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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 998,312 | $ 442,773
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 10,661 | 4,928
Available for sale, Losses 12 months or longer, Fair Value | 599,072 | 1,687,704
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 4,012 | 67,340
Available for sale, Total, Fair Value | 1,597,384 | 2,130,477
Available for sale, Total, Gross Unrealized Losses | 14,673 | 72,268
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 | 28,235 |
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 300 |
Available for sale, Losses 12 months or longer, Fair Value |  | 71,706
Available for sale, Losses 12 months or longer, Gross Unrealized Losses |  | 2,633
Available for sale, Total, Fair Value | 28,235 | 71,706
Available for sale, Total, Gross Unrealized Losses | 300 | 2,633
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value |  | 41,203
Available for sale, Losses less than 12 months, Gross Unrealized Losses |  | 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 |  | 212,086
Available for sale, Total, Gross Unrealized Losses |  | 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 | 420,066 | 305,090
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 5,042 | 2,485
Available for sale, Losses 12 months or longer, Fair Value | 399,787 | 762,826
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,978 | 27,309
Available for sale, Total, Fair Value | 819,853 | 1,067,916
Available for sale, Total, Gross Unrealized Losses | 7,020 | 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 | 458,855 | 96,226
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 3,971 | 1,851
Available for sale, Losses 12 months or longer, Fair Value | 14,896 | 570,485
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 207 | 29,085
Available for sale, Total, Fair Value | 473,751 | 666,711
Available for sale, Total, Gross Unrealized Losses | 4,178 | 30,936
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 89,689 | 254
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 1,315 | 1
Available for sale, Losses 12 months or longer, Fair Value | 184,389 | 111,804
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,827 | 2,259
Available for sale, Total, Fair Value | 274,078 | 112,058
Available for sale, Total, Gross Unrealized Losses | 3,142 | $ 2,260
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 1,467 |
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 33 |
Available for sale, Total, Fair Value | 1,467 |
Available for sale, Total, Gross Unrealized Losses | $ 33 |

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