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Basis of Accounting and Consolidation - Schedule of Impact of ASU 2016-13 Adoption (Details) - USD ($) | Jun. 30, 2020 | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | $ 38,381,000 | $ 32,876,000 |  | $ 26,911,000 | $ 26,359,000 | $ 26,704,000 | $ 26,189,000
Pre-ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 26,911,000 |  |  |
Allowance for credit losses on off-balance sheet exposures |  |  |  | 0 |  |  |
ASU 2016-13 |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | $ 28,583,000 |  |  |  |
Allowance for credit losses on off-balance sheet exposures |  |  | 69,000 |  |  |  |
ASU 2016-13 | Impact of ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 1,672,000 |  |  |  |
Allowance for credit losses on off-balance sheet exposures |  |  | 69,000 |  |  |  |
Construction & Land Development | Pre-ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 1,146,000 |  |  |
Construction & Land Development | ASU 2016-13 |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 1,033,000 |  |  |  |
Construction & Land Development | ASU 2016-13 | Impact of ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | (113,000) |  |  |  |
Farm | Pre-ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 1,093,000 |  |  |
Farm | ASU 2016-13 |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 1,323,000 |  |  |  |
Farm | ASU 2016-13 | Impact of ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 230,000 |  |  |  |
1-4 Family Residential Properties | Pre-ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 1,386,000 |  |  |
1-4 Family Residential Properties | ASU 2016-13 |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 2,142,000 |  |  |  |
1-4 Family Residential Properties | ASU 2016-13 | Impact of ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 756,000 |  |  |  |
Commercial Real Estate | Pre-ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 11,198,000 |  |  |
Commercial Real Estate | ASU 2016-13 |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 11,739,000 |  |  |  |
Commercial Real Estate | ASU 2016-13 | Impact of ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 541,000 |  |  |  |
Agricultural | Pre-ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 1,386,000 |  |  |
Agricultural | ASU 2016-13 |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 1,023,000 |  |  |  |
Agricultural | ASU 2016-13 | Impact of ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | (363,000) |  |  |  |
Commercial & Industrial | Pre-ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 9,273,000 |  |  |
Commercial & Industrial | ASU 2016-13 |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 9,428,000 |  |  |  |
Commercial & Industrial | ASU 2016-13 | Impact of ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 155,000 |  |  |  |
Consumer | Pre-ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | $ 1,429,000 |  |  |
Consumer | ASU 2016-13 |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 1,895,000 |  |  |  |
Consumer | ASU 2016-13 | Impact of ASU |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | $ 466,000 |  |  |  |

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