v3.26.1
Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities, net of allowance $ 1,795,827 $ 1,867,725
Investment Securities, Gross Carrying Value 1,719,922 [1] 1,784,444 [2]
Investment securities, Allowance for Credit Loss (191) [1] (202) [2]
Investment Securities, Amortized Cost, After Allowance for Credit Loss 1,795,636 1,867,523
Investment Securities 1,719,731 [1] 1,784,242 [2]
Investment Securities, Fair Value 1,585,890 1,662,005
Investment Securities, Gross Unrealized Gain 1,255 1,309
Investment Securities, Gross Unrealized Loss (135,287) (123,748)
Debt Securities, Net Unrealized Loss Remaining in AOCI included in Carrying Value for AFS Securities Transferred to Investment Securities $ (76,000) $ (83,000)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 125 127
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 3,042 $ 6,566
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,506,538 1,569,689
Investment Securities, Continuous Unrealized Loss Position, Fair Value 1,509,580 1,576,255
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 31 8
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 135,256 123,740
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 135,287 123,748
Fixed Maturity Securities [Member]    
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 44,448  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 48,389  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 13,098  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 0  
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 105,935  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 45,183  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 48,395  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 12,328  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 0  
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 105,906  
Investment Securities, Debt Maturities, Weighted Average Maturity [3] 1.98  
Municipal securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities, net of allowance $ 73,334 88,215
Investment Securities, Gross Carrying Value 73,334 [1] 88,215 [2]
Investment Securities, Fair Value 74,429 89,343
Investment Securities, Gross Unrealized Gain 1,183 1,218
Investment Securities, Gross Unrealized Loss $ (88) $ (90)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 7 8
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 1,541 $ 6,566
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,613 3,613
Investment Securities, Continuous Unrealized Loss Position, Fair Value 5,154 10,179
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 5 8
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 83 82
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 88 90
Residential agency mortgage-backed securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities, net of allowance 1,689,222 1,746,715
Investment Securities, Gross Carrying Value 1,613,987 [1] 1,664,175 [2]
Investment Securities, Fair Value 1,479,984 1,541,608
Investment Securities, Gross Unrealized Gain 72 91
Investment Securities, Gross Unrealized Loss (134,075) $ (122,658)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value [4] 1,613,987  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 1,479,984  
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 $ 1,501 $ 0
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,477,461 1,540,535
Investment Securities, Continuous Unrealized Loss Position, Fair Value 1,478,962 1,540,535
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 26 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 134,049 122,658
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 134,075 122,658
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 16,588 [1] 16,516 [2]
Investment Securities, Fair Value 16,190 16,186
Investment Securities, Gross Unrealized Gain 0 0
Investment Securities, Gross Unrealized Loss $ (398) $ (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 16,190 16,186
Investment Securities, Continuous Unrealized Loss Position, Fair Value 16,190 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 398 330
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 398 330
Other debt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities, net of allowance 16,013 15,538
Investment Securities, Gross Carrying Value 16,013 [1] 15,538 [2]
Investment Securities, Fair Value 15,287 14,868
Investment Securities, Gross Unrealized Gain 0 0
Investment Securities, Gross Unrealized Loss $ (726) $ (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 9,274 9,355
Investment Securities, Continuous Unrealized Loss Position, Fair Value 9,274 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 726 670
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 726 $ 670
[1] Carrying value includes $76 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.