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Acquisitions - Mid Illinois Bancorp, Inc. (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2017 | Jul. 02, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition |  |  |  |  |
Per share cash consideration entitled (in dollars per share) |  | $ 1.35 |  |  |
Consideration paid: |  |  |  |  |
Goodwill |  |  | $ 311,536 | $ 267,685 |
Impairment charge |  |  | 2,026 | 817 | $ 99
Core deposit intangible assets |  |  |  |  |
Consideration paid: |  |  |  |  |
Intangible asset recorded |  |  | 90,256 |  |
Non-recurring basis |  |  |  |  |
Consideration paid: |  |  |  |  |
Bank properties held for sale, net |  |  | 4,004 | 1,832 |
Mid Illinois Bancorp, Inc. |  |  |  |  |
Business Acquisition |  |  |  |  |
Per share cash consideration entitled (in dollars per share) | $ 227.94 |  |  |  |
Number of common shares issued for acquisition | 7.5149 |  |  |  |
Assets acquired: |  |  |  |  |
Cash and cash equivalents | $ 39,443 |  |  |  |
Securities | 208,003 |  |  |  |
Loans held for sale | 5,031 |  |  |  |
Portfolio loans | 356,651 |  |  |  |
Premises and equipment | 16,551 |  |  |  |
Other intangible assets | 11,531 |  |  |  |
Other assets | 29,564 |  |  |  |
Total assets acquired | 666,774 |  |  |  |
Liabilities assumed: |  |  |  |  |
Deposits | 505,917 |  |  |  |
Other borrowings | 61,040 |  |  |  |
Other liabilities | 10,497 |  |  |  |
Total liabilities assumed | 577,454 |  |  |  |
Net assets acquired | 89,320 |  |  |  |
Consideration paid: |  |  |  |  |
Cash | 40,507 |  |  |  |
Common stock | 97,702 |  |  |  |
Total consideration paid | 138,209 |  |  |  |
Goodwill | 48,889 |  |  |  |
Aggregate principal outstanding | 362,400 |  |  |  |
Fair value of performing loans, including loans held for sale | 357,000 |  |  |  |
Amount expected to be accreted, gross | 5,400 |  |  |  |
Contractual amount of PCI loans | 7,600 |  |  |  |
Fair value of credit-impaired loans | $ 4,700 |  |  |  |
PCI loan outstanding amount |  |  | 100 |  |
Mixed consideration in cash (in dollars per share) | $ 68.38 |  |  |  |
Mixed consideration in shares (in dollars per share) | 5.2604 |  |  |  |
Total consideration in stock (as a percent) | 70.00% |  |  |  |
Total consideration in cash (as a percent) | 30.00% |  |  |  |
Mid Illinois Bancorp, Inc. | Non-interest expense |  |  |  |  |
Business Acquisition |  |  |  |  |
Business acquisition expenses |  |  | $ 3,100 |  | $ 2,500
Acquisition expenses related to professional and legal fees |  |  |  | $ 1,300 |

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