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Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Estimated Fair Value | $ 152,113 |  | $ 155,701
Held-to-maturity securities, Amortized Cost | 5,899 |  | 6,043
Held-to-maturity securities, Gross Unrealized Gains | 10 |  | 14
Held-to-maturity securities, Gross Unrealized Losses | 44 |  | 57
Held-to-maturity securities, Estimated Fair Value | 5,865 |  | 6,000
Equity securities, at fair value | 1,299 |  | 1,269
Accounting Standards Update 2016-01 |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cumulative effect adjustment (ASU 2016-01) | 1,300 |  |
Fair value adjustment recorded through earnings | 22 | $ 19 |
Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Amortized Cost | 152,846 |  | 158,447
Available-for-sale securities, Gross Unrealized Gains | 106 |  | 117
Available-for-sale securities, Gross Unrealized Losses | 2,138 |  | 4,132
Available-for-sale securities, Estimated Fair Value | 150,814 |  | 154,432
U.S. Government Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Amortized Cost | 34,194 |  | 34,285
Available-for-sale securities, Gross Unrealized Gains | 3 |  | 2
Available-for-sale securities, Gross Unrealized Losses | 386 |  | 651
Available-for-sale securities, Estimated Fair Value | 33,811 |  | 33,636
Held-to-maturity securities, Amortized Cost | 1,498 |  | 1,642
Held-to-maturity securities, Gross Unrealized Losses | 11 |  | 25
Held-to-maturity securities, Estimated Fair Value | 1,487 |  | 1,617
States and Political Subdivisions [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Held-to-maturity securities, Amortized Cost | 1,401 |  | 1,401
Held-to-maturity securities, Gross Unrealized Gains | 10 |  | 14
Held-to-maturity securities, Estimated Fair Value | 1,411 |  | 1,415
Mortgage-backed [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Amortized Cost | 118,652 |  | 124,162
Available-for-sale securities, Gross Unrealized Gains | 103 |  | 115
Available-for-sale securities, Gross Unrealized Losses | 1,752 |  | 3,481
Available-for-sale securities, Estimated Fair Value | 117,003 |  | 120,796
Other Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Held-to-maturity securities, Amortized Cost | 3,000 |  | 3,000
Held-to-maturity securities, Gross Unrealized Losses | 33 |  | 32
Held-to-maturity securities, Estimated Fair Value | $ 2,967 |  | $ 2,968

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