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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 559,367 | $ 998,312
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 1,744 | 10,661
Available for sale, Losses 12 months or longer, Fair Value | 367 | 599,072
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 2 | 4,012
Available for sale, Total, Fair Value | 559,734 | 1,597,384
Available for sale, Total, Gross Unrealized Losses | 1,746 | 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 | 44,039 | 28,235
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 125 | 300
Available for sale, Total, Fair Value | 44,039 | 28,235
Available for sale, Total, Gross Unrealized Losses | 125 | 300
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 26,010 |
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 347 |
Available for sale, Total, Fair Value | 26,010 |
Available for sale, Total, Gross Unrealized Losses | 347 |
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 229,662 | 420,066
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 529 | 5,042
Available for sale, Losses 12 months or longer, Fair Value | 367 | 399,787
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 2 | 1,978
Available for sale, Total, Fair Value | 230,029 | 819,853
Available for sale, Total, Gross Unrealized Losses | 531 | 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 | 252,858 | 458,855
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 720 | 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 | 252,858 | 473,751
Available for sale, Total, Gross Unrealized Losses | 720 | 4,178
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 3,300 | 89,689
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 21 | 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 | 3,300 | 274,078
Available for sale, Total, Gross Unrealized Losses | 21 | 3,142
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 3,498 | 1,467
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 2 | 33
Available for sale, Total, Fair Value | 3,498 | 1,467
Available for sale, Total, Gross Unrealized Losses | $ 2 | $ 33

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