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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | $ 17,423 | $ 66,623
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 1,986 | 552
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 24,036 | 19,787
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 4,074 | 3,894
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 4,332 | 26,900
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 15 | 237
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 1,224 | 0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 8 | 0
US government agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value |  | 23,929
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses |  | 129
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value |  | 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses |  | 0
Residential mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 0 | 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 7,709 | 8,051
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 60 | 220
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 4,332 | 11,085
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 15 | 98
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 1,224 | 0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 8 | 0
Commercial mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 3,087 | 25,858
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 16 | 196
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 0 | 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 0 | 0
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value |  | 9,518
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss |  | 17
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value |  | 0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss |  | 0
Collateralized mortgage obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 0 | 5,299
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 123
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 5,209 | 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 25 | 0
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 0 | 6,297
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 0 | 122
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 0 | 0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 0 | 0
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 | 2,093 | 11,537
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 8 | 104
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 3,829 | 4,048
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 42 | 119
Collateralized debt obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 12,243 | 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 1,962 | 0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 7,289 | 7,688
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 3,947 | $ 3,555

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