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Investment Securities - Unrealized Losses on Securities Available-for-Sale (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]          
Gain (Loss) on Investments $ 0 $ 0 $ 0 $ 0  
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 38,297,000   38,297,000   $ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (114,000)   (114,000)   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,114,167,000   2,114,167,000   2,298,565,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (371,265,000)   (371,265,000)   (352,454,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,152,464,000   2,152,464,000   2,298,565,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (371,379,000)   (371,379,000)   (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 1,101,862,000   1,101,862,000   1,187,609,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (232,132,000)   (232,132,000)   (201,192,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,101,862,000   1,101,862,000   1,187,609,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (232,132,000)   (232,132,000)   (201,192,000)
Agency 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 241,343,000   241,343,000   253,306,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (16,577,000)   (16,577,000)   (15,333,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 241,343,000   241,343,000   253,306,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (16,577,000)   (16,577,000)   (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 278,260,000   278,260,000   265,431,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (34,828,000)   (34,828,000)   (36,650,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 278,260,000   278,260,000   265,431,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (34,828,000)   (34,828,000)   (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 33,057,000   33,057,000   284,334,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,484,000)   (1,484,000)   (1,109,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 33,057,000   33,057,000   284,334,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (1,484,000)   (1,484,000)   (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 278,895,000   278,895,000   19,952,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (46,746,000)   (46,746,000)   (60,254,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 278,895,000   278,895,000   19,952,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (46,746,000)   (46,746,000)   (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 150,286,000   150,286,000   158,412,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (37,430,000)   (37,430,000)   (34,659,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 150,286,000   150,286,000   158,412,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (37,430,000)   (37,430,000)   (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 20,852,000   20,852,000   0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (86,000)   (86,000)   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 20,852,000   20,852,000   66,886,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (86,000)   (86,000)   (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 18,076,000   18,076,000   28,083,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,068,000)   (1,068,000)   (1,313,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 18,076,000   18,076,000   28,083,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (1,068,000)   (1,068,000)   (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 17,445,000   17,445,000   0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (28,000)   (28,000)   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0   0   20,813,000
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 17,445,000   17,445,000   20,813,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (28,000)   (28,000)   (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 12,388,000   12,388,000   13,739,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,000,000)   (1,000,000)   (903,000)
Debt Securities, Available-for-sale, Unrealized Loss Position 12,388,000   12,388,000   13,739,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax $ (1,000,000)   $ (1,000,000)   $ (903,000)