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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 34,495 | $ 998,312
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 355 | 10,661
Available for sale, Losses 12 months or longer, Fair Value | 1,688 | 599,072
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 5 | 4,012
Available for sale, Total, Fair Value | 36,183 | 1,597,384
Available for sale, Total, Gross Unrealized Losses | 360 | 14,673
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 | 7,807 | 28,235
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 223 | 300
Available for sale, Total, Fair Value | 7,807 | 28,235
Available for sale, Total, Gross Unrealized Losses | 223 | 300
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 714 | 420,066
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 5 | 5,042
Available for sale, Losses 12 months or longer, Fair Value | 1,688 | 399,787
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 5 | 1,978
Available for sale, Total, Fair Value | 2,402 | 819,853
Available for sale, Total, Gross Unrealized Losses | 10 | 7,020
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 25,196 | 458,855
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 105 | 3,971
Available for sale, Losses 12 months or longer, Fair Value |  | 14,896
Available for sale, Losses 12 months or longer, Gross Unrealized Losses |  | 207
Available for sale, Total, Fair Value | 25,196 | 473,751
Available for sale, Total, Gross Unrealized Losses | 105 | 4,178
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value |  | 89,689
Available for sale, Losses less than 12 months, Gross Unrealized Losses |  | 1,315
Available for sale, Losses 12 months or longer, Fair Value |  | 184,389
Available for sale, Losses 12 months or longer, Gross Unrealized Losses |  | 1,827
Available for sale, Total, Fair Value |  | 274,078
Available for sale, Total, Gross Unrealized Losses |  | 3,142
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 778 | 1,467
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 22 | 33
Available for sale, Total, Fair Value | 778 | 1,467
Available for sale, Total, Gross Unrealized Losses | $ 22 | $ 33

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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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