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Business Combinations (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2018 | Oct. 02, 2018 | May 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 31, 2018 | Dec. 31, 2017 | Jan. 13, 2017 | Mar. 11, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Gross Realized Losses |  |  |  |  | $ 0 |  | $ 29 |  |  |  |
Available-for-sale Securities, Gross Realized Gains |  |  |  |  | 1,337 |  | 4,693 |  |  |  |
Purchase price |  |  |  |  |  | $ 112,657 |  |  |  |  |
Assets |  |  |  | $ 34,954,659 |  | 34,954,659 |  |  | $ 34,527,512 |  |
Loans and leases |  |  |  | 24,886,347 |  | 24,886,347 |  |  | 23,596,825 |  |
Deposits |  |  |  | 30,163,537 |  | 30,163,537 |  |  | 29,266,275 |  |
PCI loans and leases |  |  |  |  |  |  |  |  |  | $ 15,555 | $ 199,682
Gain on acquisitions |  |  |  | 0 | 0 | 0 | 134,745 |  |  |  |
Merger-related expenses |  |  |  | 1,126 | $ 562 | 4,136 | $ 8,248 |  |  |  |
Revenue generated |  |  |  | 6,800 |  | 11,800 |  |  |  |  |
Goodwill |  |  |  | 208,217 |  | 208,217 |  |  | $ 150,601 |  |
Capital Commerce Bancorp |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  | 222,300 |  | 222,300 |  |  |  |  |
Loans and leases |  |  |  | 189,600 |  | 189,600 |  |  |  |  |
Deposits |  |  |  | 171,900 |  | 171,900 |  |  |  |  |
Palmetto Heritage Bancshares |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  | 164,900 |  | 164,900 |  |  |  |  |
Loans and leases |  |  |  | 136,400 |  | 136,400 |  |  |  |  |
Deposits |  |  |  | 123,100 |  | 123,100 |  |  |  |  |
HomeBancorp Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Share Price |  |  | $ 15.03 |  |  |  |  |  |  |  |
Purchase price |  |  | $ 112,700 |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 6,359 |  |  |  |  |  |  |  |
Overnight investments |  |  | 10,393 |  |  |  |  |  |  |  |
Investment securities available for sale |  |  | 200,918 |  |  |  |  |  |  |  |
Loans held for sale |  |  | 791 |  |  |  |  |  |  |  |
Loans |  |  | 566,173 |  |  |  |  |  |  |  |
PCI loans and leases |  |  | 15,555 |  |  |  |  |  |  |  |
Core deposit intangible |  |  | 9,900 |  |  |  |  |  |  |  |
Non-PCI Loans |  |  | 550,618 |  |  |  |  |  |  |  |
Premises and equipment |  |  | 6,542 |  |  |  |  |  |  |  |
Other real estate owned |  |  | 2,135 |  |  |  |  |  |  |  |
Income earned not collected |  |  | 2,717 |  |  |  |  |  |  |  |
Intangible asset |  |  | 13,206 |  |  |  |  |  |  |  |
Other assets |  |  | 33,459 |  |  |  |  |  |  |  |
Total assets acquired |  |  | 842,693 |  |  |  |  |  |  |  |
Deposits |  |  | 619,589 |  |  |  |  |  |  |  |
Short-term borrowings |  |  | 108,973 |  |  |  |  |  |  |  |
Accrued interest payable |  |  | 1,020 |  |  |  |  |  |  |  |
Long-term obligations |  |  | 52,944 |  |  |  |  |  |  |  |
Other liabilities |  |  | 5,126 |  |  |  |  |  |  |  |
Total liabilities assumed |  |  | 787,652 |  |  |  |  |  |  |  |
Fair value of net assets (liabilities) assumed |  |  | $ 55,041 |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  | 57,616 |  |  |  |  |
Merger-related expenses |  |  |  | $ 200 |  | $ 1,900 |  |  |  |  |
Subsequent Event | Capital Commerce Bancorp |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Share Price |  | $ 4.75 |  |  |  |  |  |  |  |  |
Purchase price |  | $ 28,100 |  |  |  |  |  |  |  |  |
Subsequent Event | Palmetto Heritage Bancshares |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Share Price |  |  |  |  |  |  |  | $ 135.00 |  |  |
Purchase price | $ 30,400 |  |  |  |  |  |  |  |  |  |

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