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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 442,773 | $ 842,011
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 4,928 | 6,319
Available for sale, Losses 12 months or longer, Fair Value | 1,687,704 | 1,569,320
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 67,340 | 39,099
Available for sale, Total, Fair Value | 2,130,477 | 2,411,331
Available for sale, Total, Gross Unrealized Losses | 72,268 | 45,418
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
Available for sale, Losses less than 12 months, Gross Unrealized Losses |  | 42
Available for sale, Losses 12 months or longer, Fair Value | 71,706 | 51,157
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 2,633 | 2,221
Available for sale, Total, Fair Value | 71,706 | 96,773
Available for sale, Total, Gross Unrealized Losses | 2,633 | 2,263
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 41,203 | 2,768
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 591 | 11
Available for sale, Losses 12 months or longer, Fair Value | 170,883 | 173,530
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 6,054 | 3,335
Available for sale, Total, Fair Value | 212,086 | 176,298
Available for sale, Total, Gross Unrealized Losses | 6,645 | 3,346
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 305,090 | 461,835
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 2,485 | 4,195
Available for sale, Losses 12 months or longer, Fair Value | 762,826 | 898,099
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 27,309 | 16,192
Available for sale, Total, Fair Value | 1,067,916 | 1,359,934
Available for sale, Total, Gross Unrealized Losses | 29,794 | 20,387
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 96,226 | 203,618
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 1,851 | 995
Available for sale, Losses 12 months or longer, Fair Value | 570,485 | 411,046
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 29,085 | 16,868
Available for sale, Total, Fair Value | 666,711 | 614,664
Available for sale, Total, Gross Unrealized Losses | 30,936 | 17,863
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 254 | 128,174
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 1 | 1,076
Available for sale, Losses 12 months or longer, Fair Value | 111,804 | 35,488
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 2,259 | 483
Available for sale, Total, Fair Value | 112,058 | 163,662
Available for sale, Total, Gross Unrealized Losses | $ 2,260 | $ 1,559

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