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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 514,805 | $ 998,312
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 3,727 | 10,661
Available for sale, Losses 12 months or longer, Fair Value | 760 | 599,072
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 6 | 4,012
Available for sale, Total, Fair Value | 515,565 | 1,597,384
Available for sale, Total, Gross Unrealized Losses | 3,733 | 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 | 35,845 | 28,235
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 284 | 300
Available for sale, Total, Fair Value | 35,845 | 28,235
Available for sale, Total, Gross Unrealized Losses | 284 | 300
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 30,170 |
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 153 |
Available for sale, Total, Fair Value | 30,170 |
Available for sale, Total, Gross Unrealized Losses | 153 |
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 530 | 420,066
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 2 | 5,042
Available for sale, Losses 12 months or longer, Fair Value | 760 | 399,787
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 6 | 1,978
Available for sale, Total, Fair Value | 1,290 | 819,853
Available for sale, Total, Gross Unrealized Losses | 8 | 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 | 446,190 | 458,855
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 3,288 | 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 | 446,190 | 473,751
Available for sale, Total, Gross Unrealized Losses | 3,288 | 4,178
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 70 | 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 | 70 | 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 | 2,000 | 1,467
Available for sale, Losses less than 12 months, Gross Unrealized Losses |  | 33
Available for sale, Total, Fair Value | $ 2,000 | 1,467
Available for sale, Total, Gross Unrealized Losses |  | $ 33

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