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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 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 | $ 1,835,939 | $ 1,857,312
Available for Sale, Losses less than 12 months, Gross Unrealized Losses | 53,934 | 56,218
Available for Sale, Losses 12 months or longer, Fair Value | 3,110 | 3,738
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses | 76 | 69
Available for Sale, Total, Fair Value | 1,839,049 | 1,861,050
Available for Sale, Total, Gross Unrealized Losses | 54,010 | 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 | 74,460 | 54,788
Available for Sale, Losses less than 12 months, Gross Unrealized Losses | 1,553 | 1,923
Available for Sale, Total, Fair Value | 74,460 | 54,788
Available for Sale, Total, Gross Unrealized Losses | 1,553 | 1,923
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for Sale, Losses less than 12 months, Fair Value | 228,433 | 228,588
Available for Sale, Losses less than 12 months, Gross Unrealized Losses | 10,537 | 11,186
Available for Sale, Total, Fair Value | 228,433 | 228,588
Available for Sale, Total, Gross Unrealized Losses | 10,537 | 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 | 1,051,706 | 1,087,644
Available for Sale, Losses less than 12 months, Gross Unrealized Losses | 18,885 | 19,359
Available for Sale, Losses 12 months or longer, Fair Value | 3,110 | 3,738
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses | 76 | 69
Available for Sale, Total, Fair Value | 1,054,816 | 1,091,382
Available for Sale, Total, Gross Unrealized Losses | 18,961 | 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 | 403,123 | 402,591
Available for Sale, Losses less than 12 months, Gross Unrealized Losses | 22,360 | 23,159
Available for Sale, Total, Fair Value | 403,123 | 402,591
Available for Sale, Total, Gross Unrealized Losses | 22,360 | 23,159
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for Sale, Losses less than 12 months, Fair Value | 78,217 | 83,701
Available for Sale, Losses less than 12 months, Gross Unrealized Losses | 599 | 591
Available for Sale, Total, Fair Value | 78,217 | 83,701
Available for Sale, Total, Gross Unrealized Losses | $ 599 | $ 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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