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Business Combinations - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2020 | May 01, 2019 | Apr. 02, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 01, 2018 | Oct. 02, 2018 | May 01, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 349,398 | $ 236,347 | $ 150,601 |  |  |
Loans |  |  |  | 28,881,496 | 25,523,276 |  |  |  |
Deposits |  |  |  | 34,431,236 | 30,672,460 |  |  |  |
Merger-related expenses |  |  |  | 17,166 | 6,462 | $ 9,015 |  |  |
Community Financial Holding Co. Inc. | Subsequent Event |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash paid to acquire business | $ 2,300 |  |  |  |  |  |  |  |
Total assets acquired | 224,000 |  |  |  |  |  |  |  |
Loans | 136,900 |  |  |  |  |  |  |  |
Deposits acquired | $ 211,800 |  |  |  |  |  |  |  |
Entegra Financial |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total assets acquired |  |  |  | 1,681,324 |  |  |  |  |
Deposits acquired |  |  |  | $ 1,326,967 |  |  |  |  |
Share price (usd per share) |  |  |  | $ 30.18 |  |  |  |  |
Purchase Price |  |  |  | $ 222,750 |  |  |  |  |
Non-PCI loans acquired |  |  |  | 953,700 |  |  |  |  |
PCI loans acquired |  |  |  | 77,500 |  |  |  |  |
Intangible assets |  |  |  | 4,500 |  |  |  |  |
Total liabilities assumed |  |  |  | 1,511,208 |  |  |  |  |
Goodwill |  |  |  | 52,634 |  |  |  |  |
Loans |  |  |  | 1,031,186 |  |  |  |  |
Merger-related expenses |  |  |  | 5,400 |  |  |  |  |
Intangible assets |  |  |  | 6,899 |  |  |  |  |
First South Bancorp |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total assets acquired |  | $ 239,151 |  |  |  |  |  |  |
Deposits acquired |  | $ 207,556 |  |  |  |  |  |  |
Share price (usd per share) |  | $ 1.15 |  |  |  |  |  |  |
Purchase Price |  | $ 37,486 |  |  |  |  |  |  |
Non-PCI loans acquired |  | 162,800 |  |  |  |  |  |  |
PCI loans acquired |  | 16,400 |  |  |  |  |  |  |
Intangible assets |  | 2,268 |  |  |  |  |  |  |
Total liabilities assumed |  | 215,561 |  | 1,067 | 0 |  |  |  |
Goodwill |  | 13,896 |  |  |  |  |  |  |
Loans |  | $ 179,243 |  |  |  |  |  |  |
Interest And Fee Income, Loans, Consumer And Commercial |  |  |  | 6,100 |  |  |  |  |
Merger-related expenses |  |  |  | 4,100 |  |  |  |  |
Biscayne Bancshares |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total assets acquired |  |  | $ 1,029,184 |  |  |  |  |  |
Share price (usd per share) |  |  | $ 25.05 |  |  |  |  |  |
Purchase Price |  |  | $ 118,949 |  |  |  |  |  |
Non-PCI loans acquired |  |  | 850,400 |  |  |  |  |  |
PCI loans acquired |  |  | 13,000 |  |  |  |  |  |
Intangible assets |  |  | 4,700 |  |  |  |  |  |
Total liabilities assumed |  |  | 956,756 | 1,138 | 0 |  |  |  |
Goodwill |  |  | 46,521 |  |  |  |  |  |
Loans |  |  | 863,384 |  |  |  |  |  |
Deposits |  |  | 786,500 |  |  |  |  |  |
Interest And Fee Income, Loans, Consumer And Commercial |  |  |  | 33,800 |  |  |  |  |
Deposits |  |  | 786,512 |  |  |  |  |  |
Merger-related expenses |  |  |  | 5,800 |  |  |  |  |
Intangible assets |  |  | $ 4,745 |  |  |  |  |  |
Palmetto Heritage Bancshares |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total assets acquired |  |  |  |  |  |  | $ 162,200 |  |
Deposits acquired |  |  |  |  |  |  | 124,900 |  |
Non-PCI loans acquired |  |  |  |  |  |  | 131,300 |  |
PCI loans acquired |  |  |  |  |  |  | 3,900 |  |
Total liabilities assumed |  |  |  |  |  |  | 149,300 |  |
Goodwill |  |  |  |  |  |  | 17,500 |  |
Merger-related expenses |  |  |  | 600 | 500 |  |  |  |
Revenue of acquired business |  |  |  | 5,600 | 1,200 |  |  |  |
Palmetto Heritage Bancshares | Core deposits |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 1,700 |  |
Capital Commerce Bancorp |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total assets acquired |  |  |  |  |  |  |  | $ 221,900 |
Deposits acquired |  |  |  |  |  |  |  | 172,400 |
Non-PCI loans acquired |  |  |  |  |  |  |  | 173,400 |
PCI loans acquired |  |  |  |  |  |  |  | 10,800 |
Total liabilities assumed |  |  |  | 0 | 808 |  |  | 204,500 |
Goodwill |  |  |  |  |  |  |  | 10,700 |
Merger-related expenses |  |  |  | 700 | 1,200 |  |  |  |
Revenue of acquired business |  |  |  | 8,100 | 3,200 |  |  |  |
Capital Commerce Bancorp | Core deposits |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | $ 2,700 |
HomeBancorp Inc. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total assets acquired |  |  |  |  |  |  |  |  | $ 842,700
Deposits acquired |  |  |  |  |  |  |  |  | 619,600
Non-PCI loans acquired |  |  |  |  |  |  |  |  | 550,600
PCI loans acquired |  |  |  |  |  |  |  |  | 15,600
Total liabilities assumed |  |  |  |  |  |  |  |  | 787,700
Goodwill |  |  |  |  |  |  |  |  | 57,600
Merger-related expenses |  |  |  | 100 | 2,300 |  |  |  |
Revenue of acquired business |  |  |  | 21,400 | $ 17,400 |  |  |  |
HomeBancorp Inc. | Core deposits |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  | $ 9,900
North Carolina Branches |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Loans and leases |  |  |  | 106,400 |  |  |  |  |
Premises and equipment |  |  |  | 2,300 |  |  |  |  |
Deposits |  |  |  | $ 186,400 |  |  |  |  |

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