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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Losses less than 12 months, Fair Value | $ 110,726 | $ 442,773
Securities available for sale, Losses less than 12 months, Gross Unrealized Losses | 898 | 4,928
Securities available for sale, Losses 12 months or longer, Fair Value | 457,528 | 1,687,704
Securities available for sale, Losses 12 months or longer, Gross Unrealized Losses | 2,308 | 67,340
Securities available for sale, Total, Fair Value | 568,254 | 2,130,477
Available for sale, Total, Gross Unrealized Losses | 3,206 | 72,268
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Losses 12 months or longer, Fair Value |  | 71,706
Securities available for sale, Losses 12 months or longer, Gross Unrealized Losses |  | 2,633
Securities available for sale, Total, Fair Value |  | 71,706
Available for sale, Total, Gross Unrealized Losses |  | 2,633
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Losses less than 12 months, Fair Value |  | 41,203
Securities available for sale, Losses less than 12 months, Gross Unrealized Losses |  | 591
Securities available for sale, Losses 12 months or longer, Fair Value |  | 170,883
Securities available for sale, Losses 12 months or longer, Gross Unrealized Losses |  | 6,054
Securities available for sale, Total, Fair Value |  | 212,086
Available for sale, Total, Gross Unrealized Losses |  | 6,645
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Losses less than 12 months, Fair Value | 2 | 305,090
Securities available for sale, Losses less than 12 months, Gross Unrealized Losses |  | 2,485
Securities available for sale, Losses 12 months or longer, Fair Value | 438,339 | 762,826
Securities available for sale, Losses 12 months or longer, Gross Unrealized Losses | 2,236 | 27,309
Securities available for sale, Total, Fair Value | 438,341 | 1,067,916
Available for sale, Total, Gross Unrealized Losses | 2,236 | 29,794
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Losses less than 12 months, Fair Value | 108,208 | 96,226
Securities available for sale, Losses less than 12 months, Gross Unrealized Losses | 844 | 1,851
Securities available for sale, Losses 12 months or longer, Fair Value | 15,098 | 570,485
Securities available for sale, Losses 12 months or longer, Gross Unrealized Losses | 9 | 29,085
Securities available for sale, Total, Fair Value | 123,306 | 666,711
Available for sale, Total, Gross Unrealized Losses | 853 | 30,936
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Losses less than 12 months, Fair Value | 613 | 254
Securities available for sale, Losses less than 12 months, Gross Unrealized Losses |  | 1
Securities available for sale, Losses 12 months or longer, Fair Value | 4,091 | 111,804
Securities available for sale, Losses 12 months or longer, Gross Unrealized Losses | 63 | 2,259
Securities available for sale, Total, Fair Value | 4,704 | 112,058
Available for sale, Total, Gross Unrealized Losses | 63 | $ 2,260
Other Debt Obligation [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Losses less than 12 months, Fair Value | 1,903 |
Securities available for sale, Losses less than 12 months, Gross Unrealized Losses | 54 |
Securities available for sale, Total, Fair Value | 1,903 |
Available for sale, Total, Gross Unrealized Losses | $ 54 |

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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=118939692&loc=d3e27337-111563 + Details
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