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Acquisitions and Divestiture (Schedule of Fair Value of Net Assets Acquired Acquired and Liabilities Assumed - FNBC) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jul. 13, 2018 | Dec. 31, 2017 | Apr. 28, 2017 | Mar. 10, 2017 | Dec. 31, 2016
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Business Acquisition [Line Items] |  |  |  |  |  |
Total Loans |  | $ 10,400,000 |  |  |  |
Goodwill | $ 790,972 |  | $ 745,523 |  |  | $ 621,193
FNBC Transactions [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 |  |  | 1,368,669 |  |  |
Property and equipment |  |  | 20,934 |  |  |
Accrued interest receivable |  |  | 4,028 |  |  |
Identifiable intangible assets | $ 25,300 |  | 25,300 |  |  |
Deferred tax asset |  |  | 2,220 |  |  |
Other assets |  |  | 4,213 |  |  |
Total identifiable assets |  |  | 2,182,799 |  |  |
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) |  |  | (440,151) |  |  |
Consideration (Paid) Received |  |  | 315,821 |  |  |
Goodwill |  |  | $ 124,330 |  |  |
FNBC I [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash and due from banks |  |  |  |  | $ 2,856 |
Total Loans |  |  |  |  | 1,203,092 |
Property and equipment |  |  |  |  | 11,946 |
Accrued interest receivable |  |  |  |  | 3,143 |
Identifiable intangible assets |  |  |  |  | 3,900 |
Deferred tax asset |  |  |  |  | 856 |
Other assets |  |  |  |  | 63 |
Total identifiable assets |  |  |  |  | 1,225,856 |
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) |  |  |  |  | 222,209 |
Consideration (Paid) Received |  |  |  |  | (325,756) |
Goodwill |  |  |  |  | $ 103,547 |
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 |  |
Deferred tax asset |  |  |  | 1,364 |  |
Other assets |  |  |  | 4,150 |  |
Total identifiable assets |  |  |  | 956,943 |  |
Deposits |  |  |  | 1,530,338 |  |
Short-term borrowings |  |  |  | 85,886 |  |
Other liabilities |  |  |  | 3,079 |  |
Total liabilities |  |  |  | 1,619,303 |  |
Net identifiable assets acquired (liabilities assumed) |  |  |  | (662,360) |  |
Consideration (Paid) Received |  |  |  | 641,577 |  |
Goodwill |  |  |  | $ 20,783 |  |

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