 | 1,449,000 | 2,249,000 |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 0 | 660,000 | 0
Collectively evaluated for impairment |  |  |  |  |  | 1,743,000 | 1,589,000 | 1,449,000
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 261,000 | 1,345,000 | 430,000
Collectively evaluated for impairment |  |  |  |  |  | 202,620,000 | 211,168,000 | 194,384,000
Loans Receivable, Net |  |  |  |  |  | 202,881,000 | 212,513,000 | 194,814,000
Residential Real Estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) | 23,000 | 56,000 | 169,000 | 72,000 | 113,000 |  |  |
Less [Abstract] |  |  |  |  |  |  |  |
Allowance for loan losses | 978,000 | 926,000 | $ 874,000 | 994,000 | 994,000 | 969,000 | 874,000 | 924,000
Loans Receivable Additional Information [Abstract] |  |  |  |  |  |  |  |
Maximum Loan-to-value Ratio (in hundredths) |  |  | 80.00% |  |  |  |  |
Amortization period of loans |  |  | twenty five years |  |  |  |  |
Balloon period |  |  | five years |  |  |  |  |
Allowance for Loan Losses [Abstract] |  |  |  |  |  |  |  |
Balance, beginning of period | 978,000 | 926,000 | $ 874,000 | 994,000 | 994,000 |  |  |
Losses charged off | (50,000) | (58,000) | (99,000) | (142,000) | (234,000) |  |  |
Recoveries | 18,000 | 0 | 25,000 | 0 | 1,000 |  |  |
Balance, end of period | 969,000 | 924,000 | 969,000 | 924,000 | 874,000 |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 47,000 | 6,000 | 0
Collectively evaluated for impairment |  |  |  |  |  | 922,000 | 868,000 | 924,000
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 1,494,000 | 1,752,000 | 0
Collectively evaluated for impairment |  |  |  |  |  | 331,874,000 | 360,825,000 | 221,546,000
Loans Receivable, Net |  |  |  |  |  | 333,368,000 | 366,823,000 | 221,546,000
Unallocated |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) | 7,000 | 22,000 | (2,000) | (161,000) | (188,000) |  |  |
Less [Abstract] |  |  |  |  |  |  |  |
Allowance for loan losses | 27,000 | 41,000 | 36,000 | 224,000 | 224,000 | 34,000 | 36,000 | 63,000
Allowance for Loan Losses [Abstract] |  |  |  |  |  |  |  |
Balance, beginning of period | 27,000 | 41,000 | 36,000 | 224,000 | 224,000 |  |  |
Losses charged off | 0 | 0 | 0 | 0 | 0 |  |  |
Recoveries | 0 | 0 | 0 | 0 | 0 |  |  |
Balance, end of period | $ 34,000 | $ 63,000 | $ 34,000 | $ 63,000 | $ 36,000 |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 0 | 0 | 0
Collectively evaluated for impairment |  |  |  |  |  | 34,000 | 36,000 | 63,000
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 0 | 0 | 0
Collectively evaluated for impairment |  |  |  |  |  | 0 | 0 | 0
Loans Receivable, Net |  |  |  |  |  | 0 | 0 | 0
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |
Less [Abstract] |  |  |  |  |  |  |  |
Net loans |  |  |  |  |  | 6,110,000 | 8,072,000 |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |  | 0 | 14,000 | 0
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Financing Receivable, Net |  |  |  |  |  | 6,110,000 | 8,086,000 | 0
Receivables Acquired with Deteriorated Credit Quality [Member] | 1-4 Family residential properties |  |  |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Financing Receivable, Net |  |  |  |  |  | 0 | 827,000 |
Receivables Acquired with Deteriorated Credit Quality [Member] | Multifamily residential properties |  |  |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Financing Receivable, Net |  |  |  |  |  | 3,396,000 | 3,419,000 |
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial and industrial loans |  |  |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Financing Receivable, Net |  |  |  |  |  | 16,000 | 24,000 |
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer loans |  |  |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |  | 0 | 0 | 0
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Financing Receivable, Net |  |  |  |  |  | 0 | 0 | 0
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial/ Commercial Real Estate |  |  |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |  | 0 | 14,000 | 0
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Financing Receivable, Net |  |  |  |  |  | 6,110,000 | 3,840,000 | 0
Receivables Acquired with Deteriorated Credit Quality [Member] | Agricultural/ Agricultural Real Estate |  |  |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |  | 0 | 0 | 0
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Financing Receivable, Net |  |  |  |  |  | 0 | 0 | 0
Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Real Estate |  |  |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |  | 0 | 0 | 0
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Financing Receivable, Net |  |  |  |  |  | 0 | 4,246,000 | 0
Receivables Acquired with Deteriorated Credit Quality [Member] | Unallocated |  |  |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |  | 0 | 0 | 0
Ending Balance [Abstract] |  |  |  |  |  |  |  |
Financing Receivable, Net |  |  |  |  |  | $ 0 | $ 0 | $ 0

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