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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | $ 768,589 | $ 1,513,235
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 6,515 | 34,152
Held to maturity, Losses 12 months or longer, Fair Value | 1,055,983 | 127,125
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 22,096 | 3,847
Held to maturity, Total, Fair Value | 1,824,572 | 1,640,360
Held to maturity, Total, Gross Unrealized Losses | 28,611 | 37,999
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value |  | 49,956
Held to maturity, Losses less than 12 months, Gross Unrealized Losses |  | 44
Held to maturity, Losses 12 months or longer, Fair Value | 49,711 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 289 |
Held to maturity, Total, Fair Value | 49,711 | 49,956
Held to maturity, Total, Gross Unrealized Losses | 289 | 44
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 14,603 | 494,470
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 19 | 19,706
Held to maturity, Losses 12 months or longer, Fair Value | 230,960 | 11,750
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 4,226 | 469
Held to maturity, Total, Fair Value | 245,563 | 506,220
Held to maturity, Total, Gross Unrealized Losses | 4,245 | 20,175
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 8,815 | 278,369
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 99 | 3,068
Held to maturity, Losses 12 months or longer, Fair Value | 230,277 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 2,591 |
Held to maturity, Total, Fair Value | 239,092 | 278,369
Held to maturity, Total, Gross Unrealized Losses | 2,690 | 3,068
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 174,882 | 71,701
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 744 | 4,038
Held to maturity, Losses 12 months or longer, Fair Value | 72,499 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 3,171 |
Held to maturity, Total, Fair Value | 247,381 | 71,701
Held to maturity, Total, Gross Unrealized Losses | 3,915 | 4,038
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 570,289 | 618,739
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 5,653 | 7,296
Held to maturity, Losses 12 months or longer, Fair Value | 472,536 | 115,375
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 11,819 | 3,378
Held to maturity, Total, Fair Value | 1,042,825 | 734,114
Held to maturity, Total, Gross Unrealized Losses | $ 17,472 | $ 10,674

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