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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 44,634 | $ 47,594
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 1,215 | 754
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 91,636 | 82,737
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 6,644 | 6,695
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 45,252 | 27,302
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 880 | 149
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 16,378 | 14,540
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 780 | 357
US government agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 4,865 | 4,931
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 136 | 69
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 23,996 | 24,325
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 1,003 | 675
Residential mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 34,240 | 15,897
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 632 | 135
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 12,510 | 10,422
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 593 | 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 | 12,384 | 12,593
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 390 | 169
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 27,644 | 28,298
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 1,013 | 711
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 8,717 | 9,028
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 158 | 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 | 16,982 | 27,387
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 538 | 472
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 21,438 | 12,447
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 803 | 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 | 3,868 | 4,118
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 187 | 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 | 10,403 | 2,683
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 151 | 44
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 2,581 | 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 | 2,295 | 2,377
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 90 | 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 | 15,977 | 14,920
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 3,729 | $ 4,791

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