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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investment securities available for sale |  |
Cost | $ 8,884,548 | $ 7,052,152
Gross unrealized losses | 8,500 | 17,819
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Fair value | 9,019,788 | 7,059,674
Investment in marketable equity securities at cost | 100,408 | 59,262
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 3,353 | 23,304
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 10,687 | 233
Fair value | 93,074 | 82,333
Investment securities held to maturity |  |
Cost | 747,732 | 30,996
Gross unrealized gains | 13,555 |
Gross unrealized losses | 35 |
Allowance for credit loss on debt securities held to maturity | 0 |
Fair value | 761,252 | 30,996
Cost | 9,732,688 | 7,142,410
Gross unrealized gains | 160,648 | 48,645
Gross unrealized losses | 19,222 | 18,052
Debt Securities, Available-for-sale, Held-to-maturity and Equity Securities, Allowance for Credit Losses | 0 |
Fair value | 9,874,114 | 7,173,003
Investment securities available for sale at cost | 8,884,548 | 7,052,152
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 143,740 | 25,341
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 8,500 | 17,819
Debt Securities, Available-for-sale | 9,019,788 | 7,059,674
Interest receivable, available-for-sale debt securities | 23,600 |
Interest receivable, held-to-maturity debt securities | 1,700 |
U.S. Treasury |  |
Investment securities available for sale |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Investment securities held to maturity |  |
Investment securities available for sale at cost | 654,588 | 409,397
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 174 | 602
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Debt Securities, Available-for-sale | 654,762 | 409,999
Government agency |  |
Investment securities available for sale |  |
Gross unrealized losses | 4,961 | 2,241
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Investment securities held to maturity |  |
Investment securities available for sale at cost | 659,260 | 684,085
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 642 | 928
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 4,961 | 2,241
Debt Securities, Available-for-sale | 654,941 | 682,772
Residential Mortgage Backed Securities |  |
Investment securities available for sale |  |
Gross unrealized losses | 312 | 15,387
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Investment securities held to maturity |  |
Cost | 614,489 | 0
Gross unrealized gains | 12,905 |
Gross unrealized losses | 0 |
Allowance for credit loss on debt securities held to maturity | 0 |
Fair value | 627,394 |
Investment securities available for sale at cost | 5,968,192 | 5,269,060
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 101,788 | 13,417
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 312 | 15,387
Debt Securities, Available-for-sale | 6,069,668 | 5,267,090
Commercial Mortgage Backed Securities |  |
Investment securities available for sale |  |
Cost | 1,058,640 | 373,105
Gross unrealized gains | 32,004 | 6,974
Gross unrealized losses | 434 | 59
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Fair value | 1,090,210 | 380,020
Investment securities held to maturity |  |
Cost | 130,987 | 0
Gross unrealized gains | 650 |
Gross unrealized losses | 35 |
Allowance for credit loss on debt securities held to maturity |  |
Fair value | 131,602 |
Residential mortgage-backed securities |  |
Investment securities held to maturity |  |
Cost |  | 30,996
Gross unrealized gains |  | 0
Gross unrealized losses |  | 0
Fair value |  | 30,996
Commercial mortgage-backed securities |  |
Investment securities available for sale |  |
Gross unrealized losses | 2,793 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Investment securities held to maturity |  |
Investment securities available for sale at cost | 543,868 | 198,278
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 9,132 | 3,420
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2,793 | 132
Debt Securities, Available-for-sale | 550,207 | 201,566
US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available for sale |  |
Cost |  | 118,227
Gross unrealized gains |  | 0
Gross unrealized losses |  | 0
Fair value |  | 118,227
Other |  |
Investment securities held to maturity |  |
Cost | 2,256 | 30,996
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Allowance for credit loss on debt securities held to maturity | 0 |
Fair value | $ 2,256 | $ 30,996

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