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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Total temporarily impaired securities Fair Value | $ 108,745 | $ 214,027
Total temporarily impaired securities Unrealized Losses | 863 | 1,782
Securities in an Unrealized Loss Position for More than 12 Months |  |
Total temporarily impaired securities Fair Value | 320,445 | 128,965
Total temporarily impaired securities Unrealized Losses | 13,561 | 1,972
Total temporarily impaired securities Fair Value | 429,190 | 342,992
Total temporarily impaired securities Unrealized Losses | 14,424 | 3,754
Government-sponsored enterprise securities [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 4,921 | 10,897
AFS Unrealized Losses | 78 | 103
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 13,682 | 2,970
AFS Unrealized Losses | 318 | 30
Total temporarily impaired securities Fair Value | 18,603 | 13,867
Total temporarily impaired securities Unrealized Losses | 396 | 133
Mortgage-backed securities [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 82,525 | 192,702
AFS Unrealized Losses | 351 | 1,582
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 294,305 | 125,060
AFS Unrealized Losses | 12,939 | 1,877
Total temporarily impaired securities Fair Value | 376,830 | 317,762
Total temporarily impaired securities Unrealized Losses | 13,290 | 3,459
Corporate bonds [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 20,704 | 2,500
AFS Unrealized Losses | 433 | 49
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 5,817 | 935
AFS Unrealized Losses | 256 | 65
Total temporarily impaired securities Fair Value | 26,521 | 3,435
Total temporarily impaired securities Unrealized Losses | 689 | 114
State and local governments [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 595 | 7,928
AFS Unrealized Losses | 1 | 48
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 6,641 |
AFS Unrealized Losses | 48 |
Total temporarily impaired securities Fair Value | 7,236 | 7,928
Total temporarily impaired securities Unrealized Losses | $ 49 | $ 48

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