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Parent Only Financial Information Parent Only Statement of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash Flows from Operating Activities: |  |  |
Net Income | $ 29,326 | $ 26,534 | $ 24,662
Stock-Based Compensation Expense | 351 | 287 | 308
Stock-Based Compensation Expense | 351 | 287 | 308
Net Cash Provided By Operating Activities | 37,827 | 34,695 | 28,926
Cash Flows from Investing Activities: |  |  |
Proceeds from the Sale of Securities Available-for-Sale | 107,175 | 97,930 | 66,551
Purchases of Securities Available-for-Sale | (117,262) | (134,950) | (201,820)
Proceeds from the Maturities and Calls of Securities Held-to-Maturity | 49,244 | 56,461 | 48,409
Net Cash Used In Investing Activities | (148,566) | (157,789) | (229,539)
Cash Flows from Financing Activities: |  |  |
Shares Issued for Stock Option Exercises, net | 1,190 | 2,404 | 918
Shares Issued for Dividend Reinvestment Plans | 1,684 | 1,743 | 886
Tax Benefit for Exercises of Stock Options | 0 | 188 | 59
Purchase of Treasury Stock | (3,248) | (2,141) | (1,498)
Cash Dividends Paid | (13,599) | (13,092) | (12,700)
Net Cash Provided By Financing Activities | 126,222 | 129,381 | 205,386
Net Increase (Decrease) in Cash and Cash Equivalents | 15,483 | 6,287 | 4,773
Cash and Cash Equivalents at Beginning of Year | 57,355 | 51,068 | 46,295
Cash and Cash Equivalents at End of Year | 72,838 | 57,355 | 51,068
Interest on Deposits and Borrowings | 6,957 | 5,341 | 4,856
Parent Company [Member] |  |  |
Cash Flows from Operating Activities: |  |  |
Net Income | 29,326 | 26,534 | 24,662
Undistributed Net Income of Subsidiaries | (17,310) | (15,283) | (11,509)
Stock-Based Compensation Expense | 233 | 196 | 227
Stock-Based Compensation Expense | 351 | 287 | 308
Changes in Other Assets and Other Liabilities | (1,530) | (1,177) | (1,419)
Net Cash Provided By Operating Activities | 11,070 | 10,557 | 12,269
Cash Flows from Investing Activities: |  |  |
Proceeds from the Sale of Securities Available-for-Sale | 0 | 0 | 47
Purchases of Securities Available-for-Sale | 0 | 0 | (47)
Proceeds from the Maturities and Calls of Securities Held-to-Maturity | 1,000 | 0 | 0
Net Cash Used In Investing Activities | 1,000 | 0 | 0
Cash Flows from Financing Activities: |  |  |
Shares Issued for Stock Option Exercises, net | 1,190 | 2,404 | 918
Shares Issued Under the Employee Stock Purchase Plan | 496 | 493 | 494
Shares Issued for Dividend Reinvestment Plans | 1,684 | 1,743 | 886
Tax Benefit for Exercises of Stock Options | 0 | 188 | 59
Purchase of Treasury Stock | (3,248) | (2,141) | (1,498)
Cash Dividends Paid | (13,599) | (13,092) | (12,700)
Net Cash Provided By Financing Activities | (13,477) | (10,405) | (11,841)
Net Increase (Decrease) in Cash and Cash Equivalents | (1,407) | 152 | 428
Cash and Cash Equivalents at Beginning of Year | 3,593 | 3,441 | 3,013
Cash and Cash Equivalents at End of Year | 2,186 | 3,593 | 3,441
Interest on Deposits and Borrowings | $ 781 | $ 691 | $ 619

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