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Investment Securities - Unrealized Losses on Securities Available-for-Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 1,057,030 $ 5,102,495
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (101,408) (63,559)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3,777,773 322,496
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (709,728) (8,536)
Debt Securities, Available-for-sale, Unrealized Loss Position 4,834,803 5,424,991
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (811,136) (72,095)
Residential Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 52,556 2,502,536
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (6,193) (31,670)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,189,485 57,329
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (436,803) (979)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,242,041 2,559,865
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (442,996) (32,649)
US Treasury Securities [Member]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 4,972 628,767
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (26) (8,298)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 665,098 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (101,049) 0
Debt Securities, Available-for-sale, Unrealized Loss Position 670,070 628,767
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (101,075) (8,298)
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 316,892 440,938
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (31,139) (5,066)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 170,714 106,745
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (30,747) (4,147)
Debt Securities, Available-for-sale, Unrealized Loss Position 487,606 547,683
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (61,886) (9,213)
Government agency and government-sponsored enterprise collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 245,755 216,445
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (22,748) (3,757)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 211,309 67,340
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (37,363) (2,113)
Debt Securities, Available-for-sale, Unrealized Loss Position 457,064 283,785
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (60,111) (5,870)
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 37,380 505,080
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3,129) (6,965)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 298,266 29,726
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (57,269) (1,008)
Debt Securities, Available-for-sale, Unrealized Loss Position 335,646 534,806
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (60,398) (7,973)
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 302,643 32,761
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (32,124) (757)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 4,256 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (744) 0
Debt Securities, Available-for-sale, Unrealized Loss Position 306,899 32,761
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (32,868) (757)
Private Label Collateralized Mortgage Obligations [Member]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 19,261 201,988
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,294) (3,291)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 147,464 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (39,105) 0
Debt Securities, Available-for-sale, Unrealized Loss Position 166,725 201,988
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (40,399) (3,291)
Collateralized Loan Obligations [Member]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 27,704 137,619
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,818) (374)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 74,558 43,730
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (5,080) (70)
Debt Securities, Available-for-sale, Unrealized Loss Position 102,262 181,349
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (6,898) (444)
Mortgage-backed Securities, Issued by Private Enterprises    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 10,204 397,619
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (508) (3,244)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 16,623 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,568) 0
Debt Securities, Available-for-sale, Unrealized Loss Position 26,827 397,619
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (2,076) (3,244)
Asset-backed Securities [Member]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 22,413 38,742
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,155) (137)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 15,762
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (187)
Debt Securities, Available-for-sale, Unrealized Loss Position 22,413 54,504
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (1,155) (324)
SBA asset-backed securities [Member]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 17,250 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,274) 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 1,864
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (32)
Debt Securities, Available-for-sale, Unrealized Loss Position 17,250 1,864
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (1,274) $ (32)