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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | $ 1,652,124 | $ 768,589
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 28,032 | 6,515
Held to maturity, Losses 12 months or longer, Fair Value | 1,008,026 | 1,055,983
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 36,528 | 22,096
Held to maturity, Total, Fair Value | 2,660,150 | 1,824,572
Held to maturity, Total, Gross Unrealized Losses | 64,560 | 28,611
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses 12 months or longer, Fair Value | 49,424 | 49,711
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 576 | 289
Held to maturity, Total, Fair Value | 49,424 | 49,711
Held to maturity, Total, Gross Unrealized Losses | 576 | 289
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 341,011 | 14,603
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 4,530 | 19
Held to maturity, Losses 12 months or longer, Fair Value | 221,438 | 230,960
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 8,923 | 4,226
Held to maturity, Total, Fair Value | 562,449 | 245,563
Held to maturity, Total, Gross Unrealized Losses | 13,453 | 4,245
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 403,985 | 8,815
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 4,090 | 99
Held to maturity, Losses 12 months or longer, Fair Value | 224,200 | 230,277
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 6,534 | 2,591
Held to maturity, Total, Fair Value | 628,185 | 239,092
Held to maturity, Total, Gross Unrealized Losses | 10,624 | 2,690
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 234,468 | 174,882
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 6,845 | 744
Held to maturity, Losses 12 months or longer, Fair Value | 71,098 | 72,499
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 4,555 | 3,171
Held to maturity, Total, Fair Value | 305,566 | 247,381
Held to maturity, Total, Gross Unrealized Losses | 11,400 | 3,915
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 672,660 | 570,289
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 12,567 | 5,653
Held to maturity, Losses 12 months or longer, Fair Value | 441,866 | 472,536
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 15,940 | 11,819
Held to maturity, Total, Fair Value | 1,114,526 | 1,042,825
Held to maturity, Total, Gross Unrealized Losses | $ 28,507 | $ 17,472

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