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Business Combinations - Narrative (Details) - USD ($) |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 10, 2019 | Nov. 15, 2018 | Nov. 01, 2018 | Oct. 02, 2018 | May 01, 2018 | Dec. 18, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | May 05, 2017 | Jan. 13, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  | $ 35,408,629,000 | $ 34,527,512,000 |  |  |
Loans and Leases |  |  |  |  |  |  | 25,523,276,000 | 23,596,825,000 |  |  |
Deposits |  |  |  |  |  |  | 30,672,460,000 | 29,266,275,000 |  |  |
PCI loans |  |  |  |  |  |  | 30,190,000 | 199,682,000 | $ 80,690,000 |  |
Goodwill recorded for Palmetto Heritage |  |  |  |  |  |  | 236,347,000 | 150,601,000 | 150,601,000 |  |
Merger-related expenses |  |  |  |  |  |  | 6,462,000 | 9,015,000 | 5,341,000 |  |
Gain on acquisitions |  |  |  |  |  |  | 0 | 134,745,000 | $ 5,831,000 |  |
First South Bancorp |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  | 238,500,000 |  |  |  |
Loans and Leases |  |  |  |  |  |  | 180,900,000 |  |  |  |
Deposits |  |  |  |  |  |  | 204,100,000 |  |  |  |
First South Bancorp | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share price (usd per share) | $ 1.15 |  |  |  |  |  |  |  |  |  |
Purchase Price | $ 37,500,000 |  |  |  |  |  |  |  |  |  |
Biscayne Bancshares |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share price (usd per share) |  | $ 25.05 |  |  |  |  |  |  |  |  |
Purchase Price |  | $ 118,700,000 |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  | 1,010,000,000 |  |  |  |
Loans and Leases |  |  |  |  |  |  | 850,300,000 |  |  |  |
Deposits |  |  |  |  |  |  | 746,400,000 |  |  |  |
Palmetto Heritage Bancshares |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share price (usd per share) |  |  | $ 135.00 |  |  |  |  |  |  |  |
Purchase Price |  |  | $ 30,426,000 |  |  |  |  |  |  |  |
Total assets acquired |  |  | 162,248,000 |  |  |  |  |  |  |  |
Total non-PCI loans and leases |  |  |  |  |  |  | 131,283,000 |  |  | $ 131,300,000 |
PCI loans |  |  | 3,863,000 |  |  |  |  |  |  | 3,863,000 |
Total liabilities assumed |  |  | 149,272,000 |  |  |  |  |  |  |  |
Deposits |  |  | 124,892,000 |  |  |  |  |  |  |  |
Goodwill recorded for Palmetto Heritage |  |  | 17,450,000 |  |  |  |  |  |  |  |
Merger-related expenses |  |  |  |  |  |  | 546,000 |  |  |  |
Revenue of acquired business |  |  |  |  |  |  | 1,200,000 |  |  |  |
Intangible assets |  |  | 1,706,000 |  |  |  |  |  |  |  |
Palmetto Heritage Bancshares | Core deposits |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Core deposit intangibles |  |  | $ 1,700,000 |  |  |  |  |  |  |  |
Capital Commerce Bancorp |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share price (usd per share) |  |  |  | $ 4.75 |  |  |  |  |  |  |
Purchase Price |  |  |  | $ 28,063,000 |  |  |  |  |  |  |
Total assets acquired |  |  |  | 221,887,000 |  |  |  |  |  |  |
Total non-PCI loans and leases |  |  |  |  |  |  | 173,354,000 |  |  | 173,400,000 |
PCI loans |  |  |  | 10,772,000 |  |  |  |  |  | 10,772,000 |
Total liabilities assumed |  |  |  | 204,504,000 |  |  |  |  |  |  |
Deposits |  |  |  | 172,387,000 |  |  |  |  |  |  |
Goodwill recorded for Palmetto Heritage |  |  |  | 10,680,000 |  |  |  |  |  |  |
Merger-related expenses |  |  |  |  |  |  | 1,200,000 |  |  |  |
Revenue of acquired business |  |  |  |  |  |  | 3,200,000 |  |  |  |
Intangible assets |  |  |  | 2,680,000 |  |  |  |  |  |  |
Capital Commerce Bancorp | Core deposits |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Core deposit intangibles |  |  |  | $ 2,700,000 |  |  |  |  |  |  |
HomeBancorp Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share price (usd per share) |  |  |  |  |  | $ 15.03 |  |  |  |  |
Purchase Price |  |  |  |  | $ 112,657,000 | $ 112,700,000 |  |  |  |  |
Total assets acquired |  |  |  |  | 842,693,000 |  |  |  |  |  |
Total non-PCI loans and leases |  |  |  |  |  |  | 550,618,000 |  |  | 550,600,000 |
PCI loans |  |  |  |  | 15,555,000 |  |  |  |  | 15,555,000 |
Total liabilities assumed |  |  |  |  | 787,652,000 |  |  |  |  |  |
Deposits |  |  |  |  | 619,589,000 |  |  |  |  |  |
Goodwill recorded for Palmetto Heritage |  |  |  |  | 57,616,000 |  |  |  |  |  |
Merger-related expenses |  |  |  |  |  |  | 2,300,000 |  |  |  |
Revenue of acquired business |  |  |  |  |  |  | 17,400,000 |  |  |  |
Intangible assets |  |  |  |  | 13,206,000 |  |  |  |  |  |
HomeBancorp Inc. | Core deposits |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Core deposit intangibles |  |  |  |  | $ 9,900,000 |  |  |  |  |  |
Guaranty Bank |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total assets acquired |  |  |  |  |  |  |  |  |  | 875,100,000 |
Total non-PCI loans and leases |  |  |  |  |  |  | 574,553,000 |  |  | 574,600,000 |
PCI loans |  |  |  |  |  |  |  |  |  | 114,533,000 |
Total liabilities assumed |  |  |  |  |  |  |  |  |  | 982,700,000 |
Deposits |  |  |  |  |  |  |  |  |  | 982,300,000 |
Merger-related expenses |  |  |  |  |  |  | 2,300,000 | 7,400,000 |  |  |
Gain on acquisitions |  |  |  |  |  |  | 122,700,000 |  |  |  |
Revenue of acquired business |  |  |  |  |  |  | 17,300,000 | 20,500,000 |  |  |
Guaranty Bank | Core deposits |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Core deposit intangibles |  |  |  |  |  |  |  |  |  | $ 9,900,000 |
Harvest Community Bank |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total assets acquired |  |  |  |  |  |  |  |  |  |  | $ 111,600,000
PCI loans |  |  |  |  |  |  |  |  |  |  | 85,149,000
Total liabilities assumed |  |  |  |  |  |  |  |  |  |  | 121,800,000
Merger-related expenses |  |  |  |  |  |  | 0 | 1,200,000 |  |  |
Gain on acquisitions |  |  |  |  |  |  | 12,000,000 |  |  |  |
Revenue of acquired business |  |  |  |  |  |  | $ 3,700,000 | $ 3,800,000 |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  | $ 850,000

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