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Securities - Summary of Gross Unrealized Losses and Fair Values, Aggregated by Investment Category and Length of Individual Securities Continuous Unrealized Loss Position Available-for-sale (Details) $ in Thousands | Mar. 31, 2022 USD ($) Security | Dec. 31, 2021 USD ($) Security
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Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 223 | 104
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 621,029 | $ 880,643
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (32,092) | (18,857)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 632,263 | 82,459
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses | (65,079) | (3,575)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 1,253,292 | 963,102
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (97,171) | $ (22,432)
U.S. treasury notes |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 4 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 22,223 | $ 9,946
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (654) | (8)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 22,223 | 9,946
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (654) | $ (8)
U.S. Government Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 15 | 10
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 43,883 | $ 64,585
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (1,915) | (1,590)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 74,242 | 19,223
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses | (7,337) | (777)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 118,125 | 83,808
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (9,252) | $ (2,367)
Obligations of States, Municipalities, and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 25 | 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 42,934 | $ 9,507
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (2,170) | (56)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 42,934 | 9,507
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (2,170) | $ (56)
Agency, Residential Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 93 | 51
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 229,246 | $ 612,280
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (11,442) | (13,894)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 469,295 | 25,412
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses | (45,901) | (1,121)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 698,541 | 637,692
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (57,343) | $ (15,015)
Non-Agency, Residential Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 19 | 14
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 110,832 | $ 96,372
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (7,854) | (1,257)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 19,592 | 761
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses | (2,072) | (10)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 130,424 | 97,133
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (9,926) | $ (1,267)
Agency, Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 45 | 19
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 111,241 | $ 64,473
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (6,766) | (1,994)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 69,134 | 37,063
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses | (9,769) | (1,667)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 180,375 | 101,536
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (16,535) | $ (3,661)
Corporate Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 16 | 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 28,709 | $ 7,502
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (1,144) | (54)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 28,709 | 7,502
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (1,144) | $ (54)
Asset-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 6 | 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 31,961 | $ 15,978
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (147) | (4)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 31,961 | 15,978
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (147) | $ (4)

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