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Mergers and Acquisitions - Summary of the Allocation of Purchase Price to Assets and Liabilities Acquired (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Purchase Price: |  |  |  |
Common stock issued in acquisition of businesses |  | $ 0 | $ 434,519 | $ 213,590
Increase (decrease) to net assets as a result of fair value adjustments to assets acquired and liabilities assumed: |  |  |  |
Goodwill resulting from merger |  | $ 939,683 | $ 932,928 | $ 611,046
Brand Group Holdings, Inc. |  |  |  |
Purchase Price: |  |  |  |
Shares issued to common shareholders (in shares) | 9,306,477 |  |  |
Purchase price per share (usd per share) | $ 46.69 |  |  |
Common stock issued in acquisition of businesses | $ 434,519 |  |  |
Cash consideration paid | 21,879 |  |  |
Cash paid for fractional shares | 4 |  |  |
Cash settlement for stock options, net of tax benefit | 17,157 |  |  |
Deal charges paid on behalf of Brand | 894 |  |  |
Total Purchase Price | 474,453 |  |  |
Increase (decrease) to net assets as a result of fair value adjustments to assets acquired and liabilities assumed: |  |  |  |
Securities | (323) |  |  |
Loans, including loans held for sale | (27,611) |  |  |
Premises and equipment | 910 |  |  |
Intangible assets | 27,534 |  |  |
Other assets | (4,495) |  |  |
Deposits | (1,367) |  |  |
Borrowings | (2,023) |  |  |
Other liabilities | 13,338 |  |  |
Deferred income taxes | 957 |  |  |
Total Net Assets Acquired | 145,816 |  |  |
Goodwill resulting from merger | 328,637 |  |  |
Brand Group Holdings, Inc. | Brand Group Holdings, Inc. |  |  |  |
Net Assets Acquired: |  |  |  |
Stockholders’ equity at acquisition date | $ 138,896 |  |  |

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