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Investment Securities - Unrealized Losses on Securities Available-for-Sale (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]            
Gain (Loss) on Investments $ (59,946,000) $ 0 $ 0 $ (59,946,000) $ 0  
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 110,996,000     110,996,000   $ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (218,000)     (218,000)   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,448,667,000     1,448,667,000   2,298,565,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (230,456,000)     (230,456,000)   (352,454,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,559,663,000     1,559,663,000   2,298,565,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (230,674,000)     (230,674,000)   (352,454,000)
Agency residential MBS            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0     0   0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0     0   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 922,448,000     922,448,000   1,187,609,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (148,706,000)     (148,706,000)   (201,192,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 922,448,000     922,448,000   1,187,609,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (148,706,000)     (148,706,000)   (201,192,000)
Agency commercial MBS (1)            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 21,289,000     21,289,000   0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0     0   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 12,243,000     12,243,000   253,306,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (661,000)     (661,000)   (15,333,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 33,532,000     33,532,000   253,306,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (661,000)     (661,000)   (15,333,000)
Agency residential CMOs            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0     0   0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0     0   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 109,796,000     109,796,000   284,334,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (15,853,000)     (15,853,000)   (36,650,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 109,796,000     109,796,000   284,334,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (15,853,000)     (15,853,000)   (36,650,000)
Municipal securities            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0     0   0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0     0   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 597,000     597,000   28,083,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (5,000)     (5,000)   (1,109,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 597,000     597,000   28,083,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (5,000)     (5,000)   (1,109,000)
Corporate Debt Securities            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0     0   0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0     0   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 247,200,000     247,200,000   265,431,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (35,920,000)     (35,920,000)   (60,254,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 247,200,000     247,200,000   265,431,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (35,920,000)     (35,920,000)   (60,254,000)
Private Label Collateralized Mortgage Obligations            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0     0   0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0     0   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 138,448,000     138,448,000   158,412,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (28,266,000)     (28,266,000)   (34,659,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 138,448,000     138,448,000   158,412,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (28,266,000)     (28,266,000)   (34,659,000)
Collateralized loan obligations            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 73,503,000     73,503,000   0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (135,000)     (135,000)   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0     0   66,886,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0     0   (752,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 73,503,000     73,503,000   66,886,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (135,000)     (135,000)   (752,000)
Private label commercial MBS            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0     0   0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0     0   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 13,622,000     13,622,000   20,813,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (793,000)     (793,000)   (1,313,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 13,622,000     13,622,000   20,813,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (793,000)     (793,000)   (1,313,000)
Asset-backed Securities            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 16,204,000     16,204,000   0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (83,000)     (83,000)   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0     0   19,952,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0     0   (289,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 16,204,000     16,204,000   19,952,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (83,000)     (83,000)   (289,000)
SBA securities            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0     0   0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0     0   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 4,313,000     4,313,000   13,739,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (252,000)     (252,000)   (903,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 4,313,000     4,313,000   13,739,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax $ (252,000)     $ (252,000)   $ (903,000)