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Securities (Summary of Gross Unrealized Losses and Fair Value of Debt Securities Available-for-Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,202,775 | $ 3,195,732
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (85,581) | (43,236)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,328,941 | 383,754
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (608,749) | (14,645)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 4,531,716 | 3,579,486
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 694,330 | 57,881
Asset-backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 76,877 | 195,708
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (7,579) | (4,823)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 250,475 | 117,751
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (41,404) | (4,968)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 327,352 | 313,459
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 48,983 | 9,791
State and Municipal Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 309,675 | 237,354
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (23,690) | (3,862)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 485,620 | 40,343
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (101,905) | (1,076)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 795,295 | 277,697
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 125,595 | 4,938
U.S. Government Agency and Government-Sponsored Enterprise Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 68,656 | 100,813
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,375) | (1,988)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 139,364 | 48,714
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (12,687) | (1,286)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 208,020 | 149,527
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 14,062 | 3,274
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 735,898 | 2,292,062
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (50,201) | (30,777)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,005,957 | 176,946
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (378,852) | (7,315)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,741,855 | 2,469,008
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 429,053 | 38,092
US Government Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 157,536
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (831)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 167,896 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (15,153) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 167,896 | 157,536
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 15,153 | 831
Non-agency collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 11,669 | 212,259
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2,736) | (955)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 279,629 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (58,748) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 291,298 | 212,259
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 61,484 | $ 955

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