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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 25,105 | $ 442,773
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 15 | 4,928
Available for sale, Losses 12 months or longer, Fair Value | 1,135,952 | 1,687,704
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 9,571 | 67,340
Available for sale, Total, Fair Value | 1,161,057 | 2,130,477
Available for sale, Total, Gross Unrealized Losses | 9,586 | 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 | 21,215 | 71,706
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 149 | 2,633
Available for sale, Total, Fair Value | 21,215 | 71,706
Available for sale, Total, Gross Unrealized Losses | 149 | 2,633
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 2,292 | 41,203
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 3 | 591
Available for sale, Losses 12 months or longer, Fair Value |  | 170,883
Available for sale, Losses 12 months or longer, Gross Unrealized Losses |  | 6,054
Available for sale, Total, Fair Value | 2,292 | 212,086
Available for sale, Total, Gross Unrealized Losses | 3 | 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 | 1 | 305,090
Available for sale, Losses less than 12 months, Gross Unrealized Losses |  | 2,485
Available for sale, Losses 12 months or longer, Fair Value | 689,726 | 762,826
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 6,776 | 27,309
Available for sale, Total, Fair Value | 689,727 | 1,067,916
Available for sale, Total, Gross Unrealized Losses | 6,776 | 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 | 22,112 | 96,226
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 12 | 1,851
Available for sale, Losses 12 months or longer, Fair Value | 367,211 | 570,485
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 2,368 | 29,085
Available for sale, Total, Fair Value | 389,323 | 666,711
Available for sale, Total, Gross Unrealized Losses | 2,380 | 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 | 57,800 | 111,804
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 278 | 2,259
Available for sale, Total, Fair Value | 57,800 | 112,058
Available for sale, Total, Gross Unrealized Losses | 278 | $ 2,260
Other Debt Obligation [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 700 |
Available for sale, Total, Fair Value | $ 700 |

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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