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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 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 | $ 1,572,900 | $ 768,589
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 29,462 | 6,515
Held to maturity, Losses 12 months or longer, Fair Value | 1,229,621 | 1,055,983
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 49,587 | 22,096
Held to maturity, Total, Fair Value | 2,802,521 | 1,824,572
Held to maturity, Total, Gross Unrealized Losses | 79,049 | 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 | 49,332 | 49,711
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 668 | 289
Held to maturity, Total, Fair Value | 49,332 | 49,711
Held to maturity, Total, Gross Unrealized Losses | 668 | 289
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 364,751 | 14,603
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 5,081 | 19
Held to maturity, Losses 12 months or longer, Fair Value | 220,575 | 230,960
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 9,085 | 4,226
Held to maturity, Total, Fair Value | 585,326 | 245,563
Held to maturity, Total, Gross Unrealized Losses | 14,166 | 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 | 383,695 | 8,815
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 7,189 | 99
Held to maturity, Losses 12 months or longer, Fair Value | 211,897 | 230,277
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 7,541 | 2,591
Held to maturity, Total, Fair Value | 595,592 | 239,092
Held to maturity, Total, Gross Unrealized Losses | 14,730 | 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 | 232,031 | 174,882
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 9,079 | 744
Held to maturity, Losses 12 months or longer, Fair Value | 70,133 | 72,499
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 5,502 | 3,171
Held to maturity, Total, Fair Value | 302,164 | 247,381
Held to maturity, Total, Gross Unrealized Losses | 14,581 | 3,915
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 592,423 | 570,289
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 8,113 | 5,653
Held to maturity, Losses 12 months or longer, Fair Value | 677,684 | 472,536
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 26,791 | 11,819
Held to maturity, Total, Fair Value | 1,270,107 | 1,042,825
Held to maturity, Total, Gross Unrealized Losses | $ 34,904 | $ 17,472

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