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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) $ in Thousands | Jun. 30, 2019 USD ($) item | Dec. 31, 2018 USD ($) item
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Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | $ 5,848 | $ 9,529
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | $ 612 | $ 487
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item | 4 | 10
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | $ 66,025 | $ 122,608
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 3,416 | $ 6,127
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 17 | 34
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | $ 5,287 | $ 3,605
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | $ 16 | $ 51
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, Number of Investments | item | 2 | 2
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | $ 19,088 | $ 54,908
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | $ 329 | $ 1,556
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 20 | 32
US government agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | $ 29,833 | $ 29,026
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 167 | $ 974
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 5 | 5
Residential mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | $ 5,287 | $ 3,605
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | $ 16 | $ 51
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, Number of Investments | item | 2 | 2
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | $ 19,088 | $ 41,448
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | $ 329 | $ 1,236
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 20 | 29
Commercial mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | $ 18,918 | $ 37,752
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 284 | $ 1,261
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 5 | 8
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value |  | $ 7,656
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss |  | $ 68
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item |  | 1
Collateralized mortgage obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value |  | $ 232
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses |  | $ 1
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item |  | 1
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | $ 8,250 | $ 35,472
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 62 | $ 964
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 2 | 8
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value |  | $ 3,605
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss |  | $ 156
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item |  | 1
Obligations of states and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value |  | $ 3,310
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses |  | $ 48
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item |  | 5
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value |  | $ 11,068
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses |  | $ 285
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item |  | 8
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value |  | $ 2,199
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss |  | $ 96
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item |  | 1
Collateralized debt obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | $ 5,848 | $ 5,987
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | $ 612 | $ 438
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item | 4 | 4
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | $ 9,024 | $ 9,290
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 2,903 | $ 2,643
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item | 5 | 5

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