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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investment securities available for sale |  |
Cost | $ 8,472,398 | $ 7,052,152
Gross unrealized losses | 10,187 | 17,819
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Fair value | 8,619,282 | 7,059,674
Investment in marketable equity securities at cost | 116,322 | 59,262
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 6,297 | 23,304
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 8,303 | 233
Fair value | 114,316 | 82,333
Investment securities held to maturity |  |
Cost | 774,878 | 30,996
Gross unrealized gains | 16,447 |
Gross unrealized losses | 0 |
Allowance for credit loss on debt securities held to maturity | 0 |
Fair value | 791,325 | 30,996
Cost | 9,363,598 | 7,142,410
Gross unrealized gains | 179,815 | 48,645
Gross unrealized losses | 18,490 | 18,052
Debt Securities, Available-for-sale, Held-to-maturity and Equity Securities, Allowance for Credit Losses | 0 |
Fair value | 9,524,923 | 7,173,003
Investment securities available for sale at cost | 8,472,398 | 7,052,152
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 157,071 | 25,341
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 10,187 | 17,819
Debt Securities, Available-for-sale | 8,619,282 | 7,059,674
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 | 754,350 | 409,397
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 236 | 602
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Debt Securities, Available-for-sale | 754,586 | 409,999
Government agency |  |
Investment securities available for sale |  |
Gross unrealized losses | 4,256 | 2,241
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Investment securities held to maturity |  |
Investment securities available for sale at cost | 549,673 | 684,085
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 292 | 928
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 4,256 | 2,241
Debt Securities, Available-for-sale | 545,709 | 682,772
Residential Mortgage Backed Securities |  |
Investment securities available for sale |  |
Gross unrealized losses | 694 | 15,387
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Investment securities held to maturity |  |
Cost | 693,143 | 0
Gross unrealized gains | 16,196 |
Gross unrealized losses | 0 |
Allowance for credit loss on debt securities held to maturity | 0 |
Fair value | 709,339 |
Investment securities available for sale at cost | 5,671,151 | 5,269,060
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 119,935 | 13,417
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 694 | 15,387
Debt Securities, Available-for-sale | 5,790,392 | 5,267,090
Commercial Mortgage Backed Securities |  |
Investment securities available for sale |  |
Cost | 1,047,601 | 373,105
Gross unrealized gains | 32,221 | 6,974
Gross unrealized losses | 0 | 59
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Fair value | 1,079,822 | 380,020
Investment securities held to maturity |  |
Cost | 78,729 | 0
Gross unrealized gains | 251 |
Gross unrealized losses | 0 |
Allowance for credit loss on debt securities held to maturity |  |
Fair value | 78,980 |
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 | 5,237 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Investment securities held to maturity |  |
Investment securities available for sale at cost | 449,623 | 198,278
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4,387 | 3,420
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 5,237 | 132
Debt Securities, Available-for-sale | 448,773 | 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 | 3,006 | 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 | $ 3,006 | $ 30,996

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