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v3.23.1

Available for Sale Securities (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 12,679,349 |  | $ 12,359,413
Available-for-sale Securities, Fair Value |  | 11,937,841 |  | 11,493,860
Available-for-sale Securities, Gross Unrealized Gain |  | 33,726 |  | 28,661
Available-for-sale Securities, Gross Unrealized Loss |  | (775,234) |  | $ (894,214)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |
Available-for-sale Securities, Proceeds |  | 0 | $ 55,185 |
Available-for-sale Securities, Gross realized gains |  | 0 | 1,933 |
Available-for-sale Securities, Gross realized losses |  | 0 | (996) |
Available-for-sale Securities, Related federal and state income tax expense (benefit) |  | $ 0 | $ 219 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 1,153 |  | 1,153
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 2,648,291 |  | $ 6,173,710
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 60,748 |  | 376,598
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 7,485,234 |  | 3,829,168
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 714,486 |  | 517,616
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 10,133,525 |  | 10,002,878
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | 775,234 |  | 894,214
Asset Pledged as Collateral with Right |  |  |  |
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |
Pledged Securities |  | 9,900,000 |  | 11,200,000
Fixed Maturity Securities [Member] |  |  |  |
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis |  | 148,742 |  |
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis |  | 2,665,838 |  |
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis |  | 2,360,090 |  |
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis |  | 502,606 |  |
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost |  | 5,677,276 |  |
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value |  | 146,996 |  |
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value |  | 2,510,112 |  |
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 2,131,783 |  |
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value |  | 474,891 |  |
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value |  | $ 5,263,782 |  |
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity | [1] | 5.82 |  |
U.S. Treasury [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 1,000 |  | 1,000
Available-for-sale Securities, Fair Value |  | 914 |  | 898
Available-for-sale Securities, Gross Unrealized Gain |  | 0 |  | 0
Available-for-sale Securities, Gross Unrealized Loss |  | $ (86) |  | $ (102)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 1 |  | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 0 |  | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0 |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 914 |  | 899
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 86 |  | 102
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 914 |  | 899
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | 86 |  | 102
Municipal securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 685,963 |  | 687,875
Available-for-sale Securities, Fair Value |  | 634,207 |  | 624,500
Available-for-sale Securities, Gross Unrealized Gain |  | 1,338 |  | 321
Available-for-sale Securities, Gross Unrealized Loss |  | $ (53,094) |  | $ (63,696)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 215 |  | 227
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 61,983 |  | $ 146,634
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 767 |  | 5,301
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 487,032 |  | 428,248
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 52,327 |  | 58,395
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 549,015 |  | 574,882
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | 53,094 |  | 63,696
Commercial agency mortgage-backed securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 4,989,813 |  | 4,892,257
Available-for-sale Securities, Fair Value |  | 4,628,188 |  | 4,475,917
Available-for-sale Securities, Gross Unrealized Gain |  | 5,738 |  | 3,479
Available-for-sale Securities, Gross Unrealized Loss |  | $ (367,363) |  | $ (419,819)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 288 |  | 285
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 824,751 |  | $ 1,647,778
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 14,313 |  | 63,701
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 3,413,042 |  | 2,535,816
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 353,050 |  | 356,118
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 4,237,793 |  | 4,183,594
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | 367,363 |  | 419,819
Other debt securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 500 |  | 500
Available-for-sale Securities, Fair Value |  | 473 |  | 473
Available-for-sale Securities, Gross Unrealized Gain |  | 0 |  | 0
Available-for-sale Securities, Gross Unrealized Loss |  | $ (27) |  | $ (27)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 1 |  | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 0 |  | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0 |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 473 |  | 473
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 27 |  | 27
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 473 |  | 473
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | 27 |  | 27
Residential Mortgage Backed Securities [Member] |  |  |  |
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost | [2] | 7,002,073 |  |
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | $ 6,674,059 |  |
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  | 4 years 4 months 24 days |  |
Residential agency mortgage-backed securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 6,311,728 |  | 6,161,358
Available-for-sale Securities, Fair Value |  | 6,022,708 |  | 5,814,496
Available-for-sale Securities, Gross Unrealized Gain |  | 15,379 |  | 13,085
Available-for-sale Securities, Gross Unrealized Loss |  | $ (304,399) |  | $ (359,947)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 618 |  | 613
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 1,531,016 |  | $ 3,879,582
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 37,020 |  | 256,973
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 3,240,193 |  | 863,732
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 267,379 |  | 102,974
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 4,771,209 |  | 4,743,314
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | 304,399 |  | 359,947
Residential non-agency mortgage-backed securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 690,345 |  | 616,423
Available-for-sale Securities, Fair Value |  | 651,351 |  | 577,576
Available-for-sale Securities, Gross Unrealized Gain |  | 11,271 |  | 11,776
Available-for-sale Securities, Gross Unrealized Loss |  | $ (50,265) |  | $ (50,623)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 30 |  | 26
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 230,541 |  | $ 499,716
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 8,648 |  | 50,623
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 343,580 |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 41,617 |  | 0
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 574,121 |  | 499,716
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | $ 50,265 |  | $ 50,623
[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 4.4 years years based upon current prepayment assumptions.

X
- Definition The calculated weighted-average expected life of mortgage-backed securities based on prepayment assumptions as of the balance sheet date. + References No definition available. + Details
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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), 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. + References No definition available. + Details
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