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Parent Company Financial Statements, Condensed Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets [Abstract] |  |
Cash on deposit | $ 64,632 | $ 47,528
Goodwill | 65,490 | 65,490
Premises and equipment, net | 45,291 | 46,318
Other assets | 57,150 | 41,459
Total assets | 4,201,616 | 4,136,231
Liabilities and shareholders' equity [Abstract] |  |
Long-term debt | 59,341 | 59,341
Other liabilities | 34,484 | 25,923
Total liabilities | 3,637,466 | 3,605,532
Shareholders' equity | 564,150 | 530,699
Total liabilities and shareholders' equity | 4,201,616 | 4,136,231
Parent Company [Member] |  |
Assets [Abstract] |  |
Cash on deposit | 1,939 | 1,500
Investment in and advances to subsidiaries | 620,701 | 587,575
Goodwill | 4,973 | 4,973
Premises and equipment, net | 219 | 250
Other assets | 238 | 200
Total assets | 628,070 | 594,498
Liabilities and shareholders' equity [Abstract] |  |
Long-term debt | 61,341 | 61,341
Other liabilities | 2,579 | 2,458
Total liabilities | 63,920 | 63,799
Shareholders' equity | 564,150 | 530,699
Total liabilities and shareholders' equity | $ 628,070 | $ 594,498

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