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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Total temporarily impaired securities Fair Value | $ 262,281 | $ 214,027
Total temporarily impaired securities Unrealized Losses | 9,147 | 1,782
Total temporarily impaired securities Fair Value | 125,104 | 128,965
Total temporarily impaired securities Unrealized Losses | 5,379 | 1,972
Total temporarily impaired securities Fair Value | 387,385 | 342,992
Total temporarily impaired securities Unrealized Losses | 14,526 | 3,754
Government-sponsored enterprise securities [Member] |  |
AFS Fair Value | 9,687 | 10,897
AFS Unrealized Losses | 313 | 103
AFS Fair Value | 8,735 | 2,970
AFS Unrealized Losses | 265 | 30
Total temporarily impaired securities Fair Value | 18,422 | 13,867
Total temporarily impaired securities Unrealized Losses | 578 | 133
Mortgage-backed securities [Member] |  |
AFS Fair Value | 211,002 | 192,702
AFS Unrealized Losses | 8,222 | 1,582
AFS Fair Value | 115,439 | 125,060
AFS Unrealized Losses | 5,044 | 1,877
Total temporarily impaired securities Fair Value | 326,441 | 317,762
Total temporarily impaired securities Unrealized Losses | 13,266 | 3,459
Corporate bonds [Member] |  |
AFS Fair Value | 31,235 | 2,500
AFS Unrealized Losses | 521 | 49
AFS Fair Value | 930 | 935
AFS Unrealized Losses | 70 | 65
Total temporarily impaired securities Fair Value | 32,165 | 3,435
Total temporarily impaired securities Unrealized Losses | 591 | 114
State and local governments [Member] |  |
HTM Fair Value | 10,357 | 7,928
HTM Unrealized Losses | 91 | 48
AFS Fair Value |  |
AFS Unrealized Losses |  |
Total temporarily impaired securities Fair Value | 10,357 | 7,928
Total temporarily impaired securities Unrealized Losses | $ 91 | $ 48

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