Investment (Held-to-Maturity) Securities (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Debt Securities, Held-to-maturity, gross		$ 2,739,241	$ 210,999
Debt Securities, Held-to-Maturity, carrying value		2,514,245	210,999
Debt Securities, Held-to-maturity, Allowance for Credit Loss		558	555
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss		2,738,683	210,444
Debt Securities, Held-to-Maturity, Carrying Value, after Allowance for Credit Loss		2,513,687	210,444
Investment Securities, fair value		2,346,768	231,395
Investment Securities, Gross Unrealized Gain		6,611	20,412
Investment Securities, Gross Unrealized Loss		(174,088)	$ (16)
Debt Securities, Net Unrealized Loss Remaining in AOCI included in Carrying Value for AFS Securities Transferred to Investment Securities		$ (225,000)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		143	3
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 2,184,167	$ 273
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		801	587
Investment Securities, Continuous Unrealized Loss Position, Fair Value		2,184,968	860
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses		174,012	2
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses		76	14
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		174,088	16
Fixed maturity securities [Member]
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract]
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value		23,329
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value		103,089
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value		67,660
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value		4,948
Investment Securities, Debt Maturities, Single Maturity Date, Carrying Value		199,026
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Investment Securities, Debt Maturities, Less than One Year, Fair Value		23,440
Investment Securities, Debt Maturities, One to Five Years, Fair Value		109,073
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value		65,947
Investment Securities, Debt Maturities, Over Ten Years, Fair Value		4,948
Investment Securities, Debt Maturities, Single Maturity Date, Fair value		$ 203,408
Investment Securities, Debt Maturities, Weighted Average Maturity	[1]	4.33
Municipal securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Debt Securities, Held-to-maturity, gross		$ 170,629	203,772
Debt Securities, Held-to-Maturity, carrying value		170,629	203,772
Investment Securities, fair value		176,621	223,609
Investment Securities, Gross Unrealized Gain		6,456	19,851
Investment Securities, Gross Unrealized Loss		$ (464)	$ (14)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		22	1
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 18,037	$ 0
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		544	587
Investment Securities, Continuous Unrealized Loss Position, Fair Value		18,581	587
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses		406	0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses		58	14
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		464	14
Residential agency mortgage-backed securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Debt Securities, Held-to-maturity, gross		2,538,565	6,939
Debt Securities, Held-to-Maturity, carrying value		2,315,219	6,939
Investment Securities, fair value		2,143,360	7,500
Investment Securities, Gross Unrealized Gain		155	561
Investment Securities, Gross Unrealized Loss		(172,014)	0
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract]
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying value	[2]	2,315,219
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Investment Securities, Debt Maturities, without Single Maturity Date, Fair value		$ 2,143,360
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities		5 years 4 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
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 2,142,114
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0
Investment Securities, Continuous Unrealized Loss Position, Fair Value		2,142,114
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses		172,014
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses		0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		172,014
Commercial agency mortgage-backed securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Debt Securities, Held-to-maturity, gross		17,259
Debt Securities, Held-to-Maturity, carrying value		15,609
Investment Securities, fair value		14,588
Investment Securities, Gross Unrealized Gain		0
Investment Securities, Gross Unrealized Loss		$ (1,021)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		2
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 14,588
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0
Investment Securities, Continuous Unrealized Loss Position, Fair Value		14,588
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses		1,021
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses		0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		1,021
Other debt securities [Member]
Schedule of Investment (Held-to-Maturity) Securities [Line Items]
Debt Securities, Held-to-maturity, gross		12,788	288
Debt Securities, Held-to-Maturity, carrying value		12,788	288
Investment Securities, fair value		12,199	286
Investment Securities, Gross Unrealized Gain		0	0
Investment Securities, Gross Unrealized Loss		$ (589)	$ (2)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		3	2
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 9,428	$ 273
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		257	0
Investment Securities, Continuous Unrealized Loss Position, Fair Value		9,685	273
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses		571	2
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses		18	0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ 589	$ 2

[1] Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.

[2] The average expected lives of residential mortgage-backed securities were 5.4 years based upon current prepayment assumptions.