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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 842,011 | $ 1,857,312
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 6,319 | 56,218
Available for sale, Losses 12 months or longer, Fair Value | 1,569,320 | 3,738
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 39,099 | 69
Available for sale, Total, Fair Value | 2,411,331 | 1,861,050
Available for sale, Total, Gross Unrealized Losses | 45,418 | 56,287
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 45,616 | 54,788
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 42 | 1,923
Available for sale, Losses 12 months or longer, Fair Value | 51,157 |
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 2,221 |
Available for sale, Total, Fair Value | 96,773 | 54,788
Available for sale, Total, Gross Unrealized Losses | 2,263 | 1,923
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 2,768 | 228,588
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 11 | 11,186
Available for sale, Losses 12 months or longer, Fair Value | 173,530 |
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 3,335 |
Available for sale, Total, Fair Value | 176,298 | 228,588
Available for sale, Total, Gross Unrealized Losses | 3,346 | 11,186
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 461,835 | 1,087,644
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 4,195 | 19,359
Available for sale, Losses 12 months or longer, Fair Value | 898,099 | 3,738
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 16,192 | 69
Available for sale, Total, Fair Value | 1,359,934 | 1,091,382
Available for sale, Total, Gross Unrealized Losses | 20,387 | 19,428
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 203,618 | 402,591
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 995 | 23,159
Available for sale, Losses 12 months or longer, Fair Value | 411,046 |
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 16,868 |
Available for sale, Total, Fair Value | 614,664 | 402,591
Available for sale, Total, Gross Unrealized Losses | 17,863 | 23,159
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 128,174 | 83,701
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 1,076 | 591
Available for sale, Losses 12 months or longer, Fair Value | 35,488 |
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 483 |
Available for sale, Total, Fair Value | 163,662 | 83,701
Available for sale, Total, Gross Unrealized Losses | $ 1,559 | $ 591

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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