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Business Combinations (Additional Information) (Details) $ / shares in Units, $ in Thousands | Jul. 01, 2019 USD ($) office $ / shares shares | Jun. 30, 2020 USD ($) office | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 28, 2019 $ / shares | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of banking offices | office |  | 74 |  |  |  |  |  |
Assets |  | $ 4,851,051 |  | $ 4,397,672 |  |  |  |
Equity |  | 594,674 | $ 583,540 | 573,820 | $ 499,411 |  | $ 479,187 | $ 458,640
Goodwill |  | $ 121,956 |  | $ 121,306 |  |  |  |
Citizens First |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Direct acquisition costs | $ 3,300 |  |  |  |  |  |  |
Goodwill | 17,739 |  |  |  |  |  |  |
Intangible assets | 4,547 |  |  |  |  |  |  |
Non-deductible goodwill for tax purposes | $ 17,700 |  |  |  |  |  |  |
Cash portion, cash per share for common stock converted (USD per share) | $ / shares | $ 5.80 |  |  |  |  |  |  |
Number of the Company's common stock for each share converted (in shares) | shares | 0.6629 |  |  |  |  |  |  |
Shares of common stock issued for acquisition (in shares) | shares | 1,664,000 |  |  |  |  |  |  |
Aggregate amount of cash consideration paid | $ 15,500 |  |  |  |  |  |  |
Citizens First | Acquired Non-impaired Loans |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair value of non-impaired loans and customers receivables acquired | 349,900 |  |  |  |  |  |  |
Unpaid principal balance non-impaired loans and customers receivables acquired | 353,300 |  |  |  |  |  |  |
Citizens First | CFB 401(k) Plan Shares |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash portion, cash per share for common stock converted (USD per share) | $ / shares |  |  |  |  |  | $ 25.77 |  |
Additional cash per share for common stock converted (USD per share) | $ / shares |  |  |  |  |  | $ 5.80 |  |
Citizens First | Core Deposits |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets | $ 4,500 |  |  |  |  |  |  |
Weighted average useful live of acquired intangibles | 8 years |  |  |  |  |  |  |
Citizens First |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of banking offices | office | 8 |  |  |  |  |  |  |
Assets | $ 456,000 |  |  |  |  |  |  |
Equity | $ 49,800 |  |  |  |  |  |  |

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