v3.26.1
Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
 3 Months Ended
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities, net of allowance $ 1,695,895 $ 1,867,725
Investment Securities, Gross Carrying Value 1,627,358 [1] 1,784,444 [2]
Investment securities, Allowance for Credit Loss (77) [1] (202) [2]
Investment Securities, Amortized Cost, After Allowance for Credit Loss 1,695,818 1,867,523
Investment Securities 1,627,281 [1] 1,784,242 [2]
Investment Securities, Fair Value 1,483,006 1,662,005
Investment Securities, Gross Unrealized Gain 572 1,309
Investment Securities, Gross Unrealized Loss (144,924) (123,748)
Debt Securities, Net Unrealized Loss Remaining in AOCI included in Carrying Value for AFS Securities Transferred to Investment Securities $ (69,000) $ (83,000)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 123 127
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 1,413 $ 6,566
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,441,436 1,569,689
Investment Securities, Continuous Unrealized Loss Position, Fair Value 1,442,849 1,576,255
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 32 8
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 144,892 123,740
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 144,924 123,748
Fixed Maturity Securities [Member]    
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 15,047  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 42,433  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 11,551  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 0  
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 69,031  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 15,149  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 42,315  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 10,877  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 0  
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 68,341  
Investment Securities, Debt Maturities, Weighted Average Maturity [3] 2.52  
Municipal securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities, net of allowance $ 36,856 88,215
Investment Securities, Gross Carrying Value 36,856 [1] 88,215 [2]
Investment Securities, Fair Value 37,304 89,343
Investment Securities, Gross Unrealized Gain 512 1,218
Investment Securities, Gross Unrealized Loss $ (64) $ (90)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 5 8
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 $ 6,566
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,631 3,613
Investment Securities, Continuous Unrealized Loss Position, Fair Value 3,631 10,179
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 8
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 64 82
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 64 90
Residential agency mortgage-backed securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities, net of allowance 1,626,268 1,746,715
Investment Securities, Gross Carrying Value 1,558,327 [1] 1,664,175 [2]
Investment Securities, Fair Value 1,414,665 1,541,608
Investment Securities, Gross Unrealized Gain 60 91
Investment Securities, Gross Unrealized Loss (143,722) $ (122,658)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value [4] 1,558,327  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 1,414,665  
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4 years 2 months 12 days  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 115 115
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 1,413 $ 0
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,412,281 1,540,535
Investment Securities, Continuous Unrealized Loss Position, Fair Value 1,413,694 1,540,535
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 32 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 143,690 122,658
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 143,722 122,658
Commercial agency mortgage-backed securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities, net of allowance 17,258 17,257
Investment Securities, Gross Carrying Value 16,662 [1] 16,516 [2]
Investment Securities, Fair Value 16,189 16,186
Investment Securities, Gross Unrealized Gain 0 0
Investment Securities, Gross Unrealized Loss $ (473) $ (330)
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 16,189 16,186
Investment Securities, Continuous Unrealized Loss Position, Fair Value 16,189 16,186
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 473 330
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 473 330
Other debt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities, net of allowance 15,513 15,538
Investment Securities, Gross Carrying Value 15,513 [1] 15,538 [2]
Investment Securities, Fair Value 14,848 14,868
Investment Securities, Gross Unrealized Gain 0 0
Investment Securities, Gross Unrealized Loss $ (665) $ (670)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1 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 9,335 9,355
Investment Securities, Continuous Unrealized Loss Position, Fair Value 9,335 9,355
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 665 670
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 665 $ 670
[1] Carrying value includes $69 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 $83 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 4.2 years based upon current prepayment assumptions.