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Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment securities, net of allowance $ 2,062,844   $ 2,136,029
Investment Securities, Gross Carrying Value 1,953,706 [1]   2,017,448 [2]
Investment securities, Allowance for Credit Loss (193) [1]   (223) [2]
Investment Securities, Amortized Cost, After Allowance for Credit Loss 2,062,651   2,135,806
Investment Securities, Carrying Value, after Allowance for Credit Loss 1,953,513 [1]   2,017,225 [2]
Investment Securities, Fair Value 1,788,030   1,817,929
Investment Securities, Gross Unrealized Gain 2,377   2,451
Investment Securities, Gross Unrealized Loss (168,053)   $ (201,970)
Debt Securities, Net Unrealized Loss Remaining in AOCI included in Carrying Value for AFS Securities Transferred to Investment Securities $ (109,000) $ (119,000)  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 135   141
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 10,941   $ 14,485
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,694,242   1,711,624
Investment Securities, Continuous Unrealized Loss Position, Fair Value 1,705,183   1,726,109
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 27   65
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 168,026   201,905
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 168,053   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 18,022    
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 90,851    
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 16,045    
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 13    
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 124,931    
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 18,233    
Investment Securities, Debt Maturities, One to Five Years, Fair Value 92,178    
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 14,892    
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 13    
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 125,316    
Investment Securities, Debt Maturities, Weighted Average Maturity [3] 2.63    
Municipal securities [Member]      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment securities, net of allowance $ 92,849   104,467
Investment Securities, Gross Carrying Value 92,849 [1]   104,467 [2]
Investment Securities, Fair Value 94,878   106,489
Investment Securities, Gross Unrealized Gain 2,289   2,370
Investment Securities, Gross Unrealized Loss $ (260)   $ (348)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 14   20
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 10,941   $ 14,485
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 7,500   7,107
Investment Securities, Continuous Unrealized Loss Position, Fair Value 18,441   21,592
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 27   65
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 233   283
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 260   348
Residential agency mortgage-backed securities [Member]      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment securities, net of allowance 1,936,950   1,998,017
Investment Securities, Gross Carrying Value 1,828,775 [1]   1,880,473 [2]
Investment Securities, Fair Value 1,662,714   1,680,800
Investment Securities, Gross Unrealized Gain 88   81
Investment Securities, Gross Unrealized Loss (166,149)   $ (199,754)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value [4] 1,828,775    
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 1,662,714    
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4 years 6 months    
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 116   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 1,661,816   1,679,889
Investment Securities, Continuous Unrealized Loss Position, Fair Value 1,661,816   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 166,149   199,754
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 166,149   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 16,294 [1]   16,220 [2]
Investment Securities, Fair Value 15,653   15,357
Investment Securities, Gross Unrealized Gain 0   0
Investment Securities, Gross Unrealized Loss $ (641)   $ (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 15,653   15,357
Investment Securities, Continuous Unrealized Loss Position, Fair Value 15,653   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 641   863
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 641   863
Other debt securities [Member]      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment securities, net of allowance 15,788   16,288
Investment Securities, Gross Carrying Value 15,788 [1]   16,288 [2]
Investment Securities, Fair Value 14,785   15,283
Investment Securities, Gross Unrealized Gain 0   0
Investment Securities, Gross Unrealized Loss $ (1,003)   $ (1,005)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 3   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 9,273   9,271
Investment Securities, Continuous Unrealized Loss Position, Fair Value 9,273   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 1,003   1,005
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 1,003   $ 1,005
[1] Carrying value includes $109 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 4.5 years based upon current prepayment assumptions.