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Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Gross Amortized Cost $ 2,476,759 $ 2,476,759 $ 2,739,241
Investment Securities, Gross Carrying Value 2,298,762 [1] 2,298,762 [1] 2,514,245 [2]
Investment securities, Allowance for Credit Loss (344) [1] (344) [1] (558) [2]
Investment Securities, Amortized Cost, After Allowance for Credit Loss 2,476,415 2,476,415 2,738,683
Investment Securities, Carrying Value, after Allowance for Credit Loss 2,298,418 [1] 2,298,418 [1] 2,513,687 [2]
Investment Securities, Fair Value 2,052,367 2,052,367 2,346,768
Investment Securities, Gross Unrealized Gain 2,977 2,977 6,611
Investment Securities, Gross Unrealized Loss $ (249,372) (249,372) (174,088)
Debt Securities, Net Unrealized Loss Remaining in AOCI included in Carrying Value for AFS Securities Transferred to Investment Securities   $ (178,000) $ (225,000)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 180 180 143
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 28,962 $ 28,962 $ 2,184,167
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,929,282 1,929,282 801
Investment Securities, Continuous Unrealized Loss Position, Fair Value 1,958,244 1,958,244 2,184,968
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 601 601 174,012
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 248,771 248,771 76
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 249,372 249,372 174,088
Fixed Maturity Securities [Member]      
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 17,756 17,756  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 100,534 100,534  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 34,326 34,326  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 13 13  
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 152,629 152,629  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 17,804 17,804  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 102,168 102,168  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 31,239 31,239  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 13 13  
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 151,224 $ 151,224  
Investment Securities, Debt Maturities, Weighted Average Maturity [3] 3.53 3.53  
Municipal securities [Member]      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Gross Amortized Cost $ 121,003 $ 121,003 170,629
Investment Securities, Gross Carrying Value 121,003 [1] 121,003 [1] 170,629 [2]
Investment Securities, Fair Value 122,695 122,695 176,621
Investment Securities, Gross Unrealized Gain 2,882 2,882 6,456
Investment Securities, Gross Unrealized Loss $ (1,190) $ (1,190) $ (464)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 59 59 22
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 28,962 $ 28,962 $ 18,037
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 6,200 6,200 544
Investment Securities, Continuous Unrealized Loss Position, Fair Value 35,162 35,162 18,581
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 601 601 406
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 589 589 58
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 1,190 1,190 464
Residential agency mortgage-backed securities [Member]      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Gross Amortized Cost 2,322,710 2,322,710 2,538,565
Investment Securities, Gross Carrying Value 2,146,133 [1] 2,146,133 [1] 2,315,219 [2]
Investment Securities, Fair Value 1,901,143 1,901,143 2,143,360
Investment Securities, Gross Unrealized Gain 95 95 155
Investment Securities, Gross Unrealized Loss (245,085) (245,085) $ (172,014)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value [4] 2,146,133 2,146,133  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 1,901,143 $ 1,901,143  
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 5 years 3 months 18 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 $ 2,142,114
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,900,066 1,900,066 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value 1,900,066 1,900,066 2,142,114
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0 172,014
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 245,085 245,085 0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 245,085 245,085 172,014
Commercial agency mortgage-backed securities [Member]      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Gross Amortized Cost 17,258 17,258 17,259
Investment Securities, Gross Carrying Value 15,838 [1] 15,838 [1] 15,609 [2]
Investment Securities, Fair Value 14,371 14,371 14,588
Investment Securities, Gross Unrealized Gain 0 0 0
Investment Securities, Gross Unrealized Loss $ (1,467) $ (1,467) $ (1,021)
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 $ 14,588
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 14,371 14,371 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value 14,371 14,371 14,588
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0 1,021
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,467 1,467 0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 1,467 1,467 1,021
Other debt securities [Member]      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Gross Amortized Cost 15,788 15,788 12,788
Investment Securities, Gross Carrying Value 15,788 [1] 15,788 [1] 12,788 [2]
Investment Securities, Fair Value 14,158 14,158 12,199
Investment Securities, Gross Unrealized Gain 0 0 0
Investment Securities, Gross Unrealized Loss $ (1,630) $ (1,630) $ (589)
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 $ 9,428
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 8,645 8,645 257
Investment Securities, Continuous Unrealized Loss Position, Fair Value 8,645 8,645 9,685
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0 571
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,630 1,630 18
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 1,630 $ 1,630 $ 589
[1] Carrying value includes $178 million of net unrealized loss which remains in Accumulated other comprehensive income ("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 $225 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 5.3 years based upon current prepayment assumptions.