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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 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 | $ 73,897 | $ 98,642
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 1,129 | 2,063
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 30,650 | 23,188
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 5,850 | 7,767
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 31,432 | 27,918
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 353 | 598
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 3,781 | 0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 102 | 0
US government agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 24,424 | 24,253
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 576 | 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 | 24,580 | 20,899
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 283 | 279
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 3,781 | 0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 102 | 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 | 22,827 | 51,604
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 187 | 757
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 9,801 | 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 331 | 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 | 24,556 | 14,706
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 346 | 399
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 3,707 | 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 54 | 0
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 4,476 |
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 61 |
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 | 2,090 | 8,079
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 20 | 160
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 2,795 | 2,934
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 50 | 91
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 2,376 | 2,335
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 9 | 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 | 14,347 | 20,254
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 5,415 | $ 7,676

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