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Mergers and Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Aug. 20, 2018 | Jun. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Total Assets |  | $ 12,494,653 | $ 12,458,632
Portfolio loans, net of unearned income |  | 7,737,854 | $ 7,656,281
Farmers Capital Bank Corporation [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total Assets | $ 1,600,000 |  |
Portfolio loans, net of unearned income | 1,000,000 |  |
Securities | 239,321 |  |
Value of acquisition | $ 428,901 |  |
Closing stock price | $ 49.40 |  |
Number of shares issued for acquisition | 7,920,387 |  |
Cash consideration for outstanding FFKT shares | $ 37,634 |  |
Goodwill acquired | 220,897 |  |
Purchase price allocation in core deposit intangible | 39,992 |  |
Merger related expense |  | $ 3,200 |
Community Banking [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price allocation in core deposit intangible | 37,400 |  |
Trust And Investment Services [Member] | Customer Relationships [Member] | Farmers Capital Bank Corporation [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price allocation in core deposit intangible | $ 2,600 |  |

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