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Parent Company Financial Statements, Condensed Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets [Abstract] |  |
Cash on deposit | $ 47,528 | $ 48,603
Goodwill | 65,490 | 65,490
Premises and equipment, net | 46,318 | 47,940
Other assets | 41,459 | 36,984
Total assets | 4,136,231 | 3,932,169
Liabilities and shareholders' equity [Abstract] |  |
Long-term debt | 59,341 | 61,341
Other liabilities | 25,923 | 24,244
Total liabilities | 3,605,532 | 3,431,554
Shareholders' equity | 530,699 | 500,615
Total liabilities and shareholders' equity | 4,136,231 | 3,932,169
Parent Company [Member] |  |
Assets [Abstract] |  |
Cash on deposit | 1,500 | 1,525
Investment in and advances to subsidiaries | 587,575 | 556,975
Goodwill | 4,973 | 4,973
Premises and equipment, net | 250 | 142
Other assets | 200 | 391
Total assets | 594,498 | 564,006
Liabilities and shareholders' equity [Abstract] |  |
Long-term debt | 61,341 | 61,341
Other liabilities | 2,458 | 2,050
Total liabilities | 63,799 | 63,391
Shareholders' equity | 530,699 | 500,615
Total liabilities and shareholders' equity | $ 594,498 | $ 564,006

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