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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 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 | $ 1,675,758 | $ 768,589
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 36,693 | 6,515
Held to maturity, Losses 12 months or longer, Fair Value | 1,214,258 | 1,055,983
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 57,469 | 22,096
Held to maturity, Total, Fair Value | 2,890,016 | 1,824,572
Held to maturity, Total, Gross Unrealized Losses | 94,162 | 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 | 49,292 | 49,711
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 708 | 289
Held to maturity, Total, Fair Value | 49,292 | 49,711
Held to maturity, Total, Gross Unrealized Losses | 708 | 289
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 378,622 | 14,603
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 7,288 | 19
Held to maturity, Losses 12 months or longer, Fair Value | 217,955 | 230,960
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 10,521 | 4,226
Held to maturity, Total, Fair Value | 596,577 | 245,563
Held to maturity, Total, Gross Unrealized Losses | 17,809 | 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 | 454,003 | 8,815
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 6,996 | 99
Held to maturity, Losses 12 months or longer, Fair Value | 198,816 | 230,277
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 8,505 | 2,591
Held to maturity, Total, Fair Value | 652,819 | 239,092
Held to maturity, Total, Gross Unrealized Losses | 15,501 | 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 | 270,664 | 174,882
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 11,146 | 744
Held to maturity, Losses 12 months or longer, Fair Value | 69,335 | 72,499
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 6,283 | 3,171
Held to maturity, Total, Fair Value | 339,999 | 247,381
Held to maturity, Total, Gross Unrealized Losses | 17,429 | 3,915
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 572,469 | 570,289
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 11,263 | 5,653
Held to maturity, Losses 12 months or longer, Fair Value | 678,860 | 472,536
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 31,452 | 11,819
Held to maturity, Total, Fair Value | 1,251,329 | 1,042,825
Held to maturity, Total, Gross Unrealized Losses | $ 42,715 | $ 17,472

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