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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 2,910 | $ 442,773
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 46 | 4,928
Available for sale, Losses 12 months or longer, Fair Value | 1,723,677 | 1,687,704
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 35,342 | 67,340
Available for sale, Total, Fair Value | 1,726,587 | 2,130,477
Available for sale, Total, Gross Unrealized Losses | 35,388 | 72,268
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses 12 months or longer, Fair Value | 72,143 | 71,706
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,283 | 2,633
Available for sale, Total, Fair Value | 72,143 | 71,706
Available for sale, Total, Gross Unrealized Losses | 1,283 | 2,633
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 2,270 | 41,203
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 40 | 591
Available for sale, Losses 12 months or longer, Fair Value | 106,042 | 170,883
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,560 | 6,054
Available for sale, Total, Fair Value | 108,312 | 212,086
Available for sale, Total, Gross Unrealized Losses | 1,600 | 6,645
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 640 | 305,090
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 6 | 2,485
Available for sale, Losses 12 months or longer, Fair Value | 852,716 | 762,826
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 15,807 | 27,309
Available for sale, Total, Fair Value | 853,356 | 1,067,916
Available for sale, Total, Gross Unrealized Losses | 15,813 | 29,794
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
Available for sale, Losses less than 12 months, Gross Unrealized Losses |  | 1,851
Available for sale, Losses 12 months or longer, Fair Value | 583,978 | 570,485
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 15,207 | 29,085
Available for sale, Total, Fair Value | 583,978 | 666,711
Available for sale, Total, Gross Unrealized Losses | 15,207 | 30,936
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value |  | 254
Available for sale, Losses less than 12 months, Gross Unrealized Losses |  | 1
Available for sale, Losses 12 months or longer, Fair Value | 108,798 | 111,804
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,485 | 2,259
Available for sale, Total, Fair Value | 108,798 | 112,058
Available for sale, Total, Gross Unrealized Losses | $ 1,485 | $ 2,260

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