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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
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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