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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 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 | $ 1,077,963 | $ 842,011
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 26,691 | 6,319
Available for sale, Losses 12 months or longer, Fair Value | 1,773,312 | 1,569,320
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 106,039 | 39,099
Available for sale, Total, Fair Value | 2,851,275 | 2,411,331
Available for sale, Total, Gross Unrealized Losses | 132,730 | 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 | 41,765 | 45,616
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 2,027 | 42
Available for sale, Losses 12 months or longer, Fair Value | 47,547 | 51,157
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 3,027 | 2,221
Available for sale, Total, Fair Value | 89,312 | 96,773
Available for sale, Total, Gross Unrealized Losses | 5,054 | 2,263
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 53,337 | 2,768
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 1,568 | 11
Available for sale, Losses 12 months or longer, Fair Value | 165,732 | 173,530
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 9,360 | 3,335
Available for sale, Total, Fair Value | 219,069 | 176,298
Available for sale, Total, Gross Unrealized Losses | 10,928 | 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 | 652,504 | 461,835
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 11,892 | 4,195
Available for sale, Losses 12 months or longer, Fair Value | 1,029,004 | 898,099
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 52,500 | 16,192
Available for sale, Total, Fair Value | 1,681,508 | 1,359,934
Available for sale, Total, Gross Unrealized Losses | 64,392 | 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 | 247,504 | 203,618
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 8,368 | 995
Available for sale, Losses 12 months or longer, Fair Value | 475,379 | 411,046
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 38,995 | 16,868
Available for sale, Total, Fair Value | 722,883 | 614,664
Available for sale, Total, Gross Unrealized Losses | 47,363 | 17,863
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 82,853 | 128,174
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 2,836 | 1,076
Available for sale, Losses 12 months or longer, Fair Value | 55,650 | 35,488
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 2,157 | 483
Available for sale, Total, Fair Value | 138,503 | 163,662
Available for sale, Total, Gross Unrealized Losses | $ 4,993 | $ 1,559

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