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Loans and Allowance for Loan Losses (Details) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) alternative | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) | $ 947,000 | $ 1,055,000 | $ 8,667,000 |  |  |
Gross loans |  |  |  | $ 2,607,624,000 | $ 2,658,136,000 |
Loans Receivable Held-for-sale, Amount |  |  |  | 1,233,000 | 1,508,000 |
loans and leases receivable gross excluding loans held for sale |  |  |  | 2,606,391,000 | 2,656,628,000 |
Less [Abstract] |  |  |  |  |  |
Net deferred loan fees, premiums and discounts |  |  |  | 10,630,000 | 13,617,000 |
Allowance for loan losses | 26,189,000 | 19,977,000 | 19,977,000 | 26,704,000 | 26,189,000 | $ 20,771,000
Net loans |  |  |  | 2,569,057,000 | 2,616,822,000 |
Increase (Decrease) in loans receivable | (47,800,000) |  |  |  |  |
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 | $ 26,189,000 | 19,977,000 | 19,977,000 |  |  |
Provision for Loan and Lease Losses | 947,000 | 1,055,000 |  |  |  |
Losses charged off | (568,000) | (476,000) | (2,993,000) |  |  |
Recoveries | 136,000 | 215,000 | 538,000 |  |  |
Balance, end of period | $ 26,704,000 | 20,771,000 | 26,189,000 |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 2,515,000 | 2,044,000 | 511,000
Collectively evaluated for impairment |  |  |  | 23,484,000 | 22,910,000 | 20,255,000
Ending Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 14,282,000 | 16,980,000 | 13,079,000
Collectively evaluated for impairment |  |  |  | 2,568,096,000 | 2,611,916,000 | 1,964,365,000
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  | 2,596,994,000 | 2,644,519,000 | 1,977,697,000
Construction and land development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans |  |  |  | 50,234,000 | 51,013,000 |
Ending Balance [Abstract] |  |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  | 49,179,000 | 50,619,000 |
Agricultural real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans |  |  |  | 237,437,000 | 232,409,000 |
Ending Balance [Abstract] |  |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  | 236,864,000 | 231,700,000 |
1-4 Family residential properties |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans |  |  |  | 363,569,000 | 374,751,000 |
Ending Balance [Abstract] |  |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  | 362,617,000 | 373,518,000 |
Period When Loans are Charged-down | 180 days |  |  |  |  |
Multifamily residential properties |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans |  |  |  | 177,949,000 | 186,393,000 |
Ending Balance [Abstract] |  |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  | 175,903,000 | 184,051,000 |
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans |  |  |  | 909,176,000 | 911,656,000 |
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 |  |  |  | 905,679,000 | 906,850,000 |
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 |  |  |  | 1,738,365,000 | 1,756,222,000 |
Ending Balance [Abstract] |  |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  | 1,730,242,000 | 1,746,738,000 |
Agricultural loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans |  |  |  | 118,125,000 | 136,125,000 |
Ending Balance [Abstract] |  |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  | 118,026,000 | 135,877,000 |
Commercial and industrial loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans |  |  |  | 551,837,000 | 559,120,000 |
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 |  |  |  | 550,853,000 | 557,011,000 |
Consumer loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) | $ 243,000 | 103,000 | 602,000 |  |  |
Gross loans |  |  |  | 87,503,000 | 92,744,000 |
Less [Abstract] |  |  |  |  |  |
Allowance for loan losses | 932,000 | 803,000 | 803,000 | 1,004,000 | 932,000 | 861,000
Allowance for Loan Losses [Abstract] |  |  |  |  |  |
Balance, beginning of period | 932,000 | 803,000 | 803,000 |  |  |
Losses charged off | (271,000) | (136,000) | (787,000) |  |  |
Recoveries | 100,000 | 91,000 | 314,000 |  |  |
Balance, end of period | 1,004,000 | 861,000 | 932,000 |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 3,000 | 3,000 | 0
Collectively evaluated for impairment |  |  |  | 1,001,000 | 929,000 | 861,000
Ending Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 171,000 | 166,000 | 170,000
Collectively evaluated for impairment |  |  |  | 93,948,000 | 99,872,000 | 39,650,000
Financing Receivable, Net |  |  |  | 94,119,000 | 100,041,000 |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  | 86,540,000 | 91,516,000 | 39,820,000
All other loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans |  |  |  | 111,794,000 | 113,925,000 |
Ending Balance [Abstract] |  |  |  |  |  |
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  | 111,333,000 | 113,377,000 |
Agricultural and Farm Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans |  |  |  | 355,600,000 | 368,500,000 |
Less [Abstract] |  |  |  |  |  |
Increase (Decrease) in loans receivable | $ (12,900,000) |  |  |  |  |
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 |  |  |  | 267,100,000 | 276,100,000 |
Less [Abstract] |  |  |  |  |  |
Increase (Decrease) in loans receivable | $ (9,000,000) |  |  |  |  |
Motels and Hotels Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans |  |  |  | 128,000,000 |  |
Non-residential Buildings [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans |  |  |  | 228,300,000 |  |
Residential Buildings [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans |  |  |  | 289,200,000 |  |
Other Gambling Industries [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans |  |  |  | 103,000,000 |  |
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) | $ 584,000 | 936,000 | 6,070,000 |  |  |
Less [Abstract] |  |  |  |  |  |
Allowance for loan losses | 21,556,000 | 16,546,000 | 16,546,000 | 21,947,000 | 21,556,000 | 17,368,000
Allowance for Loan Losses [Abstract] |  |  |  |  |  |
Balance, beginning of period | 21,556,000 | 16,546,000 | 16,546,000 |  |  |
Losses charged off | (215,000) | (237,000) | (1,227,000) |  |  |
Recoveries | 22,000 | 123,000 | 167,000 |  |  |
Balance, end of period | 21,947,000 | 17,368,000 | 21,556,000 |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 2,257,000 | 1,816,000 | 486,000
Collectively evaluated for impairment |  |  |  | 18,994,000 | 18,514,000 | 16,877,000
Ending Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 10,303,000 | 14,422,000 | 11,592,000
Collectively evaluated for impairment |  |  |  | 1,747,455,000 | 1,756,908,000 | 1,417,379,000
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  | 1,770,557,000 | 1,784,741,000 | 1,429,224,000
Agricultural/ Agricultural Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) | 236,000 | (161,000) | 548,000 |  |  |
Less [Abstract] |  |  |  |  |  |
Allowance for loan losses | 2,197,000 | 1,742,000 | 1,742,000 | 2,412,000 | 2,197,000 | 1,581,000
Allowance for Loan Losses [Abstract] |  |  |  |  |  |
Balance, beginning of period | 2,197,000 | 1,742,000 | 1,742,000 |  |  |
Losses charged off | (30,000) | 0 | (93,000) |  |  |
Recoveries | 9,000 | 0 | 0 |  |  |
Balance, end of period | 2,412,000 | 1,581,000 | 2,197,000 |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 24,000 | 0 | 5,000
Collectively evaluated for impairment |  |  |  | 2,388,000 | 2,197,000 | 1,576,000
Ending Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 45,000 | 32,000 | 202,000
Collectively evaluated for impairment |  |  |  | 354,432,000 | 367,175,000 | 196,173,000
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  | 354,477,000 | 367,211,000 | 196,375,000
Residential Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) | (116,000) | 177,000 | 1,447,000 |  |  |
Less [Abstract] |  |  |  |  |  |
Allowance for loan losses | $ 1,504,000 | 886,000 | 886,000 | 1,341,000 | 1,504,000 | 961,000
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 | $ 1,504,000 | 886,000 | 886,000 |  |  |
Losses charged off | (52,000) | (103,000) | (886,000) |  |  |
Recoveries | 5,000 | 1,000 | 57,000 |  |  |
Balance, end of period | 1,341,000 | 961,000 | 1,504,000 |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 231,000 | 225,000 | 20,000
Collectively evaluated for impairment |  |  |  | 1,101,000 | 1,270,000 | 941,000
Ending Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 3,763,000 | 2,360,000 | 1,115,000
Collectively evaluated for impairment |  |  |  | 372,261,000 | 387,961,000 | 311,163,000
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  | 377,841,000 | 392,526,000 | 312,278,000
Unallocated |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) | 0 | 0 | 0 |  |  |
Less [Abstract] |  |  |  |  |  |
Allowance for loan losses | 0 | 0 | 0 | 0 | 0 | 0
Allowance for Loan Losses [Abstract] |  |  |  |  |  |
Balance, beginning of period | 0 | 0 | 0 |  |  |
Losses charged off | 0 | 0 | 0 |  |  |
Recoveries | 0 | 0 | 0 |  |  |
Balance, end of period | $ 0 | $ 0 | $ 0 |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 0 | 0 | 0
Collectively evaluated for impairment |  |  |  | 0 | 0 | 0
Ending Balance [Abstract] |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 0 | 0 | 0
Collectively evaluated for impairment |  |  |  | 0 | 0 | 0
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income |  |  |  | 0 | 0 | 0
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |
Less [Abstract] |  |  |  |  |  |
Net loans |  |  |  | 13,911,000 | 14,388,000 |
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  | 705,000 | 1,235,000 | 5,000
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Net |  |  |  | 14,616,000 | 15,623,000 | 253,000
Financial Asset Acquired with Credit Deterioration [Member] | Construction and land development |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Net |  |  |  | 278,000 | 2,558,000 |
Financial Asset Acquired with Credit Deterioration [Member] | Agricultural real estate |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Net |  |  |  | 0 | 0 |
Financial Asset Acquired with Credit Deterioration [Member] | 1-4 Family residential properties |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Net |  |  |  | 1,817,000 | 2,206,000 |
Financial Asset Acquired with Credit Deterioration [Member] | Multifamily residential properties |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Net |  |  |  | 3,864,000 | 3,891,000 |
Financial Asset Acquired with Credit Deterioration [Member] | Agricultural loans |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Net |  |  |  | 0 | 4,000 |
Financial Asset Acquired with Credit Deterioration [Member] | Commercial and industrial loans |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Net |  |  |  | 0 | 15,000 |
Financial Asset Acquired with Credit Deterioration [Member] | Consumer loans |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  | 0 | 0 | 0
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Net |  |  |  | 0 | 3,000 | 0
Financial Asset Acquired with Credit Deterioration [Member] | Commercial/ Commercial Real Estate |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  | 696,000 | 1,226,000 | 5,000
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Net |  |  |  | 12,799,000 | 13,411,000 | 253,000
Financial Asset Acquired with Credit Deterioration [Member] | Agricultural/ Agricultural Real Estate |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  | 0 | 0 | 0
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Net |  |  |  | 0 | 4,000 | 0
Financial Asset Acquired with Credit Deterioration [Member] | Residential Real Estate |  |  |  |  |  |
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  | 9,000 | 9,000 | 0
Ending Balance [Abstract] |  |  |  |  |  |
Financing Receivable, Net |  |  |  | 1,817,000 | 2,205,000 | 0
Financial Asset Acquired with Credit Deterioration [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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- Definition The useful life of the loan receivable. + References No definition available. + Details
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- Definition The period of time when the final, large payment is due on a real estate loan. + References No definition available. + Details
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- Definition The ratio used to analyze the amount of debt that can be supported by the cash flow generated from the property. The calculation is the net income generated by the property divided by the commercial mortgage payment. + References No definition available. + Details
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- Definition The amount of the mortgage loan as a percentage of the total appraised value of the real property. Loan-to-value is one of the key risk factors that lenders assess when qualifying borrowers for a mortgage. + References No definition available. + Details
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- Definition Specifies the time period covered by the loan receivable. + References No definition available. + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes Loans held-for-sale and loans and leases covered under loss sharing agreements. + References No definition available. + Details
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- Definition Minimum value of loans individually measured for impairment. + References No definition available. + Details
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- Definition Number of alternatives for measuring impaired loans receivable. + References No definition available. + Details
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- Definition The amount of time when past due loans receivable are written-off. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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