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Investment (Held-to-Maturity) Securities (Details)
$ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2023

USD ($)

Dec. 31, 2022

USD ($)

Schedule of Investment (Held-to-Maturity) Securities [Line Items]

Investment Securities, Gross Amortized Cost

$ 2,657,577

$ 2,739,241

Investment Securities, Gross Carrying Value

2,448,633

^[1]

2,514,245

^[2]

Investment securities, Allowance for Credit Loss

(497)

^[1]

(558)

^[2]

Investment Securities, Amortized Cost, After Allowance for Credit Loss

2,657,080

2,738,683

Investment Securities, Carrying Value, after Allowance for Credit Loss

2,448,136

^[1]

2,513,687

^[2]

Investment Securities, Fair Value

2,307,686

2,346,768

Investment Securities, Gross Unrealized Gain

7,484

6,611

Investment Securities, Gross Unrealized Loss

(148,431)

(174,088)

Debt Securities, Net Unrealized Loss Remaining in AOCI included in Carrying Value for AFS Securities Transferred to Investment Securities

$ (209,000)

$ (225,000)

Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]

Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions

130

143

Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]

Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value

$ 2,139,747

$ 2,184,167

Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value

8,448

801

Investment Securities, Continuous Unrealized Loss Position, Fair Value

2,148,195

2,184,968

Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]

Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss

148,134

174,012

Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss

297

76

Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss

148,431

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

24,634

Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value

92,723

Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value

66,341

Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value

13

Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value

183,711

Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]

Investment Securities, Debt Maturities, Less Than One Year, Fair Value

24,917

Investment Securities, Debt Maturities, One to Five Years, Fair Value

99,241

Investment Securities, Debt Maturities, Six to Ten Years, Fair Value

64,977

Investment Securities, Debt Maturities, Over Ten Years, Fair Value

13

Investment Securities, Debt Maturities, Single Maturity Date, Fair Value

$ 189,148

Investment Securities, Debt Maturities, Weighted Average Maturity

^[3]

3.94

Municipal securities [Member]

Schedule of Investment (Held-to-Maturity) Securities [Line Items]

Investment Securities, Gross Amortized Cost

$ 153,739

170,629

Investment Securities, Gross Carrying Value

153,739

^[1]

170,629

^[2]

Investment Securities, Fair Value

160,866

176,621

Investment Securities, Gross Unrealized Gain

7,321

6,456

Investment Securities, Gross Unrealized Loss

$ (194)

$ (464)

Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]

Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions

9

22

Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]

Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value

$ 0

$ 18,037

Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value

6,594

544

Investment Securities, Continuous Unrealized Loss Position, Fair Value

6,594

18,581

Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]

Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss

0

406

Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss

194

58

Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss

194

464

Residential agency mortgage-backed securities [Member]

Schedule of Investment (Held-to-Maturity) Securities [Line Items]

Investment Securities, Gross Amortized Cost

2,472,291

2,538,565

Investment Securities, Gross Carrying Value

2,264,922

^[1]

2,315,219

^[2]

Investment Securities, Fair Value

2,118,538

2,143,360

Investment Securities, Gross Unrealized Gain

163

155

Investment Securities, Gross Unrealized Loss

(146,547)

$ (172,014)

Investment Securities, Debt Maturities, Net Carrying Value [Abstract]

Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value

^[4]

2,264,922

Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]

Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value

$ 2,118,538

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

Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]

Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value

$ 2,115,733

$ 2,142,114

Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value

1,599

0

Investment Securities, Continuous Unrealized Loss Position, Fair Value

2,117,332

2,142,114

Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]

Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss

146,464

172,014

Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss

83

0

Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss

146,547

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

Investment Securities, Gross Carrying Value

15,684

^[1]

15,609

^[2]

Investment Securities, Fair Value

14,861

14,588

Investment Securities, Gross Unrealized Gain

0

0

Investment Securities, Gross Unrealized Loss

$ (823)

$ (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

Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]

Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value

$ 14,861

$ 14,588

Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value

0

0

Investment Securities, Continuous Unrealized Loss Position, Fair Value

14,861

14,588

Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]

Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss

823

1,021

Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss

0

0

Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss

823

1,021

Other debt securities [Member]

Schedule of Investment (Held-to-Maturity) Securities [Line Items]

Investment Securities, Gross Amortized Cost

14,288

12,788

Investment Securities, Gross Carrying Value

14,288

^[1]

12,788

^[2]

Investment Securities, Fair Value

13,421

12,199

Investment Securities, Gross Unrealized Gain

0

0

Investment Securities, Gross Unrealized Loss

$ (867)

$ (589)

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

$ 9,153

$ 9,428

Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value

255

257

Investment Securities, Continuous Unrealized Loss Position, Fair Value

9,408

9,685

Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]

Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss

847

571

Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss

20

18

Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss

$ 867

$ 589

[1]	Carrying value includes $209 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 as discussed in greater detail following.
[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 as discussed in greater detail following.
[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 years based upon current prepayment assumptions.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in sixth through tenth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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