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Allowance for Credit Losses (Summary of Activity in the Allowance for Credit Losses by Loan Portfolio) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 15, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for credit losses at beginning of period |  | $ 299,653 | $ 379,910
Other adjustments |  | (108) | 3
Charge-offs |  | (31,779) | (35,019)
Recoveries |  | 11,503 | 13,569
Provision for credit losses |  | 78,179 | (59,280)
Allowance for credit losses at period end |  | 357,448 | 299,653
Individually evaluated for impairment |  | 6,799 | 8,552
Collectively evaluated for impairment |  | 350,649 | 291,101
Loans at period end, individually evaluated for impairment |  | 90,197 | 93,270
Loans at period end, collectively evaluated for impairment |  | 38,926,356 | 34,657,236
Loans held-for-investment |  | 179,932 | 38,598
Allstate Corporation Loan Portfolio |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Initial allowance for credit losses recognized on PCD assets acquired during period |  |  | 470
Allowance for credit losses | $ 2,800 |  |
Allowance for credit losses, amounts charged-off | $ 2,300 |  |
Allstate Corporation Loan Portfolio | Loans acquired with deteriorated credit quality |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Initial allowance for credit losses recognized on PCD assets acquired during period |  |  | 470
Commercial |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for credit losses at beginning of period |  | 119,307 | 94,212
Other adjustments |  | 0 | 0
Charge-offs |  | (14,141) | (20,801)
Recoveries |  | 4,748 | 2,559
Provision for credit losses |  | 32,855 | 42,867
Allowance for credit losses at period end |  | 142,769 | 119,307
Individually evaluated for impairment |  | 5,973 | 5,196
Collectively evaluated for impairment |  | 136,796 | 114,111
Loans at period end, individually evaluated for impairment |  | 38,042 | 24,530
Loans at period end, collectively evaluated for impairment |  | 12,511,122 | 11,879,538
Loans held-for-investment |  | 0 | 0
Commercial | Allstate Corporation Loan Portfolio | Loans acquired with deteriorated credit quality |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Initial allowance for credit losses recognized on PCD assets acquired during period |  |  | 470
Commercial Real Estate |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for credit losses at beginning of period |  | 144,583 | 243,603
Other adjustments |  | 0 | 0
Charge-offs |  | (1,379) | (3,293)
Recoveries |  | 701 | 1,304
Provision for credit losses |  | 40,447 | (97,031)
Allowance for credit losses at period end |  | 184,352 | 144,583
Individually evaluated for impairment |  | 61 | 2,237
Collectively evaluated for impairment |  | 184,291 | 142,346
Loans at period end, individually evaluated for impairment |  | 21,435 | 30,167
Loans at period end, collectively evaluated for impairment |  | 9,929,512 | 8,960,119
Loans held-for-investment |  | 0 | 0
Commercial Real Estate | Allstate Corporation Loan Portfolio | Loans acquired with deteriorated credit quality |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Initial allowance for credit losses recognized on PCD assets acquired during period |  |  | 0
Home Equity |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for credit losses at beginning of period |  | 10,699 | 11,437
Other adjustments |  | 0 | 0
Charge-offs |  | (432) | (336)
Recoveries |  | 319 | 1,203
Provision for credit losses |  | (3,013) | (1,605)
Allowance for credit losses at period end |  | 7,573 | 10,699
Individually evaluated for impairment |  | 50 | 192
Collectively evaluated for impairment |  | 7,523 | 10,507
Loans at period end, individually evaluated for impairment |  | 10,351 | 14,656
Loans at period end, collectively evaluated for impairment |  | 322,347 | 320,499
Loans held-for-investment |  | 0 | 0
Home Equity | Allstate Corporation Loan Portfolio | Loans acquired with deteriorated credit quality |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Initial allowance for credit losses recognized on PCD assets acquired during period |  |  | 0
Residential Real Estate |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for credit losses at beginning of period |  | 8,782 | 12,459
Other adjustments |  | 0 | 0
Charge-offs |  | (471) | (1,082)
Recoveries |  | 77 | 330
Provision for credit losses |  | 3,197 | (2,925)
Allowance for credit losses at period end |  | 11,585 | 8,782
Individually evaluated for impairment |  | 715 | 899
Collectively evaluated for impairment |  | 10,870 | 7,883
Loans at period end, individually evaluated for impairment |  | 20,300 | 23,306
Loans at period end, collectively evaluated for impairment |  | 2,172,151 | 1,575,195
Loans held-for-investment |  | 179,932 | 38,598
Residential Real Estate | Allstate Corporation Loan Portfolio | Loans acquired with deteriorated credit quality |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Initial allowance for credit losses recognized on PCD assets acquired during period |  |  | 0
Premium Finance Receivable |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for credit losses at beginning of period |  | 15,859 | 17,777
Other adjustments |  | (108) | 3
Charge-offs |  | (14,275) | (9,020)
Recoveries |  | 5,522 | 7,989
Provision for credit losses |  | 3,673 | (890)
Allowance for credit losses at period end |  | 10,671 | 15,859
Individually evaluated for impairment |  | 0 | 0
Collectively evaluated for impairment |  | 10,671 | 15,859
Loans at period end, individually evaluated for impairment |  | 0 | 0
Loans at period end, collectively evaluated for impairment |  | 13,940,457 | 11,898,297
Loans held-for-investment |  | 0 | 0
Premium Finance Receivable | Allstate Corporation Loan Portfolio | Loans acquired with deteriorated credit quality |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Initial allowance for credit losses recognized on PCD assets acquired during period |  |  | 0
Consumer and other |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for credit losses at beginning of period |  | 423 | 422
Other adjustments |  | 0 | 0
Charge-offs |  | (1,081) | (487)
Recoveries |  | 136 | 184
Provision for credit losses |  | 1,020 | 304
Allowance for credit losses at period end |  | 498 | 423
Individually evaluated for impairment |  | 0 | 28
Collectively evaluated for impairment |  | 498 | 395
Loans at period end, individually evaluated for impairment |  | 69 | 611
Loans at period end, collectively evaluated for impairment |  | 50,767 | 23,588
Loans held-for-investment |  | $ 0 | 0
Consumer and other | Allstate Corporation Loan Portfolio | Loans acquired with deteriorated credit quality |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Initial allowance for credit losses recognized on PCD assets acquired during period |  |  | $ 0

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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=123409700&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 + Details
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- Definition Amount of reduction in the reserve for loans impairments as a result of current information and events which result in it being probable that estimated cash flows will be significantly higher than previously expected or because actual cash flows are significantly greater than cash flows previously expected for loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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