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Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]        
Investment Securities, Gross Amortized Cost $ 2,199,059 $ 2,199,059 $ 2,409,090  
Investment Securities, Gross Carrying Value 2,070,099 [1] 2,070,099 [1] 2,244,489 [2]  
Investment securities, Allowance for Credit Loss (234) [1] (234) [1] (336) [2]  
Investment Securities, Amortized Cost, After Allowance for Credit Loss 2,198,825 2,198,825 2,408,754  
Investment Securities, Carrying Value, after Allowance for Credit Loss 2,069,865 [1] 2,069,865 [1] 2,244,153 [2]  
Investment Securities, Fair Value 1,937,907 1,937,907 2,072,586 $ 2,072,586
Investment Securities, Gross Unrealized Gain 3,769 3,769 5,139  
Investment Securities, Gross Unrealized Loss $ (135,961) (135,961) (177,042)  
Debt Securities, Net Unrealized Loss Remaining in AOCI included in Carrying Value for AFS Securities Transferred to Investment Securities   $ (129,000) $ (165,000)  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 134 134 134  
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 2,826 $ 2,826 $ 1,931  
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,830,387 1,830,387 1,947,071  
Investment Securities, Continuous Unrealized Loss Position, Fair Value 1,833,213 1,833,213 1,949,002  
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 8 8 5  
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 135,953 135,953 177,037  
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 135,961 135,961 177,042  
Fixed Maturity Securities [Member]        
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]        
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 18,305 18,305    
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 101,272 101,272    
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 17,116 17,116    
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 13 13    
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 136,706 136,706    
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]        
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 18,429 18,429    
Investment Securities, Debt Maturities, One to Five Years, Fair Value 104,089 104,089    
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 16,068 16,068    
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 13 13    
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 138,599 $ 138,599    
Investment Securities, Debt Maturities, Weighted Average Maturity [3] 2.90 2.90    
Municipal securities [Member]        
Schedule of Investment (Held-to-Maturity) Securities [Line Items]        
Investment Securities, Gross Amortized Cost $ 104,775 $ 104,775 120,705  
Investment Securities, Gross Carrying Value 104,775 [1] 104,775 [1] 120,705 [2]  
Investment Securities, Fair Value 108,213 108,213 125,525  
Investment Securities, Gross Unrealized Gain 3,657 3,657 5,014  
Investment Securities, Gross Unrealized Loss $ (219) $ (219) $ (194)  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 13 13 13  
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 2,826 $ 2,826 $ 1,931  
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 7,180 7,180 6,600  
Investment Securities, Continuous Unrealized Loss Position, Fair Value 10,006 10,006 8,531  
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 8 8 5  
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 211 211 189  
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 219 219 194  
Residential agency mortgage-backed securities [Member]        
Schedule of Investment (Held-to-Maturity) Securities [Line Items]        
Investment Securities, Gross Amortized Cost 2,061,239 2,061,239 2,255,340  
Investment Securities, Gross Carrying Value 1,933,393 [1] 1,933,393 [1] 2,092,083 [2]  
Investment Securities, Fair Value 1,799,308 1,799,308 1,917,810  
Investment Securities, Gross Unrealized Gain 112 112 125  
Investment Securities, Gross Unrealized Loss (134,197) (134,197) $ (174,398)  
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]        
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value [4] 1,933,393 1,933,393    
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]        
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 1,799,308 $ 1,799,308    
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4 years 7 months 6 days      
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 116 116 116  
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 $ 0 $ 0  
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,798,334 1,798,334 1,916,732  
Investment Securities, Continuous Unrealized Loss Position, Fair Value 1,798,334 1,798,334 1,916,732  
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0 0  
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 134,197 134,197 174,398  
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 134,197 134,197 174,398  
Commercial agency mortgage-backed securities [Member]        
Schedule of Investment (Held-to-Maturity) Securities [Line Items]        
Investment Securities, Gross Amortized Cost 17,257 17,257 17,258  
Investment Securities, Gross Carrying Value 16,143 [1] 16,143 [1] 15,914 [2]  
Investment Securities, Fair Value 15,603 15,603 15,067  
Investment Securities, Gross Unrealized Gain 0 0 0  
Investment Securities, Gross Unrealized Loss $ (540) $ (540) $ (847)  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 2 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 $ 0  
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 15,603 15,603 15,067  
Investment Securities, Continuous Unrealized Loss Position, Fair Value 15,603 15,603 15,067  
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0 0  
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 540 540 847  
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 540 540 847  
Other debt securities [Member]        
Schedule of Investment (Held-to-Maturity) Securities [Line Items]        
Investment Securities, Gross Amortized Cost 15,788 15,788 15,787  
Investment Securities, Gross Carrying Value 15,788 [1] 15,788 [1] 15,787 [2]  
Investment Securities, Fair Value 14,783 14,783 14,184  
Investment Securities, Gross Unrealized Gain 0 0 0  
Investment Securities, Gross Unrealized Loss $ (1,005) $ (1,005) $ (1,603)  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 3 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 $ 0  
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 9,270 9,270 8,672  
Investment Securities, Continuous Unrealized Loss Position, Fair Value 9,270 9,270 8,672  
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0 0  
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,005 1,005 1,603  
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 1,005 $ 1,005 $ 1,603  
[1] Carrying value includes $129 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 Available-for-sale securities portfolio to the investment securities portfolio.
[2] Carrying value includes $165 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 Available-for-sale 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 4.6 years based upon current prepayment assumptions.