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Acquisitions (Narrative) (Details) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 28, 2017 USD ($) entity | Mar. 10, 2017 USD ($) entity | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Apr. 29, 2017 entity
Business Acquisition [Line Items] |  |  |  |  |  |
Short-term borrowings |  |  | $ 1,703,890 | $ 1,225,406 |  |
Long-term borrowings |  |  | 305,513 | 436,280 |  |
Goodwill |  |  | 745,523 | 621,193 |  |
Revenue |  |  | 792,312 | 659,116 | $ 625,174 |
Professional Fees |  |  | 40,235 | 29,561 | 40,198 |
Other expense |  |  | 82,636 | 72,564 | 72,203 |
Loan expected to be uncollectible |  |  | 217,308 | 229,418 | $ 181,179 |
Unpaid principal balance |  |  | 341,713 | 327,722 |  |
Recorded investment with an allowance |  |  | 170,142 | 132,004 |  |
Recorded investment without an allowance |  |  | 147,055 | 169,341 |  |
Hancock Holding Company [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long-term borrowings |  |  | 234,135 | 251,573 |  |
Whitney Bank [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net of cash acquired |  | $ 323,000 |  |  |  |
Cash consideration |  | 326,000 |  |  |  |
Cash acquired |  | 3,000 |  |  |  |
Acquisition, Premium amount to pay |  | 41,600 |  |  |  |
FHLB Borrowings [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Short-term borrowings |  |  | 1,132,567 | $ 865,000 |  |
$450 Debt Due 2020 [Member] | Variable-rate Term Notes [Member] | FHLB Borrowings [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Short-term borrowings |  |  | $ 450,000 |  |  |
Maturity year |  |  | 2020 |  |  |
$200 Debt Due 2025 [Member] | Variable-rate Term Notes [Member] | FHLB Borrowings [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Short-term borrowings |  |  | $ 200,000 |  |  |
Maturity year |  |  | 2025 |  |  |
$260 Debt Due 2026 [Member] | Variable-rate Term Notes [Member] | FHLB Borrowings [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Short-term borrowings |  |  | $ 260,000 |  |  |
Maturity year |  |  | 2026 |  |  |
FNBC Transaction [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition, debt assumed |  |  | $ 93,120 |  |  |
Identifiable intangible assets |  |  | 25,300 |  |  |
Goodwill |  |  | 124,330 |  |  |
Fair value discount |  |  | 41,000 |  |  |
Acquisition, debt assumed |  |  | 4,686 |  |  |
Total Loans |  |  | 1,368,669 |  |  |
Unpaid principal balance of the loans acquired |  |  | 1,400,000 |  |  |
Liabilities assumed |  |  | 2,622,950 |  |  |
Estimated uncollectible amount |  |  | 31,700 |  |  |
Unpaid principal balance |  |  | 39,900 |  |  |
Recorded investment with an allowance |  |  | 15,000 |  |  |
Recorded investment without an allowance |  |  | $ 24,900 |  |  |
FNBC I [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition, debt assumed |  | 93,120 |  |  |  |
Identifiable intangible assets |  | 3,900 |  |  |  |
Goodwill |  | 103,547 |  |  |  |
Acquisition, debt assumed |  | 1,607 |  |  |  |
Total Loans |  | 1,203,092 |  |  |  |
Useful life |  |  | 8 years |  |  |
Liabilities assumed |  | $ 1,003,647 |  |  |  |
FNBC I [Member] | Whitney Bank [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of branches | entity |  | 9 |  |  |  |
FNBC I [Member] | FHLB Borrowings [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Liabilities assumed |  |  | $ 690,000 |  |  |
FNBC I [Member] | Variable-rate Term Notes [Member] | FHLB Borrowings [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Short-term borrowings |  |  | 460,000 |  |  |
FNBC I [Member] | Fixed-rate Term Notes [Member] | FHLB Borrowings [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long-term borrowings |  |  | 93,100 |  |  |
FNBC I [Member] | Fixed-rate Term Notes [Member] | FHLB Borrowings [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Short-term borrowings |  |  | $ 51,000 |  |  |
FNBC II [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets | $ 21,400 |  |  |  |  |
Goodwill | 20,783 |  |  |  |  |
Acquisition, debt assumed | 3,079 |  |  |  |  |
Total Loans | 165,577 |  |  |  |  |
Useful life |  |  | 11 years |  |  |
Liabilities assumed | $ 1,619,303 |  |  |  |  |
FNBC II [Member] | Whitney Bank [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of branches | entity | 29 |  |  |  |  |
Cash received | $ 800,000 |  |  |  |  |
Cash acquired | 158,000 |  |  |  |  |
Number of branches exercised | entity |  |  |  |  |  | 7
Premium payment | 35,000 |  |  |  |  |
Unpaid principal balance of the loans acquired, Net liabilities assumed | $ 642,000 |  |  |  |  |

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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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