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Parent Company Financial Statements, Condensed Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Cash on deposit | $ 54,250 | $ 58,680 |  |
Goodwill | 65,490 | 65,490 |  |
Premises and equipment, net | 42,001 | 44,046 |  |
Other assets | 35,887 | 37,731 |  |
Total assets | 5,139,141 | 4,366,003 |  |
Liabilities and shareholders' equity [Abstract] |  |  |  |
Long-term debt | 57,841 | 57,841 |  |
Other liabilities | 33,694 | 29,332 |  |
Total liabilities | 4,484,276 | 3,751,117 |  |
Shareholders' equity | 654,865 | 614,886 | $ 564,150 | $ 530,699
Total liabilities and shareholders' equity | 5,139,141 | 4,366,003 |  |
Parent Company [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash on deposit | 1,505 | 2,089 |  |
Investment in and advances to subsidiaries | 707,943 | 667,206 |  |
Goodwill | 4,973 | 4,973 |  |
Premises and equipment, net | 96 | 153 |  |
Deferred tax asset | 4,649 | 5,100 |  |
Other assets | 45 | 44 |  |
Total assets | 719,211 | 679,565 |  |
Liabilities and shareholders' equity [Abstract] |  |  |  |
Long-term debt | 61,341 | 61,341 |  |
Other liabilities | 3,005 | 3,338 |  |
Total liabilities | 64,346 | 64,679 |  |
Shareholders' equity | 654,865 | 614,886 |  |
Total liabilities and shareholders' equity | $ 719,211 | $ 679,565 |  |

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