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Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Gross Amortized Cost $ 2,269,560 $ 2,269,560 $ 2,409,090
Investment Securities, Gross Carrying Value 2,129,168 [1] 2,129,168 [1] 2,244,489 [2]
Investment securities, Allowance for Credit Loss (287) [1] (287) [1] (336) [2]
Investment Securities, Amortized Cost, After Allowance for Credit Loss 2,269,273 2,269,273 2,408,754
Investment Securities, Carrying Value, after Allowance for Credit Loss 2,128,881 [1] 2,128,881 [1] 2,244,153 [2]
Investment Securities, Fair Value 1,924,532 1,924,532 2,072,586
Investment Securities, Gross Unrealized Gain 3,067 3,067 5,139
Investment Securities, Gross Unrealized Loss $ (207,703) (207,703) (177,042)
Debt Securities, Net Unrealized Loss Remaining in AOCI included in Carrying Value for AFS Securities Transferred to Investment Securities   $ (140,000) $ (165,000)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 146 146 134
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 16,795 $ 16,795 $ 1,931
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,816,520 1,816,520 1,947,071
Investment Securities, Continuous Unrealized Loss Position, Fair Value 1,833,315 1,833,315 1,949,002
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 150 150 5
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 207,553 207,553 177,037
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 207,703 207,703 177,042
Fixed Maturity Securities [Member]      
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 18,247 18,247  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 101,521 101,521  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 18,761 18,761  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 13 13  
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 138,542 138,542  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 18,397 18,397  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 102,988 102,988  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 17,038 17,038  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 13 13  
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 138,436 $ 138,436  
Investment Securities, Debt Maturities, Weighted Average Maturity [3] 3.10 3.10  
Municipal securities [Member]      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Gross Amortized Cost $ 107,188 $ 107,188 120,705
Investment Securities, Gross Carrying Value 107,188 [1] 107,188 [1] 120,705 [2]
Investment Securities, Fair Value 109,700 109,700 125,525
Investment Securities, Gross Unrealized Gain 2,976 2,976 5,014
Investment Securities, Gross Unrealized Loss $ (464) $ (464) $ (194)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 25 25 13
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 16,795 $ 16,795 $ 1,931
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 7,679 7,679 6,600
Investment Securities, Continuous Unrealized Loss Position, Fair Value 24,474 24,474 8,531
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 150 150 5
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 314 314 189
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 464 464 194
Residential agency mortgage-backed securities [Member]      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Gross Amortized Cost 2,129,826 2,129,826 2,255,340
Investment Securities, Gross Carrying Value 1,990,626 [1] 1,990,626 [1] 2,092,083 [2]
Investment Securities, Fair Value 1,786,096 1,786,096 1,917,810
Investment Securities, Gross Unrealized Gain 91 91 125
Investment Securities, Gross Unrealized Loss (204,621) (204,621) $ (174,398)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value [4] 1,990,626 1,990,626  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 1,786,096 $ 1,786,096  
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4 years 10 months 24 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 1,785,118 1,785,118 1,916,732
Investment Securities, Continuous Unrealized Loss Position, Fair Value 1,785,118 1,785,118 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 204,621 204,621 174,398
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 204,621 204,621 174,398
Commercial agency mortgage-backed securities [Member]      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Gross Amortized Cost 17,258 17,258 17,258
Investment Securities, Gross Carrying Value 16,066 [1] 16,066 [1] 15,914 [2]
Investment Securities, Fair Value 15,030 15,030 15,067
Investment Securities, Gross Unrealized Gain 0 0 0
Investment Securities, Gross Unrealized Loss $ (1,036) $ (1,036) $ (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 15,030 15,030 15,067
Investment Securities, Continuous Unrealized Loss Position, Fair Value 15,030 15,030 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 1,036 1,036 847
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 1,036 1,036 847
Other debt securities [Member]      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Gross Amortized Cost 15,288 15,288 15,787
Investment Securities, Gross Carrying Value 15,288 [1] 15,288 [1] 15,787 [2]
Investment Securities, Fair Value 13,706 13,706 14,184
Investment Securities, Gross Unrealized Gain 0 0 0
Investment Securities, Gross Unrealized Loss $ (1,582) $ (1,582) $ (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 8,693 8,693 8,672
Investment Securities, Continuous Unrealized Loss Position, Fair Value 8,693 8,693 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 1,582 1,582 1,603
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 1,582 $ 1,582 $ 1,603
[1] Carrying value includes $140 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 4.9 years based upon current prepayment assumptions.