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Parent Company Financial Information (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and due from banks | $ 260,180 | $ 244,615 |  |
Interest-earning deposits | 17,407 | 97,918 |  |
Total cash and cash equivalents | 277,587 | 342,533 | $ 224,238 | $ 175,302
Goodwill | 765,842 | 765,842 | 382,762 | 382,762
Other assets | 280,250 | 284,621 |  |
Total Assets | 13,095,145 | 12,716,886 |  |
Subordinated Debt | 35,462 | 35,647 |  |
Junior Subordinated Notes | 0 | 8,248 |  |
Liabilities and Shareholders’ Equity |  |  |  |
Other liabilities | 107,291 | 100,346 |  |
Total liabilities | 11,061,496 | 10,766,964 |  |
Shareholders’ equity | 2,033,649 | 1,949,922 | 1,251,012 | 1,242,128
Total liabilities and shareholders' equity | 13,095,145 | 12,716,886 |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash and due from banks | 945 | 533 |  |
Interest-earning deposits | 7,226 | 8,765 |  |
Total cash and cash equivalents | 8,171 | 9,298 | $ 2,447 | $ 3,989
Goodwill | 4,729 | 4,729 |  |
Other assets | 1,595 | 3,426 |  |
Total Assets | 2,069,662 | 1,994,398 |  |
Subordinated Debt | 35,462 | 35,647 |  |
Junior Subordinated Notes | 0 | 8,248 |  |
Liabilities and Shareholders’ Equity |  |  |  |
Other liabilities | 551 | 581 |  |
Total liabilities | 36,013 | 44,476 |  |
Shareholders’ equity | 2,033,649 | 1,949,922 |  |
Total liabilities and shareholders' equity | 2,069,662 | 1,994,398 |  |
Banking Subsidiaries [Member] | Parent Company [Member] |  |  |  |
Assets |  |  |  |
Investment in subsidiaries | 2,049,855 | 1,971,788 |  |
Other Subsidiaries [Member] | Parent Company [Member] |  |  |  |
Assets |  |  |  |
Investment in subsidiaries | $ 5,312 | $ 5,157 |  |

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