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Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Gross Amortized Cost $ 2,567,448 $ 2,567,448 $ 2,739,241
Investment Securities, Gross Carrying Value 2,374,536 [1] 2,374,536 [1] 2,514,245 [2]
Investment securities, Allowance for Credit Loss (465) [1] (465) [1] (558) [2]
Investment Securities, Amortized Cost, After Allowance for Credit Loss 2,566,983 2,566,983 2,738,683
Investment Securities, Carrying Value, after Allowance for Credit Loss 2,374,071 [1] 2,374,071 [1] 2,513,687 [2]
Investment Securities, Fair Value 2,185,384 2,185,384 2,346,768
Investment Securities, Gross Unrealized Gain 5,296 5,296 6,611
Investment Securities, Gross Unrealized Loss $ (194,448) (194,448) (174,088)
Debt Securities, Net Unrealized Loss Remaining in AOCI included in Carrying Value for AFS Securities Transferred to Investment Securities   $ (193,000) $ (225,000)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 141 141 143
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 27,513 $ 27,513 $ 2,184,167
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,032,359 2,032,359 801
Investment Securities, Continuous Unrealized Loss Position, Fair Value 2,059,872 2,059,872 2,184,968
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,743 1,743 174,012
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 192,705 192,705 76
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 194,448 194,448 174,088
Fixed Maturity Securities [Member]      
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 26,633 26,633  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 100,361 100,361  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 41,844 41,844  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 13 13  
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 168,851 168,851  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 26,772 26,772  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 104,295 104,295  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 39,877 39,877  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 13 13  
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 170,957 $ 170,957  
Investment Securities, Debt Maturities, Weighted Average Maturity [3] 3.59 3.59  
Municipal securities [Member]      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Gross Amortized Cost $ 136,803 $ 136,803 170,629
Investment Securities, Gross Carrying Value 136,803 [1] 136,803 [1] 170,629 [2]
Investment Securities, Fair Value 141,587 141,587 176,621
Investment Securities, Gross Unrealized Gain 5,168 5,168 6,456
Investment Securities, Gross Unrealized Loss $ (384) $ (384) $ (464)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 20 20 22
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 16,740 $ 16,740 $ 18,037
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 6,484 6,484 544
Investment Securities, Continuous Unrealized Loss Position, Fair Value 23,224 23,224 18,581
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 79 79 406
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 305 305 58
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 384 384 464
Residential agency mortgage-backed securities [Member]      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Gross Amortized Cost 2,397,098 2,397,098 2,538,565
Investment Securities, Gross Carrying Value 2,205,685 [1] 2,205,685 [1] 2,315,219 [2]
Investment Securities, Fair Value 2,014,427 2,014,427 2,143,360
Investment Securities, Gross Unrealized Gain 128 128 155
Investment Securities, Gross Unrealized Loss (191,386) (191,386) $ (172,014)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value [4] 2,205,685 2,205,685  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 2,014,427 $ 2,014,427  
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 $ 2,309 $ 2,309 $ 2,142,114
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,010,981 2,010,981 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value 2,013,290 2,013,290 2,142,114
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 128 128 172,014
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 191,258 191,258 0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 191,386 191,386 172,014
Commercial agency mortgage-backed securities [Member]      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Gross Amortized Cost 17,259 17,259 17,259
Investment Securities, Gross Carrying Value 15,760 [1] 15,760 [1] 15,609 [2]
Investment Securities, Fair Value 14,636 14,636 14,588
Investment Securities, Gross Unrealized Gain 0 0 0
Investment Securities, Gross Unrealized Loss $ (1,124) $ (1,124) $ (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 14,637 14,637 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value 14,637 14,637 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 1,124 1,124 0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 1,124 1,124 1,021
Other debt securities [Member]      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Gross Amortized Cost 16,288 16,288 12,788
Investment Securities, Gross Carrying Value 16,288 [1] 16,288 [1] 12,788 [2]
Investment Securities, Fair Value 14,734 14,734 12,199
Investment Securities, Gross Unrealized Gain 0 0 0
Investment Securities, Gross Unrealized Loss $ (1,554) $ (1,554) $ (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 $ 8,464 $ 8,464 $ 9,428
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 257 257 257
Investment Securities, Continuous Unrealized Loss Position, Fair Value 8,721 8,721 9,685
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,536 1,536 571
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 18 18 18
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 1,554 $ 1,554 $ 589
[1] Carrying value includes $193 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 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.
[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.