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Acquisition (Narrative) (Detail) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 10, 2017 USD ($) entity | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |
Acquisition, debt assumed | $ 93,120 |  |  |
Short-term borrowings |  | $ 2,121,932 |  | $ 1,225,406
Long-term borrowings |  | 525,082 |  | 436,280
Identifiable intangible assets | 3,900 |  |  |
Goodwill | 95,568 | 716,761 |  | $ 621,193
Revenue |  | 181,691 | $ 162,836 |
Merger-related charges |  | 6,500 |  |
Professional Fees |  | 11,276 | 7,621 |
Other expense |  | 18,630 | $ 16,709 |
Fair value discount |  | 52,700 |  |
Acquisition, debt assumed | $ 1,607 |  |  |
Whitney Bank [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches | entity | 9 |  |  |
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] |  |  |  |
Acquisition, debt assumed | $ 604,000 |  |  |
Variable-rate Term Notes [Member] | FHLB Borrowings [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Short-term borrowings |  | 460,000 |  |
Fixed-rate Term Notes [Member] | FHLB Borrowings [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Short-term borrowings |  | $ 51,000 |  |
Maturity year |  | 2017 |  |
Long-term borrowings |  | $ 93,100 |  |
FNBC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  | 5,100 |  |
Estimated net income |  | 2,900 |  |
Professional Fees |  | 4,600 |  |
Other expense |  | 1,500 |  |
$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 |  |
$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 |  |
$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 |  |
$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 |  |

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