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Investment Securities (Schedule of Fair Value and Unrealized Loss on Investments in a Continuous Unrealized Loss Position) (Details) $ in Thousands | Sep. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
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Schedule of Investments [Line Items] |  |
Available-for-sale securities, Less than 12 Months: Number of Securities | security | 28 | 18
Available-for-sale securities, Less than 12 Months: Fair Value | $ 27,006 | $ 16,419
Available-for-sale securities, Less than 12 Months: Unrealized Losses | $ 656 | $ 361
Available-for-sale securities, 12 Months or More: Number of Securities | security | 84 | 74
Available-for-sale securities, 12 Months or More: Fair Value | $ 79,526 | $ 73,816
Available-for-sale securities, 12 Months or More: Unrealized Losses | $ 5,694 | $ 2,386
Available-for-sale securities, Total: Number of Securities | security | 112 | 92
Available-for-sale securities, Total: Fair Value | $ 106,532 | $ 90,235
Available-for-sale securities, Total: Unrealized Losses | $ 6,350 | $ 2,747
Held-to-maturity securities, Less than 12 Months: Number of Securities | security | 211 | 0
Held-to-maturity securities, Less than 12 Months: Fair Value | $ 130,332 |
Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 3,226 |
Held-to-maturity securities, 12 Months or More: Number of Securities | security | 34 | 116
Held-to-maturity securities, 12 Months or More: Fair Value | $ 28,495 | $ 93,819
Held-to-maturity securities, 12 Months or More: Unrealized Losses | $ 1,201 | $ 914
Held-to-maturity securities, Total: Number of Securities | security | 245 | 116
Held-to-maturity securities, Total: Fair Value | $ 158,827 | $ 93,819
Held-to-maturity securities, Total: Unrealized Losses | $ 4,427 | $ 914
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Number of Securities | security | 239 | 18
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Fair Value | $ 157,338 | $ 16,419
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 3,882 | $ 361
Available-for-sale securities and Held-to-maturity securities,, 12 Months or More: Number of Securities | security | 118 | 190
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Fair Value | $ 108,021 | $ 167,635
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Unrealized Losses | $ 6,895 | $ 3,300
Available-for-sale securities and Held-to-maturity securities, Total: Number of Securities | security | 357 | 208
Available-for-sale securities and Held-to-maturity securities, Total: Fair Value | $ 265,359 | $ 184,054
Available-for-sale securities and Held-to-maturity securities, Total: Unrealized Losses | $ 10,777 | $ 3,661
U.S. Treasury and U.S. government agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, Less than 12 Months: Number of Securities | security | 1 | 3
Available-for-sale securities, Less than 12 Months: Fair Value | $ 484 | $ 5,008
Available-for-sale securities, Less than 12 Months: Unrealized Losses | $ 4 | $ 184
Available-for-sale securities, 12 Months or More: Number of Securities | security | 21 | 18
Available-for-sale securities, 12 Months or More: Fair Value | $ 37,466 | $ 33,722
Available-for-sale securities, 12 Months or More: Unrealized Losses | $ 2,636 | $ 1,211
Available-for-sale securities, Total: Number of Securities | security | 22 | 21
Available-for-sale securities, Total: Fair Value | $ 37,950 | $ 38,730
Available-for-sale securities, Total: Unrealized Losses | $ 2,640 | $ 1,395
Held-to-maturity securities, Less than 12 Months: Number of Securities | security | 4 |
Held-to-maturity securities, Less than 12 Months: Fair Value | $ 9,313 |
Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 206 |
Held-to-maturity securities, 12 Months or More: Number of Securities | security | 2 | 4
Held-to-maturity securities, 12 Months or More: Fair Value | $ 4,942 | $ 10,894
Held-to-maturity securities, 12 Months or More: Unrealized Losses | $ 55 | $ 90
Held-to-maturity securities, Total: Number of Securities | security | 6 | 4
Held-to-maturity securities, Total: Fair Value | $ 14,255 | $ 10,894
Held-to-maturity securities, Total: Unrealized Losses | $ 261 | $ 90
Mortgage-backed U.S. Government Agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, Less than 12 Months: Number of Securities | security | 12 | 4
Available-for-sale securities, Less than 12 Months: Fair Value | $ 18,385 | $ 5,267
Available-for-sale securities, Less than 12 Months: Unrealized Losses | $ 360 | $ 75
Available-for-sale securities, 12 Months or More: Number of Securities | security | 18 | 15
Available-for-sale securities, 12 Months or More: Fair Value | $ 21,777 | $ 20,497
Available-for-sale securities, 12 Months or More: Unrealized Losses | $ 1,130 | $ 494
Available-for-sale securities, Total: Number of Securities | security | 30 | 19
Available-for-sale securities, Total: Fair Value | $ 40,162 | $ 25,764
Available-for-sale securities, Total: Unrealized Losses | $ 1,490 | $ 569
Held-to-maturity securities, Less than 12 Months: Number of Securities | security | 35 |
Held-to-maturity securities, Less than 12 Months: Fair Value | $ 49,974 |
Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 1,279 |
Held-to-maturity securities, 12 Months or More: Number of Securities | security | 12 | 35
Held-to-maturity securities, 12 Months or More: Fair Value | $ 16,406 | $ 52,949
Held-to-maturity securities, 12 Months or More: Unrealized Losses | $ 719 | $ 523
Held-to-maturity securities, Total: Number of Securities | security | 47 | 35
Held-to-maturity securities, Total: Fair Value | $ 66,380 | $ 52,949
Held-to-maturity securities, Total: Unrealized Losses | $ 1,998 | $ 523
State and political subdivision obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, Less than 12 Months: Number of Securities | security | 14 | 11
Available-for-sale securities, Less than 12 Months: Fair Value | $ 7,144 | $ 6,144
Available-for-sale securities, Less than 12 Months: Unrealized Losses | $ 285 | $ 102
Available-for-sale securities, 12 Months or More: Number of Securities | security | 45 | 40
Available-for-sale securities, 12 Months or More: Fair Value | $ 20,283 | $ 19,091
Available-for-sale securities, 12 Months or More: Unrealized Losses | $ 1,928 | $ 637
Available-for-sale securities, Total: Number of Securities | security | 59 | 51
Available-for-sale securities, Total: Fair Value | $ 27,427 | $ 25,235
Available-for-sale securities, Total: Unrealized Losses | $ 2,213 | $ 739
Held-to-maturity securities, Less than 12 Months: Number of Securities | security | 171 |
Held-to-maturity securities, Less than 12 Months: Fair Value | $ 69,513 |
Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 1,730 |
Held-to-maturity securities, 12 Months or More: Number of Securities | security | 20 | 77
Held-to-maturity securities, 12 Months or More: Fair Value | $ 7,147 | $ 29,976
Held-to-maturity securities, 12 Months or More: Unrealized Losses | $ 427 | $ 301
Held-to-maturity securities, Total: Number of Securities | security | 191 | 77
Held-to-maturity securities, Total: Fair Value | $ 76,660 | $ 29,976
Held-to-maturity securities, Total: Unrealized Losses | $ 2,157 | $ 301
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, 12 Months or More: Number of Securities | security |  | 1
Available-for-sale securities, 12 Months or More: Fair Value |  | $ 506
Available-for-sale securities, 12 Months or More: Unrealized Losses |  | $ 44
Available-for-sale securities, Total: Number of Securities | security |  | 1
Available-for-sale securities, Total: Fair Value |  | $ 506
Available-for-sale securities, Total: Unrealized Losses |  | $ 44
Corporate debt securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, Less than 12 Months: Number of Securities | security | 1 |
Available-for-sale securities, Less than 12 Months: Fair Value | $ 993 |
Available-for-sale securities, Less than 12 Months: Unrealized Losses | $ 7 |
Available-for-sale securities, Total: Number of Securities | security | 1 |
Available-for-sale securities, Total: Fair Value | $ 993 |
Available-for-sale securities, Total: Unrealized Losses | $ 7 |
Held-to-maturity securities, Less than 12 Months: Number of Securities | security | 1 |
Held-to-maturity securities, Less than 12 Months: Fair Value | $ 1,532 |
Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 11 |
Held-to-maturity securities, Total: Number of Securities | security | 1 |
Held-to-maturity securities, Total: Fair Value | $ 1,532 |
Held-to-maturity securities, Total: Unrealized Losses | $ 11 |

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