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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | $ 99,796 | $ 98,642
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 2,104 | 2,063
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 23,336 | 23,188
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 7,496 | 7,767
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 29,871 | 27,918
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 535 | 598
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
US government agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 24,297 | 24,253
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 703 | 747
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
Residential mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 22,960 | 20,899
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 348 | 279
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
Commercial mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 50,394 | 51,604
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 927 | 757
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 |  | 4,684
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss |  | 149
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 | 18,445 | 14,706
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 370 | 399
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 | 4,491 |
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 102 |
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 |
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 | 6,660 | 8,079
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 104 | 160
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 2,979 | 2,934
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 63 | 91
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 2,420 | 2,335
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 85 | 170
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
Collateralized debt obligations [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 | 20,357 | 20,254
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 7,433 | $ 7,676

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