Investment (Held-to-Maturity) Securities (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2024 USD ($)		Dec. 31, 2023 USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Investment securities		$ 2,136,029		$ 2,409,090
Debt Securities, Held-to-Maturity, carrying value		2,017,448	[1]	2,244,489	[2]
Debt Securities, Held-to-maturity, Allowance for Credit Loss		223	[1]	336	[2]
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss		2,135,806		2,408,754
Investment securities		2,017,225	[1]	2,244,153	[2]
Investment Securities, fair value		1,817,929		2,072,586
Investment Securities, Gross Unrealized Gain		2,451		5,139
Investment Securities, Gross Unrealized Loss		(201,970)		(177,042)
Debt Securities, Net Unrealized Loss Remaining in AOCI included in Carrying Value for AFS Securities Transferred to Investment Securities		$ (119,000)		$ (165,000)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		141		134
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 14,485		$ 1,931
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		1,711,624		1,947,071
Investment Securities, Continuous Unrealized Loss Position, Fair Value		1,726,109		1,949,002
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses		65		5
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses		201,905		177,037
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		201,970		177,042
Fixed maturity securities [Member]
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract]
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value		19,306
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value		100,805
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value		16,851
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value		13
Investment Securities, Debt Maturities, Single Maturity Date, Carrying Value		136,975
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Investment Securities, Debt Maturities, Less than One Year, Fair Value		19,350
Investment Securities, Debt Maturities, One to Five Years, Fair Value		102,098
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value		15,668
Investment Securities, Debt Maturities, Over Ten Years, Fair Value		13
Investment Securities, Debt Maturities, Single Maturity Date, Fair value		$ 137,129
Investment Securities, Debt Maturities, Weighted Average Maturity	[3]	2.65
Municipal securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Investment securities		$ 104,467		120,705
Debt Securities, Held-to-Maturity, carrying value		104,467	[1]	120,705	[2]
Investment Securities, fair value		106,489		125,525
Investment Securities, Gross Unrealized Gain		2,370		5,014
Investment Securities, Gross Unrealized Loss		$ (348)		$ (194)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		20		13
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 14,485		$ 1,931
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		7,107		6,600
Investment Securities, Continuous Unrealized Loss Position, Fair Value		21,592		8,531
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses		65		5
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses		283		189
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		348		194
Residential agency mortgage-backed securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Investment securities		1,998,017		2,255,340
Debt Securities, Held-to-Maturity, carrying value		1,880,473	[1]	2,092,083	[2]
Investment Securities, fair value		1,680,800		1,917,810
Investment Securities, Gross Unrealized Gain		81		125
Investment Securities, Gross Unrealized Loss		(199,754)		$ (174,398)
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract]
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying value	[4]	1,880,473
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Investment Securities, Debt Maturities, without Single Maturity Date, Fair value		$ 1,680,800
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities		4 years 8 months 12 days
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		1,679,889		1,916,732
Investment Securities, Continuous Unrealized Loss Position, Fair Value		1,679,889		1,916,732
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses		0		0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses		199,754		174,398
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		199,754		174,398
Commercial agency mortgage-backed securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Investment securities		17,257		17,258
Debt Securities, Held-to-Maturity, carrying value		16,220	[1]	15,914	[2]
Investment Securities, fair value		15,357		15,067
Investment Securities, Gross Unrealized Gain		0		0
Investment Securities, Gross Unrealized Loss		$ (863)		$ (847)
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		15,357		15,067
Investment Securities, Continuous Unrealized Loss Position, Fair Value		15,357		15,067
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses		0		0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses		863		847
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		863		847
Other debt securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Investment securities		16,288		15,787
Debt Securities, Held-to-Maturity, carrying value		16,288	[1]	15,787	[2]
Investment Securities, fair value		15,283		14,184
Investment Securities, Gross Unrealized Gain		0		0
Investment Securities, Gross Unrealized Loss		$ (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
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		9,271		8,672
Investment Securities, Continuous Unrealized Loss Position, Fair Value		9,271		8,672
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses		0		0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses		1,005		1,603
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ 1,005		$ 1,603

[1] 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 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 4.7 years based upon current prepayment assumptions.