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Acquisitions (Narrative) (Details) |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 28, 2017 USD ($) entity | Mar. 10, 2017 USD ($) entity | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Short-term borrowings |  |  | $ 1,810,907,000 |  | $ 1,810,907,000 |  | $ 1,225,406,000 |
Long-term borrowings |  |  | 407,876,000 |  | 407,876,000 |  | 436,280,000 |
Goodwill |  |  | 740,265,000 |  | 740,265,000 |  | 621,193,000 |
Revenue |  |  | 199,717,000 | $ 164,969,000 | 381,408,000 | $ 327,805,000 |  |
Professional Fees |  |  | 10,353,000 | 7,712,000 | 21,629,000 | 15,333,000 |  |
Other expense |  |  | 27,667,000 | 16,473,000 | 46,297,000 | 33,182,000 |  |
Loan expected to be uncollectible |  |  | 221,865,000 | $ 226,086,000 | 221,865,000 | $ 226,086,000 | $ 229,418,000 | $ 181,179,000
Whitney Bank [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of branches | entity |  | 9 |  |  |  |  |  |
Net of cash acquired |  | $ 323,000,000 |  |  |  |  |  |
Cash consideration |  | 326,000,000 |  |  |  |  |  |
Cash acquired |  | 3,000,000 |  |  |  |  |  |
Acquisition, Premium amount to pay |  | 41,600,000 |  |  |  |  |  |
FNBC Transaction [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition, debt assumed |  |  | 93,120,000 |  | 93,120,000 |  |  |
Identifiable intangible assets |  |  | 24,400,000 |  | 24,400,000 |  |  |
Goodwill |  |  | 119,072,000 |  | 119,072,000 |  |  |
Fair value discount |  |  |  |  | 57,500,000 |  |  |
Acquisition, debt assumed |  |  | 4,686,000 |  | 4,686,000 |  |  |
Total Loans |  |  | 1,377,100,000 |  | 1,377,100,000 |  |  |
Unpaid principal balance of the loans acquired |  |  | 1,400,000,000 |  | 1,400,000,000 |  |  |
Liabilities assumed |  |  | 2,622,950,000 |  | 2,622,950,000 |  |  |
Estimated uncollectible amount |  |  | 47,600,000 |  | $ 47,600,000 |  |  |
FNBC I [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition, debt assumed |  | 93,120,000 |  |  |  |  |  |
Identifiable intangible assets |  | 3,900,000 |  |  |  |  |  |
Goodwill |  | 96,063,000 |  |  |  |  |  |
Acquisition, debt assumed |  | 1,607,000 |  |  |  |  |  |
Goodwill adjustment |  |  | 495,000 |  |  |  |  |
Total Loans |  | 1,211,523,000 |  |  |  |  |  |
Useful life |  |  |  |  | 8 years |  |  |
Liabilities assumed |  | 1,003,647,000 |  |  |  |  |  |
FNBC I [Member] | FHLB Borrowings [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Liabilities assumed |  | $ 604,000,000 |  |  |  |  |  |
FNBC I [Member] | Variable-rate Term Notes [Member] | FHLB Borrowings [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Short-term borrowings |  |  | 460,000,000 |  | $ 460,000,000 |  |  |
FNBC I [Member] | Fixed-rate Term Notes [Member] | FHLB Borrowings [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Short-term borrowings |  |  | 51,000,000 |  | $ 51,000,000 |  |  |
Maturity year |  |  |  |  | 2017 |  |  |
Long-term borrowings |  |  | 93,100,000 |  | $ 93,100,000 |  |  |
FNBC I [Member] | $200 Debt Due 2025 [Member] | Variable-rate Term Notes [Member] | FHLB Borrowings [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Short-term borrowings |  |  | 200,000,000 |  | $ 200,000,000 |  |  |
Maturity year |  |  |  |  | 2025 |  |  |
FNBC I [Member] | $260 Debt Due 2026 [Member] | Variable-rate Term Notes [Member] | FHLB Borrowings [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Short-term borrowings |  |  | 260,000,000 |  | $ 260,000,000 |  |  |
Maturity year |  |  |  |  | 2026 |  |  |
FNBC I [Member] | $88 Debt Due 2018 [Member] | Fixed-rate Term Notes [Member] | FHLB Borrowings [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Maturity year |  |  |  |  | 2018 |  |  |
Long-term borrowings |  |  | 88,000,000 |  | $ 88,000,000 |  |  |
FNBC I [Member] | $3.2 Debt Due 2019 [Member] | Fixed-rate Term Notes [Member] | FHLB Borrowings [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Maturity year |  |  |  |  | 2019 |  |  |
Long-term borrowings |  |  | 3,200,000 |  | $ 3,200,000 |  |  |
FNBC I [Member] | $1.9 Debt Due 2023 [Member] | Fixed-rate Term Notes [Member] | FHLB Borrowings [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Maturity year |  |  |  |  | 2023 |  |  |
Long-term borrowings |  |  | $ 1,900,000 |  | $ 1,900,000 |  |  |
FNBC II [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Identifiable intangible assets | $ 20,500,000 |  |  |  |  |  |  |
Goodwill | 23,009,000 |  |  |  |  |  |  |
Acquisition, debt assumed | 3,079,000 |  |  |  |  |  |  |
Total Loans | 165,577,000 |  |  |  |  |  |  |
Useful life |  |  |  |  | 9 years |  |  |
Liabilities assumed | $ 1,619,303,000 |  |  |  |  |  |  |
FNBC II [Member] | Whitney Bank [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of branches | entity | 29 |  |  |  |  |  |  |
Cash received | $ 798,000,000 |  |  |  |  |  |  |
Cash acquired | 158,000,000 |  |  |  |  |  |  |
Premium payment | 35,000,000 |  |  |  |  |  |  |
Unpaid principal balance of the loans acquired | $ 640,000,000 |  |  |  |  |  |  |
FNBC II [Member] | Louisiana [Member] | Whitney Bank [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of branches | entity | 24 |  |  |  |  |  |  |
FNBC II [Member] | Florida [Member] | Whitney Bank [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of branches | entity | 5 |  |  |  |  |  |  |

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