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Loans, Trouble Debt Restructuring (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) Contract | Sep. 30, 2016 USD ($) Contract | Sep. 30, 2017 USD ($) Contract | Sep. 30, 2016 USD ($) Contract | Dec. 31, 2016 USD ($)
Loans [Abstract] |  |  |  |  |
Reserves of allowance for loan losses | $ 85 |  | $ 85 |  | $ 29
Financing receivable modifications [Abstract] |  |  |  |  |
Number of contract, subsequently defaults | Contract | 0 | 0 | 0 | 0 |
Interest Modification [Member] |  |  |  |  |
Financing receivable modifications [Abstract] |  |  |  |  |
Number of contracts | Contract | 0 | 0 | 0 | 0 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 0 | $ 0 |
Post-modification outstanding recorded investment | $ 0 | $ 0 | $ 0 | $ 0 |
Term Modification [Member] |  |  |  |  |
Financing receivable modifications [Abstract] |  |  |  |  |
Number of contracts | Contract | 3 | 4 | 10 | 7 |
Pre-modification outstanding recorded investment | $ 311 | $ 3,826 | $ 7,108 | $ 4,264 |
Post-modification outstanding recorded investment | $ 311 | $ 3,826 | $ 7,108 | $ 4,264 |
Real Estate Loans [Member] | Commercial [Member] | Interest Modification [Member] |  |  |  |  |
Financing receivable modifications [Abstract] |  |  |  |  |
Number of contracts | Contract |  | 0 | 0 | 0 |
Pre-modification outstanding recorded investment |  | $ 0 | $ 0 | $ 0 |
Post-modification outstanding recorded investment |  | $ 0 | $ 0 | $ 0 |
Real Estate Loans [Member] | Commercial [Member] | Term Modification [Member] |  |  |  |  |
Financing receivable modifications [Abstract] |  |  |  |  |
Number of contracts | Contract |  | 1 | 7 | 4 |
Pre-modification outstanding recorded investment |  | $ 750 | $ 6,797 | $ 1,188 |
Post-modification outstanding recorded investment |  | $ 750 | $ 6,797 | $ 1,188 |
Real Estate Loans [Member] | Agricultural [Member] | Interest Modification [Member] |  |  |  |  |
Financing receivable modifications [Abstract] |  |  |  |  |
Number of contracts | Contract | 0 |  | 0 |  |
Pre-modification outstanding recorded investment | $ 0 |  | $ 0 |  |
Post-modification outstanding recorded investment | $ 0 |  | $ 0 |  |
Real Estate Loans [Member] | Agricultural [Member] | Term Modification [Member] |  |  |  |  |
Financing receivable modifications [Abstract] |  |  |  |  |
Number of contracts | Contract | 2 |  | 2 |  |
Pre-modification outstanding recorded investment | $ 150 |  | $ 150 |  |
Post-modification outstanding recorded investment | $ 150 |  | $ 150 |  |
Other Commercial Loans [Member] | Interest Modification [Member] |  |  |  |  |
Financing receivable modifications [Abstract] |  |  |  |  |
Number of contracts | Contract |  | 0 |  | 0 |
Pre-modification outstanding recorded investment |  | $ 0 |  | $ 0 |
Post-modification outstanding recorded investment |  | $ 0 |  | $ 0 |
Other Commercial Loans [Member] | Term Modification [Member] |  |  |  |  |
Financing receivable modifications [Abstract] |  |  |  |  |
Number of contracts | Contract |  | 3 |  | 3 |
Pre-modification outstanding recorded investment |  | $ 3,076 |  | $ 3,076 |
Post-modification outstanding recorded investment |  | $ 3,076 |  | $ 3,076 |
Other Agricultural Loans [Member] | Interest Modification [Member] |  |  |  |  |
Financing receivable modifications [Abstract] |  |  |  |  |
Number of contracts | Contract | 0 |  | 0 |  |
Pre-modification outstanding recorded investment | $ 0 |  | $ 0 |  |
Post-modification outstanding recorded investment | $ 0 |  | $ 0 |  |
Other Agricultural Loans [Member] | Term Modification [Member] |  |  |  |  |
Financing receivable modifications [Abstract] |  |  |  |  |
Number of contracts | Contract | 1 |  | 1 |  |
Pre-modification outstanding recorded investment | $ 161 |  | $ 161 |  |
Post-modification outstanding recorded investment | $ 161 |  | $ 161 |  |

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