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Investment Securities (Schedule of Fair Value and Unrealized Loss on Investments in a Continuous Unrealized Loss Position) (Details) $ in Thousands | Mar. 31, 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 | 30 | 18
Available-for-sale securities, Less than 12 Months: Fair Value | $ 33,101 | $ 16,419
Available-for-sale securities, Less than 12 Months: Unrealized Losses | $ 863 | $ 361
Available-for-sale securities, 12 Months or More: Number of Securities | security | 74 | 74
Available-for-sale securities, 12 Months or More: Fair Value | $ 71,228 | $ 73,816
Available-for-sale securities, 12 Months or More: Unrealized Losses | $ 4,237 | $ 2,386
Available-for-sale securities, Total: Number of Securities | security | 104 | 92
Available-for-sale securities, Total: Fair Value | $ 104,329 | $ 90,235
Available-for-sale securities, Total: Unrealized Losses | $ 5,100 | $ 2,747
Held-to-maturity securities, Less than 12 Months: Number of Securities | security | 143 | 0
Held-to-maturity securities, Less than 12 Months: Fair Value | $ 105,724 |
Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 2,937 |
Held-to-maturity securities, 12 Months or More: Number of Securities | security | 3 | 116
Held-to-maturity securities, 12 Months or More: Fair Value | $ 4,053 | $ 93,819
Held-to-maturity securities, 12 Months or More: Unrealized Losses | $ 59 | $ 914
Held-to-maturity securities, Total: Number of Securities | security | 146 | 116
Held-to-maturity securities, Total: Fair Value | $ 109,777 | $ 93,819
Held-to-maturity securities, Total: Unrealized Losses | $ 2,996 | $ 914
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Number of Securities | security | 173 | 18
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Fair Value | $ 138,825 | $ 16,419
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 3,800 | $ 361
Available-for-sale securities and Held-to-maturity securities,, 12 Months or More: Number of Securities | security | 77 | 190
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Fair Value | $ 75,281 | $ 167,635
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Unrealized Losses | $ 4,296 | $ 3,300
Available-for-sale securities and Held-to-maturity securities, Total: Number of Securities | security | 250 | 208
Available-for-sale securities and Held-to-maturity securities, Total: Fair Value | $ 214,106 | $ 184,054
Available-for-sale securities and Held-to-maturity securities, Total: Unrealized Losses | $ 8,096 | $ 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 | $ 4,925 | $ 5,008
Available-for-sale securities, Less than 12 Months: Unrealized Losses | $ 267 | $ 184
Available-for-sale securities, 12 Months or More: Number of Securities | security | 18 | 18
Available-for-sale securities, 12 Months or More: Fair Value | $ 33,110 | $ 33,722
Available-for-sale securities, 12 Months or More: Unrealized Losses | $ 1,815 | $ 1,211
Available-for-sale securities, Total: Number of Securities | security | 21 | 21
Available-for-sale securities, Total: Fair Value | $ 38,035 | $ 38,730
Available-for-sale securities, Total: Unrealized Losses | $ 2,082 | $ 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 | $ 8,822 |
Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 161 |
Held-to-maturity securities, 12 Months or More: Number of Securities | security | 1 | 4
Held-to-maturity securities, 12 Months or More: Fair Value | $ 1,988 | $ 10,894
Held-to-maturity securities, 12 Months or More: Unrealized Losses | $ 13 | $ 90
Held-to-maturity securities, Total: Number of Securities | security | 4 | 4
Held-to-maturity securities, Total: Fair Value | $ 10,810 | $ 10,894
Held-to-maturity securities, Total: Unrealized Losses | $ 174 | $ 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 | 13 | 4
Available-for-sale securities, Less than 12 Months: Fair Value | $ 20,127 | $ 5,267
Available-for-sale securities, Less than 12 Months: Unrealized Losses | $ 258 | $ 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 | $ 19,597 | $ 20,497
Available-for-sale securities, 12 Months or More: Unrealized Losses | $ 819 | $ 494
Available-for-sale securities, Total: Number of Securities | security | 28 | 19
Available-for-sale securities, Total: Fair Value | $ 39,724 | $ 25,764
Available-for-sale securities, Total: Unrealized Losses | $ 1,077 | $ 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 | $ 55,999 |
Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 1,299 |
Held-to-maturity securities, 12 Months or More: Number of Securities | security | 2 | 35
Held-to-maturity securities, 12 Months or More: Fair Value | $ 2,065 | $ 52,949
Held-to-maturity securities, 12 Months or More: Unrealized Losses | $ 46 | $ 523
Held-to-maturity securities, Total: Number of Securities | security | 39 | 35
Held-to-maturity securities, Total: Fair Value | $ 58,064 | $ 52,949
Held-to-maturity securities, Total: Unrealized Losses | $ 1,345 | $ 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 | $ 8,049 | $ 6,144
Available-for-sale securities, Less than 12 Months: Unrealized Losses | $ 338 | $ 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 | $ 18,521 | $ 19,091
Available-for-sale securities, 12 Months or More: Unrealized Losses | $ 1,603 | $ 637
Available-for-sale securities, Total: Number of Securities | security | 55 | 51
Available-for-sale securities, Total: Fair Value | $ 26,570 | $ 25,235
Available-for-sale securities, Total: Unrealized Losses | $ 1,941 | $ 739
Held-to-maturity securities, Less than 12 Months: Number of Securities | security | 103 | 0
Held-to-maturity securities, Less than 12 Months: Fair Value | $ 40,903 |
Held-to-maturity securities, Less than 12 Months: Unrealized Losses | $ 1,477 |
Held-to-maturity securities, 12 Months or More: Number of Securities | security | 0 | 77
Held-to-maturity securities, 12 Months or More: Fair Value |  | $ 29,976
Held-to-maturity securities, 12 Months or More: Unrealized Losses |  | $ 301
Held-to-maturity securities, Total: Number of Securities | security | 103 | 77
Held-to-maturity securities, Total: Fair Value | $ 40,903 | $ 29,976
Held-to-maturity securities, Total: Unrealized Losses | $ 1,477 | $ 301
Corporate debt 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 |  | 0
Available-for-sale securities, Total: Number of Securities | security |  | 0
Held-to-maturity securities, Less than 12 Months: Number of Securities | security |  | 0
Held-to-maturity securities, 12 Months or More: Number of Securities | security |  | 0
Held-to-maturity securities, Total: Number of Securities | security |  | 0
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
Held-to-maturity securities, Less than 12 Months: Number of Securities | security |  | 0
Held-to-maturity securities, 12 Months or More: Number of Securities | security |  | 0
Held-to-maturity securities, Total: Number of Securities | security |  | 0

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