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Loans and Allowance for Loan and Lease Losses - Schedule of Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan | Dec. 31, 2015 USD ($) loan
Accounts Notes And Loans Receivable [Line Items] |  |  |
Pre Modification Recorded Investment | $ |  | $ 18,214 |
Number of Loans | loan |  | 31 |
Commercial Loans |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Pre Modification Recorded Investment | $ | $ 8,831 | $ 16,612 | $ 1,544
Number of Loans | loan | 8 | 27 | 4
Commercial real estate |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Pre Modification Recorded Investment | $ |  | $ 809 |
Number of Loans | loan |  | 3 |
Farmland |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Pre Modification Recorded Investment | $ |  | $ 793 |
Number of Loans | loan |  | 1 |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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