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Investment Securities (Schedule of Fair Value and Unrealized Loss on Investments in a Continuous Unrealized Loss Position) (Details) $ in Thousands | Jun. 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 | 33 | 18
Available-for-sale securities, Less than 12 Months: Fair Value | $ 36,021 | $ 16,419
Available-for-sale securities, Less than 12 Months: Unrealized Losses | $ 994 | $ 361
Available-for-sale securities, 12 Months or More: Number of Securities | security | 75 | 74
Available-for-sale securities, 12 Months or More: Fair Value | $ 71,289 | $ 73,816
Available-for-sale securities, 12 Months or More: Unrealized Losses | $ 4,531 | $ 2,386
Available-for-sale securities, Total: Number of Securities | security | 108 | 92
Available-for-sale securities, Total: Fair Value | $ 107,310 | $ 90,235
Available-for-sale securities, Total: Unrealized Losses | $ 5,525 | $ 2,747
Held-to-maturity securities, Less than 12 Months: Number of Securities | security | 174 | 0
Held-to-maturity securities, Less than 12 Months: Fair Value | $ 116,431 |
Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 2,976 |
Held-to-maturity securities, 12 Months or More: Number of Securities | security | 11 | 116
Held-to-maturity securities, 12 Months or More: Fair Value | $ 12,302 | $ 93,819
Held-to-maturity securities, 12 Months or More: Unrealized Losses | $ 390 | $ 914
Held-to-maturity securities, Total: Number of Securities | security | 185 | 116
Held-to-maturity securities, Total: Fair Value | $ 128,733 | $ 93,819
Held-to-maturity securities, Total: Unrealized Losses | $ 3,366 | $ 914
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Number of Securities | security | 207 | 18
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Fair Value | $ 152,452 | $ 16,419
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 3,970 | $ 361
Available-for-sale securities and Held-to-maturity securities,, 12 Months or More: Number of Securities | security | 86 | 190
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Fair Value | $ 83,591 | $ 167,635
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Unrealized Losses | $ 4,921 | $ 3,300
Available-for-sale securities and Held-to-maturity securities, Total: Number of Securities | security | 293 | 208
Available-for-sale securities and Held-to-maturity securities, Total: Fair Value | $ 236,043 | $ 184,054
Available-for-sale securities and Held-to-maturity securities, Total: Unrealized Losses | $ 8,891 | $ 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 | 3 | 3
Available-for-sale securities, Less than 12 Months: Fair Value | $ 4,453 | $ 5,008
Available-for-sale securities, Less than 12 Months: Unrealized Losses | $ 231 | $ 184
Available-for-sale securities, 12 Months or More: Number of Securities | security | 19 | 18
Available-for-sale securities, 12 Months or More: Fair Value | $ 33,887 | $ 33,722
Available-for-sale securities, 12 Months or More: Unrealized Losses | $ 2,026 | $ 1,211
Available-for-sale securities, Total: Number of Securities | security | 22 | 21
Available-for-sale securities, Total: Fair Value | $ 38,340 | $ 38,730
Available-for-sale securities, Total: Unrealized Losses | $ 2,257 | $ 1,395
Held-to-maturity securities, Less than 12 Months: Number of Securities | security | 3 | 0
Held-to-maturity securities, Less than 12 Months: Fair Value | $ 8,793 |
Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 191 |
Held-to-maturity securities, 12 Months or More: Number of Securities | security | 1 | 4
Held-to-maturity securities, 12 Months or More: Fair Value | $ 1,991 | $ 10,894
Held-to-maturity securities, 12 Months or More: Unrealized Losses | $ 10 | $ 90
Held-to-maturity securities, Total: Number of Securities | security | 4 | 4
Held-to-maturity securities, Total: Fair Value | $ 10,784 | $ 10,894
Held-to-maturity securities, Total: Unrealized Losses | $ 201 | $ 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 | 15 | 4
Available-for-sale securities, Less than 12 Months: Fair Value | $ 23,474 | $ 5,267
Available-for-sale securities, Less than 12 Months: Unrealized Losses | $ 407 | $ 75
Available-for-sale securities, 12 Months or More: Number of Securities | security | 15 | 15
Available-for-sale securities, 12 Months or More: Fair Value | $ 18,916 | $ 20,497
Available-for-sale securities, 12 Months or More: Unrealized Losses | $ 881 | $ 494
Available-for-sale securities, Total: Number of Securities | security | 30 | 19
Available-for-sale securities, Total: Fair Value | $ 42,390 | $ 25,764
Available-for-sale securities, Total: Unrealized Losses | $ 1,288 | $ 569
Held-to-maturity securities, Less than 12 Months: Number of Securities | security | 37 | 0
Held-to-maturity securities, Less than 12 Months: Fair Value | $ 54,276 |
Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 1,324 |
Held-to-maturity securities, 12 Months or More: Number of Securities | security | 7 | 35
Held-to-maturity securities, 12 Months or More: Fair Value | $ 8,825 | $ 52,949
Held-to-maturity securities, 12 Months or More: Unrealized Losses | $ 325 | $ 523
Held-to-maturity securities, Total: Number of Securities | security | 44 | 35
Held-to-maturity securities, Total: Fair Value | $ 63,101 | $ 52,949
Held-to-maturity securities, Total: Unrealized Losses | $ 1,649 | $ 523
State and political subdivision obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, Less than 12 Months: Number of Securities | security | 15 | 11
Available-for-sale securities, Less than 12 Months: Fair Value | $ 8,094 | $ 6,144
Available-for-sale securities, Less than 12 Months: Unrealized Losses | $ 356 | $ 102
Available-for-sale securities, 12 Months or More: Number of Securities | security | 41 | 40
Available-for-sale securities, 12 Months or More: Fair Value | $ 18,486 | $ 19,091
Available-for-sale securities, 12 Months or More: Unrealized Losses | $ 1,624 | $ 637
Available-for-sale securities, Total: Number of Securities | security | 56 | 51
Available-for-sale securities, Total: Fair Value | $ 26,580 | $ 25,235
Available-for-sale securities, Total: Unrealized Losses | $ 1,980 | $ 739
Held-to-maturity securities, Less than 12 Months: Number of Securities | security | 134 | 0
Held-to-maturity securities, Less than 12 Months: Fair Value | $ 53,362 |
Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 1,461 |
Held-to-maturity securities, 12 Months or More: Number of Securities | security | 3 | 77
Held-to-maturity securities, 12 Months or More: Fair Value | $ 1,486 | $ 29,976
Held-to-maturity securities, 12 Months or More: Unrealized Losses | $ 55 | $ 301
Held-to-maturity securities, Total: Number of Securities | security | 137 | 77
Held-to-maturity securities, Total: Fair Value | $ 54,848 | $ 29,976
Held-to-maturity securities, Total: Unrealized Losses | $ 1,516 | $ 301
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, Less than 12 Months: Number of Securities | security |  | 0
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

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