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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 | Dec. 31, 2021 USD ($) Security | Dec. 31, 2020 USD ($) Security
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Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 89 | 22
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 917,933 | $ 266,636
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (13,925) | $ (1,660)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 119 | 163
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 91,336 | $ 105,077
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (2,331) | (3,618)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,009,269 | 371,713
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (16,256) | $ (5,278)
Held to Maturity |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 50 |
Estimated Fair Value, Less Than 12 Months | $ 762,923 |
Unrealized Losses, Less Than 12 Months | $ (25,539) |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 0 |
Estimated Fair Value, 12 Months or Longer | $ 0 |
Unrealized Losses, 12 Months or Longer | 0 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 762,923 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | $ (25,539) |
U.S. Government securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 2 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 127,618 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (213) |
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 | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 127,618 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (213) |
State and municipal securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 29 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 82,731 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (678) |
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 | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 82,731 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (678) |
Corporate debt securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 6 | 9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 43,068 | $ 44,528
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (358) | $ (377)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 0 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 0 | $ 6,871
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | (314)
Debt Securities, Available-for-sale, Unrealized Loss Position | 43,068 | 51,399
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (358) | $ (691)
Collateralized mortgage obligations |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 4 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 28,517 | $ 57,601
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (754) | $ (115)
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 | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 28,517 | 57,601
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (754) | $ (115)
Residential mortgage-backed securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 7 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 123,687 | $ 20,124
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (2,388) | $ (27)
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 | $ 16,669 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (648) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 140,356 | 20,124
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (3,036) | $ (27)
Held to Maturity |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 14 |
Estimated Fair Value, Less Than 12 Months | $ 205,969 |
Unrealized Losses, Less Than 12 Months | $ (7,067) |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 0 |
Estimated Fair Value, 12 Months or Longer | $ 0 |
Unrealized Losses, 12 Months or Longer | 0 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 205,969 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | $ (7,067) |
Commercial mortgage-backed securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 41 | 9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 512,312 | $ 144,383
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (9,534) | $ (1,141)
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 | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 512,312 | 144,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (9,534) | $ (1,141)
Held to Maturity |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 36 |
Estimated Fair Value, Less Than 12 Months | $ 556,954 |
Unrealized Losses, Less Than 12 Months | $ (18,472) |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 0 |
Estimated Fair Value, 12 Months or Longer | $ 0 |
Unrealized Losses, 12 Months or Longer | 0 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 556,954 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | $ (18,472) |
Auction rate securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 0 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 118 | 162
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 74,667 | $ 98,206
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (1,683) | (3,304)
Debt Securities, Available-for-sale, Unrealized Loss Position | 74,667 | 98,206
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (1,683) | $ (3,304)

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