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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 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 | $ 1,063,994 | $ 842,011
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 25,125 | 6,319
Available for sale, Losses 12 months or longer, Fair Value | 1,710,404 | 1,569,320
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 87,749 | 39,099
Available for sale, Total, Fair Value | 2,774,398 | 2,411,331
Available for sale, Total, Gross Unrealized Losses | 112,874 | 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 | 42,423 | 45,616
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 1,812 | 42
Available for sale, Losses 12 months or longer, Fair Value | 48,562 | 51,157
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 2,672 | 2,221
Available for sale, Total, Fair Value | 90,985 | 96,773
Available for sale, Total, Gross Unrealized Losses | 4,484 | 2,263
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 54,121 | 2,768
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 984 | 11
Available for sale, Losses 12 months or longer, Fair Value | 168,133 | 173,530
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 7,536 | 3,335
Available for sale, Total, Fair Value | 222,254 | 176,298
Available for sale, Total, Gross Unrealized Losses | 8,520 | 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 | 559,924 | 461,835
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 8,483 | 4,195
Available for sale, Losses 12 months or longer, Fair Value | 1,066,016 | 898,099
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 45,844 | 16,192
Available for sale, Total, Fair Value | 1,625,940 | 1,359,934
Available for sale, Total, Gross Unrealized Losses | 54,327 | 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 | 291,635 | 203,618
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 10,839 | 995
Available for sale, Losses 12 months or longer, Fair Value | 396,809 | 411,046
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 30,551 | 16,868
Available for sale, Total, Fair Value | 688,444 | 614,664
Available for sale, Total, Gross Unrealized Losses | 41,390 | 17,863
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 115,891 | 128,174
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 3,007 | 1,076
Available for sale, Losses 12 months or longer, Fair Value | 30,884 | 35,488
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,146 | 483
Available for sale, Total, Fair Value | 146,775 | 163,662
Available for sale, Total, Gross Unrealized Losses | $ 4,153 | $ 1,559

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