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Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details) $ in Thousands | Sep. 30, 2022 USD ($) Security | Dec. 31, 2021 USD ($) Security
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 790 | 89
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 2,330,166 | $ 917,933
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (346,462) | $ (13,925)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 41 | 119
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 253,621 | $ 91,336
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (64,495) | (2,331)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,583,787 | 1,009,269
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (410,957) | $ (16,256)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 141 | 50
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 647,193 | $ 762,923
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (66,520) | $ (25,539)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 39 | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | $ 494,517 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (131,080) | 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 1,141,710 | 762,923
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | $ (197,600) | $ (25,539)
US Government Debt Securities |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 3 | 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 218,184 | $ 127,618
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (8,255) | $ (213)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 0 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 218,184 | 127,618
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (8,255) | $ (213)
US Government Agencies Debt Securities |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 1 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,006 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (47) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,006 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (47) |
State and Municipal Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 395 | 29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 982,919 | $ 82,731
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (228,508) | $ (678)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 22 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 45,759 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (20,459) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,028,678 | 82,731
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (248,967) | $ (678)
Corporate Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 68 | 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 386,141 | $ 43,068
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (35,547) | $ (358)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 2 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 10,718 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,281) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 396,859 | 43,068
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (36,828) | $ (358)
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 100 | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 121,120 | $ 28,517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (7,182) | $ (754)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 1 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 21,281 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (5,427) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 142,401 | 28,517
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (12,609) | $ (754)
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 101 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 157,808 | $ 123,687
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (19,901) | $ (2,388)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 4 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 55,110 | $ 16,669
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (12,707) | (648)
Debt Securities, Available-for-sale, Unrealized Loss Position | 212,918 | 140,356
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (32,608) | $ (3,036)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 108 | 14
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 270,986 | $ 205,969
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (20,485) | $ (7,067)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 12 | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | $ 139,012 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (40,396) | 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 409,998 | 205,969
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | $ (60,881) | $ (7,067)
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 122 | 41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 462,988 | $ 512,312
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (47,022) | $ (9,534)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 12 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 120,753 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (24,621) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 583,741 | 512,312
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (71,643) | $ (9,534)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 33 | 36
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 376,207 | $ 556,954
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (46,035) | $ (18,472)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 27 | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | $ 355,505 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (90,684) | 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 731,712 | 556,954
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | $ (136,719) | $ (18,472)
Auction Rate Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security |  | 118
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | $ 74,667
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (1,683)
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 74,667
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | $ (1,683)

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