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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Total temporarily impaired securities Fair Value | $ 72,958 | $ 108,745
Total temporarily impaired securities Unrealized Losses | 406 | 863
Total temporarily impaired securities Fair Value | 331,813 | 320,445
Total temporarily impaired securities Unrealized Losses | 8,545 | 13,561
Total temporarily impaired securities Fair Value | 404,771 | 429,190
Total temporarily impaired securities Unrealized Losses | 8,951 | 14,424
Government-sponsored enterprise securities [Member] |  |
AFS Fair Value |  | 4,921
AFS Unrealized Losses |  | 78
AFS Fair Value | 18,808 | 13,682
AFS Unrealized Losses | 192 | 318
Total temporarily impaired securities Fair Value | 18,808 | 18,603
Total temporarily impaired securities Unrealized Losses | 192 | 396
Mortgage-backed securities [Member] |  |
AFS Fair Value | 70,478 | 82,525
AFS Unrealized Losses | 346 | 351
AFS Fair Value | 298,133 | 294,305
AFS Unrealized Losses | 8,225 | 12,939
Total temporarily impaired securities Fair Value | 368,611 | 376,830
Total temporarily impaired securities Unrealized Losses | 8,571 | 13,290
Corporate bonds [Member] |  |
AFS Fair Value | 2,480 | 20,704
AFS Unrealized Losses | 60 | 433
AFS Fair Value | 9,049 | 5,817
AFS Unrealized Losses | 110 | 256
Total temporarily impaired securities Fair Value | 11,529 | 26,521
Total temporarily impaired securities Unrealized Losses | 170 | 689
State and local governments [Member] |  |
HTM Fair Value |  | 595
HTM Unrealized Losses |  | 1
AFS Fair Value | 5,823 | 6,641
AFS Unrealized Losses | 18 | 48
Total temporarily impaired securities Fair Value | 5,823 | 7,236
Total temporarily impaired securities Unrealized Losses | $ 18 | $ 49

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