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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 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 | $ 1,154,658 | $ 842,011
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 27,244 | 6,319
Available for sale, Losses 12 months or longer, Fair Value | 1,503,947 | 1,569,320
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 69,822 | 39,099
Available for sale, Total, Fair Value | 2,658,605 | 2,411,331
Available for sale, Total, Gross Unrealized Losses | 97,066 | 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 | 43,521 | 45,616
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 1,214 | 42
Available for sale, Losses 12 months or longer, Fair Value | 50,362 | 51,157
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 2,333 | 2,221
Available for sale, Total, Fair Value | 93,883 | 96,773
Available for sale, Total, Gross Unrealized Losses | 3,547 | 2,263
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 54,330 | 2,768
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 948 | 11
Available for sale, Losses 12 months or longer, Fair Value | 169,119 | 173,530
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 7,136 | 3,335
Available for sale, Total, Fair Value | 223,449 | 176,298
Available for sale, Total, Gross Unrealized Losses | 8,084 | 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 | 654,990 | 461,835
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 14,667 | 4,195
Available for sale, Losses 12 months or longer, Fair Value | 850,853 | 898,099
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 32,724 | 16,192
Available for sale, Total, Fair Value | 1,505,843 | 1,359,934
Available for sale, Total, Gross Unrealized Losses | 47,391 | 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 | 279,631 | 203,618
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 8,091 | 995
Available for sale, Losses 12 months or longer, Fair Value | 400,641 | 411,046
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 26,997 | 16,868
Available for sale, Total, Fair Value | 680,272 | 614,664
Available for sale, Total, Gross Unrealized Losses | 35,088 | 17,863
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 122,186 | 128,174
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 2,324 | 1,076
Available for sale, Losses 12 months or longer, Fair Value | 32,972 | 35,488
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 632 | 483
Available for sale, Total, Fair Value | 155,158 | 163,662
Available for sale, Total, Gross Unrealized Losses | $ 2,956 | $ 1,559

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