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Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
 3 Months Ended
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities, net of allowance $ 1,929,155 $ 2,136,029
Investment Securities, Gross Carrying Value 1,837,855 [1] 2,017,448 [2]
Investment securities, Allowance for Credit Loss (208) [1] (223) [2]
Investment Securities, Amortized Cost, After Allowance for Credit Loss 1,928,947 2,135,806
Investment Securities, Carrying Value, after Allowance for Credit Loss 1,837,647 [1] 2,017,225 [2]
Investment Securities, Fair Value 1,702,225 1,817,929
Investment Securities, Gross Unrealized Gain 1,924 2,451
Investment Securities, Gross Unrealized Loss (137,554) (201,970)
Debt Securities, Net Unrealized Loss Remaining in AOCI included in Carrying Value for AFS Securities Transferred to Investment Securities $ (91,000) $ (119,000)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 124 141
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 $ 14,485
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,608,940 1,711,624
Investment Securities, Continuous Unrealized Loss Position, Fair Value 1,608,940 1,726,109
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 65
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 137,554 201,905
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 137,554 201,970
Fixed Maturity Securities [Member]    
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 47,685  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 58,873  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 13,933  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 13  
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 120,504  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 48,723  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 59,162  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 13,167  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 13  
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 121,065  
Investment Securities, Debt Maturities, Weighted Average Maturity [3] 2.25  
Municipal securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities, net of allowance $ 88,525 104,467
Investment Securities, Gross Carrying Value 88,525 [1] 104,467 [2]
Investment Securities, Fair Value 90,285 106,489
Investment Securities, Gross Unrealized Gain 1,831 2,370
Investment Securities, Gross Unrealized Loss $ (71) $ (348)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 5 20
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 $ 14,485
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,625 7,107
Investment Securities, Continuous Unrealized Loss Position, Fair Value 3,625 21,592
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 65
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 71 283
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 71 348
Residential agency mortgage-backed securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities, net of allowance 1,807,835 1,998,017
Investment Securities, Gross Carrying Value 1,717,351 [1] 1,880,473 [2]
Investment Securities, Fair Value 1,581,160 1,680,800
Investment Securities, Gross Unrealized Gain 93 81
Investment Securities, Gross Unrealized Loss (136,284) $ (199,754)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value [4] 1,717,351  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 1,581,160  
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4 years 4 months 24 days  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 115 116
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 $ 0
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,580,047 1,679,889
Investment Securities, Continuous Unrealized Loss Position, Fair Value 1,580,047 1,679,889
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 136,284 199,754
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 136,284 199,754
Commercial agency mortgage-backed securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities, net of allowance 17,257 17,257
Investment Securities, Gross Carrying Value 16,441 [1] 16,220 [2]
Investment Securities, Fair Value 16,023 15,357
Investment Securities, Gross Unrealized Gain 0 0
Investment Securities, Gross Unrealized Loss $ (418) $ (863)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 2 2
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 $ 0
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 16,023 15,357
Investment Securities, Continuous Unrealized Loss Position, Fair Value 16,023 15,357
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 418 863
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 418 863
Other debt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities, net of allowance 15,538 16,288
Investment Securities, Gross Carrying Value 15,538 [1] 16,288 [2]
Investment Securities, Fair Value 14,757 15,283
Investment Securities, Gross Unrealized Gain 0 0
Investment Securities, Gross Unrealized Loss $ (781) $ (1,005)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 2 3
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 $ 0
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 9,245 9,271
Investment Securities, Continuous Unrealized Loss Position, Fair Value 9,245 9,271
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 781 1,005
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 781 $ 1,005
[1] Carrying value includes $91 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the AFS securities portfolio to the investment securities portfolio.
[2] Carrying value includes $119 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the AFS securities portfolio to the investment securities portfolio.
[3] Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.
[4] The average expected lives of residential mortgage-backed securities were 4.4 years based upon current prepayment assumptions.