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Loans and Allowance - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Receivables [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Loans held for sale | $ 4,778 |  |  |  | $ 7,216 |  |  |  | $ 4,778 | $ 7,216 |  |
Allowance for loan losses | 80,552 |  |  |  | 75,032 |  |  |  | 80,552 | 75,032 | $ 66,037 | $ 62,453
Increase in allowance for loan losses |  |  |  |  |  |  |  |  | 5,520 |  |  |
Net charge offs |  |  |  |  |  |  |  |  | 1,707 |  |  |
Increase in net charge offs |  |  |  |  |  |  |  |  | 1,559 |  |  |
Provision for loan losses | 1,664 | $ 1,400 | $ 1,663 | $ 2,500 | 1,800 | $ 2,083 | $ 2,875 | $ 2,385 | 7,227 | 9,143 | 5,657 |
Increase in provision for loan losses |  |  |  |  |  |  |  |  | 1,916 |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans | 7,224,467 |  |  |  | 6,751,199 |  |  |  | 7,224,467 | 6,751,199 |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans | 15,784 |  |  |  | 24,954 |  |  |  | 15,784 | 24,954 |  |
Commercial and consumer loan | Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans | 1,541 |  |  |  | 315 |  |  |  | $ 1,541 | 315 |  |
Commercial and farmland |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of troubled debt restructured loans |  |  |  |  |  |  |  |  | 79.00% |  |  |
Residential |  |  |  |  |  |  |  |  |  |  |  |
Receivables [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses | 14,322 |  |  |  | 13,537 |  |  |  | $ 14,322 | 13,537 | 11,755 | $ 11,139
Provision for loan losses |  |  |  |  |  |  |  |  | 1,969 | 2,391 | $ 1,515 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans | 1,494,578 |  |  |  | 1,476,786 |  |  |  | 1,494,578 | 1,476,786 |  |
Mortgage loans for which formal foreclosure proceedings are in process | 800 |  |  |  | 2,302 |  |  |  | 800 | 2,302 |  |
Residential | Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans | $ 1,293 |  |  |  | $ 1,536 |  |  |  | $ 1,293 | $ 1,536 |  |

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