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Securities (Schedule of Investments' Gross Unrealized Losses and Fair Value Aggregated by Security Type and Length of Time that Individual Securities have been in a Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
12 Months or More, Fair Value |  | $ 1,998
12 Months or More, Unrealized Losses |  | (3)
Total, Fair Value |  | 1,998
Total, Unrealized Losses |  | (3)
States and Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | $ 19,140 | 17,310
Less than 12 Months, Unrealized Losses | (390) | (228)
12 Months or More, Fair Value | 56,740 | 44,948
12 Months or More, Unrealized Losses | (1,600) | (829)
Total, Fair Value | 75,880 | 62,258
Total, Unrealized Losses | (1,990) | (1,057)
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 2,045 |
Less than 12 Months, Unrealized Losses | (21) |
12 Months or More, Fair Value | 6,595 | 6,859
12 Months or More, Unrealized Losses | (235) | (95)
Total, Fair Value | 8,640 | 6,859
Total, Unrealized Losses | (256) | (95)
Mortgage-backed Securities-Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 8,444 | 22,250
Less than 12 Months, Unrealized Losses | (22) | (320)
12 Months or More, Fair Value | 122,950 | 125,846
12 Months or More, Unrealized Losses | (5,176) | (3,942)
Total, Fair Value | 131,394 | 148,096
Total, Unrealized Losses | (5,198) | (4,262)
Total Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 29,629 | 39,560
Less than 12 Months, Unrealized Losses | (433) | (548)
12 Months or More, Fair Value | 186,285 | 179,651
12 Months or More, Unrealized Losses | (7,011) | (4,869)
Total, Fair Value | 215,914 | 219,211
Total, Unrealized Losses | $ (7,444) | $ (5,417)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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