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Business Combinations (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 5 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 24, 2019 | May 01, 2019 | Apr. 23, 2019 | Apr. 02, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Merger-related expenses |  |  |  |  | $ 3,892 | $ 1,126 |  |  | $ 9,695 | $ 4,136 |
Goodwill recorded for First South Bancorp |  |  |  |  | 296,764 |  | $ 296,764 | $ 296,764 | 296,764 |  | $ 236,347
Community Financial |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 2,300 |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  | 223,500 |  | 223,500 | 223,500 | 223,500 |  |
Deposits |  |  |  |  | 211,300 |  | 211,300 | 211,300 | 211,300 |  |
Loans |  |  |  |  | 147,000 |  | 147,000 | 147,000 | 147,000 |  |
First South Bancorp |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Merger-related expenses |  |  |  |  | 2,500 |  |  |  | 3,900 |  |
Interest income |  |  |  |  |  |  | 4,000 |  |  |  |
Share price (usd per share) |  | $ 1.15 |  |  |  |  |  |  |  |  |
Purchase price |  | $ 37,486 |  |  |  |  |  |  |  |  |
Assets |  | 239,151 |  |  |  |  |  |  |  |  |
Deposits |  | 207,556 |  |  |  |  |  |  |  |  |
Intangible assets |  | 2,268 |  |  |  |  |  |  |  |  |
Liabilities assumed |  | 215,561 |  |  |  |  |  |  |  |  |
Goodwill recorded for First South Bancorp |  | $ 13,896 |  |  |  |  |  |  |  |  |
Entegra Financial |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share price (usd per share) |  |  | $ 30.18 |  |  |  |  |  |  |  |
Purchase price |  |  | $ 219,800 |  |  |  |  |  |  |  |
Assets |  |  |  |  | 1,700,000 |  | 1,700,000 | 1,700,000 | 1,700,000 |  |
Deposits |  |  |  |  | 1,280,000 |  | 1,280,000 | 1,280,000 | 1,280,000 |  |
Loans |  |  |  |  | 1,090,000 |  | 1,090,000 | 1,090,000 | 1,090,000 |  |
Biscayne Bancshares |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Merger-related expenses |  |  |  |  | 600 |  |  |  | 3,500 |  |
Interest income |  |  |  |  |  |  |  | 22,600 |  |  |
Share price (usd per share) |  |  |  | $ 25.05 |  |  |  |  |  |  |
Purchase price |  |  |  | $ 118,949 |  |  |  |  |  |  |
Assets |  |  |  | 1,029,184 |  |  |  |  |  |  |
Deposits |  |  |  | 786,512 |  |  |  |  |  |  |
Intangible assets |  |  |  | 4,745 |  |  |  |  |  |  |
Liabilities assumed |  |  |  | 956,756 |  |  |  |  |  |  |
Goodwill recorded for First South Bancorp |  |  |  | $ 46,521 |  |  |  |  |  |  |
Non-PCI Loans | First South Bancorp |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans acquired |  |  |  |  | 162,845 |  | 162,845 | 162,845 | 162,845 |  |
Non-PCI Loans | Biscayne Bancshares |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans acquired |  |  |  |  | 850,352 |  | 850,352 | 850,352 | 850,352 |  |
PCI Loans | First South Bancorp |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans acquired |  |  |  |  | 16,398 |  | 16,398 | 16,398 | 16,398 |  |
PCI Loans | Biscayne Bancshares |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans acquired |  |  |  |  | $ 13,032 |  | $ 13,032 | $ 13,032 | $ 13,032 |  |

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