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Parent Only Financial Information Parent Only Income Statement (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and Dividends on Investments | $ 96,503 | $ 84,657 | $ 76,915
Other Operating Income | 1,324 | 927 | 1,113
Interest Expense | 12,485 | 7,006 | 5,356
Other Operating Expense | 15,599 | 14,577 | 14,494
Provision for Income Taxes | 9,026 | 10,529 | 11,215
Net Income | 36,279 | 29,326 | 26,534
Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividends from Bank Subsidiaries | 13,300 | 12,800 | 11,650
Interest and Dividends on Investments | 48 | 53 | 117
Other Operating Income | 907 | 677 | 635
Total Income | 14,255 | 13,530 | 12,402
Interest Expense | 976 | 781 | 691
Other Operating Expense | 1,175 | 958 | 942
Total Expense | 2,151 | 1,739 | 1,633
Income Before Income Tax Benefit and Equity in Undistributed Net Income of Subsidiaries | 12,104 | 11,791 | 10,769
Provision for Income Taxes | 686 | 225 | 482
Equity in Undistributed Net Income of Subsidiaries | 23,489 | 17,310 | 15,283
Net Income | $ 36,279 | $ 29,326 | $ 26,534

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