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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and Dividends on Investments | $ 84,657 | $ 76,915 | $ 70,738
Other Operating Income | 927 | 1,113 | 1,354
Interest Expense | 7,006 | 5,356 | 4,813
Salaries and Employee Benefits | 37,166 | 34,330 | 33,064
Other Operating Expense | 15,088 | 14,801 | 13,913
Provision for Income Taxes | 10,529 | 11,215 | 10,610
Net Income | 29,326 | 26,534 | 24,662
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividends from Bank Subsidiaries | 12,800 | 11,650 | 13,400
Interest and Dividends on Investments | 53 | 117 | 118
Other Operating Income | 677 | 635 | 847
Total Income | 13,530 | 12,402 | 14,365
Interest Expense | 781 | 691 | 619
Salaries and Employee Benefits | 76 | 77 | 80
Other Operating Expense | 882 | 865 | 885
Total Expense | 1,739 | 1,633 | 1,584
Income Before Income Tax Benefit and Equity in Undistributed Net Income of Subsidiaries | 11,791 | 10,769 | 12,781
Provision for Income Taxes | 225 | 482 | 372
Equity in Undistributed Net Income of Subsidiaries | 17,310 | 15,283 | 11,509
Net Income | $ 29,326 | $ 26,534 | $ 24,662

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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition This element represents the undistributed income (or loss) of equity method investments, net of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations; such investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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