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Acquisitions (Schedule of Fair Value of Net Assets Acquired) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Apr. 28, 2017 | Mar. 10, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 739,403 |  |  | $ 621,193
FNBC Transaction [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and due from banks | 160,788 |  |  |
Interest-bearing time deposits with other banks | 382,622 |  |  |
Fed funds sold and other short-term investments | 148 |  |  |
Securities | 213,877 |  |  |
Total Loans | 1,377,100 |  |  |
Property and equipment | 20,825 |  |  |
Accrued interest receivable | 3,854 |  |  |
Identifiable intangible assets | 25,300 |  |  |
Other assets | 4,213 |  |  |
Total identifiable assets | 2,188,727 |  |  |
Deposits | 1,928,509 |  |  |
Short-term borrowings | 596,635 |  |  |
Long-term debt | 93,120 |  |  |
Other liabilities | 4,686 |  |  |
Total liabilities | 2,622,950 |  |  |
Net identifiable assets acquired (liabilities assumed) | (434,223) |  |  |
Consideration (Paid) Received | 316,013 |  |  |
Goodwill | $ 118,210 |  |  |
FNBC I [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and due from banks |  |  | $ 2,856 |
Total Loans |  |  | 1,211,523 |
Property and equipment |  |  | 11,837 |
Accrued interest receivable |  |  | 2,969 |
Identifiable intangible assets |  |  | 3,900 |
Other assets |  |  | 63 |
Total identifiable assets |  |  | 1,233,148 |
Deposits |  |  | 398,171 |
Short-term borrowings |  |  | 510,749 |
Long-term debt |  |  | 93,120 |
Other liabilities |  |  | 1,607 |
Total liabilities |  |  | 1,003,647 |
Net identifiable assets acquired (liabilities assumed) |  |  | 229,501 |
Consideration (Paid) Received |  |  | (325,564) |
Goodwill |  |  | $ 96,063 |
FNBC II [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and due from banks |  | $ 157,932 |  |
Interest-bearing time deposits with other banks |  | 382,622 |  |
Fed funds sold and other short-term investments |  | 148 |  |
Securities |  | 213,877 |  |
Total Loans |  | 165,577 |  |
Property and equipment |  | 8,988 |  |
Accrued interest receivable |  | 885 |  |
Identifiable intangible assets |  | 21,400 |  |
Other assets |  | 4,150 |  |
Total identifiable assets |  | 955,579 |  |
Deposits |  | 1,530,338 |  |
Short-term borrowings |  | 85,886 |  |
Other liabilities |  | 3,079 |  |
Total liabilities |  | 1,619,303 |  |
Net identifiable assets acquired (liabilities assumed) |  | (663,724) |  |
Consideration (Paid) Received |  | 641,577 |  |
Goodwill |  | $ 22,147 |  |

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