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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) - USD ($) $ in Thousands | Sep. 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 | $ 10,319 | $ 47,594
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 345 | 754
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 116,949 | 82,737
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 7,114 | 6,695
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 58,057 | 27,302
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 1,390 | 149
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 25,373 | 14,540
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 1,418 | 357
US government agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 0 | 4,931
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 69
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 28,565 | 24,325
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 1,435 | 675
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 15,822 |
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 160 |
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 | 23,860 | 15,897
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 741 | 135
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 21,864 | 10,422
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 1,158 | 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 | 0 | 12,593
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 169
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 37,631 | 28,298
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 1,802 | 711
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 16,229 | 9,028
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 340 | 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 | 300 | 27,387
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 1 | 472
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 35,822 | 12,447
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 1,777 | 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 | 3,509 | 4,118
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 260 | 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 | 10,019 | 2,683
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 344 | 44
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 4,842 | 2,747
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 243 | 75
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 2,146 | 2,377
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 149 | 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 | 10,089 | 14,920
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 1,857 | $ 4,791

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