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MERGER - Purchase Price Allocation (Details) - USD ($) $ in Thousands | Feb. 01, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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MERGER |  |  |  |  |
Increase to goodwill resulting from merger | $ 458 |  |  |  |
Fair value of assets acquired: |  |  |  |  |
Premises and fixed assets | 37,900 |  |  |  |
Operating lease assets | 45,600 |  |  |  |
Fair value of liabilities assumed: |  |  |  |  |
Deposits | 5,410,000 |  |  |  |
Operating lease liabilities | 45,300 |  |  |  |
Total liabilities assumed |  | $ 5,847,505 |  |  |
Goodwill resulting from Merger |  | $ 155,797 | $ 55,638 | $ 55,638 | $ 55,638
Bridge assets acquired |  |  |  |  |
Purchase price consideration: |  |  |  |  |
Purchase price consideration | 491,210 |  |  |  |
Fair value of assets acquired: |  |  |  |  |
Cash and due from banks | 715,988 |  |  |  |
Securities available-for-sale | 651,997 |  |  |  |
Loans held for sale | 10,000 |  |  |  |
Loans held for investment | 4,531,640 |  |  |  |
Premises and fixed assets | 37,881 |  |  |  |
Restricted stock | 23,362 |  |  |  |
BOLI | 94,085 |  |  |  |
Other intangible assets | 10,984 |  |  |  |
Operating lease assets | 45,603 |  |  |  |
Other assets | 117,016 |  |  |  |
Total assets acquired | 6,238,556 |  |  |  |
Fair value of liabilities assumed: |  |  |  |  |
Deposits | 5,405,575 |  |  |  |
Other short-term borrowings | 216,298 |  |  |  |
Subordinated debt | 83,200 |  |  |  |
Operating lease liabilities | 45,285 |  |  |  |
Other liabilities | 97,147 |  |  |  |
Total liabilities assumed | 5,847,505 |  |  |  |
Fair value of net identifiable assets | 391,051 |  |  |  |
Goodwill resulting from Merger | $ 100,159 |  |  |  |

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