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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | $ 44,687 | $ 47,594
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 1,487 | 754
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 89,822 | 82,737
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 5,386 | 6,695
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 63,559 | 27,302
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 1,069 | 149
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 18,416 | 14,540
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 973 | 357
US government agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 4,838 | 4,931
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 162 | 69
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 23,913 | 24,325
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 1,087 | 675
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 15,934 |
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 12 |
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 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 | 29,047 | 15,897
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 696 | 135
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 14,645 | 10,422
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 755 | 288
Commercial mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 12,311 | 12,593
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 473 | 169
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 26,532 | 28,298
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 1,134 | 711
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 16,416 | 9,028
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 227 | 6
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 mortgage obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 16,826 | 27,387
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 619 | 472
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 20,799 | 12,447
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 859 | 443
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 0 | 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 0 | 0
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 3,771 | 4,118
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 218 | 69
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 | 10,712 | 2,683
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 233 | 44
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 2,431 | 2,747
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 96 | 75
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 2,162 | 2,377
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 134 | 8
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 | 16,147 | 14,920
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 2,210 | $ 4,791

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