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Short-Term Debt and Long-term Debt (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Securities pledged as collateral	$ 0	$ 0
Unamortized prepayment penalties	$ 1,500,000	2,100,000
Maximum ratio of debt to total assets under debt covenant	50.00%
Maximum total debt under debt covenant	$ 1,773,000,000
Asset Pledged as Collateral [Member]
Debt Instrument [Line Items]
Financing receivables	1,200,000,000	$ 733,300,000
FHLB Advances Due In 2021 Through 2024 [Member]
Debt Instrument [Line Items]
Debt extinguished	$ 115,000,000.0
Weighted average interest rate	1.60%
Increase (decrease) in weighted average interest rate	(0.16%)

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- Definition

Federal Home Loan Bank Advances, Unamortized Prepayment Penalties

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- Definition

Increase (Decrease) In Weighted Average Interest Rate

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- Definition

Maximum ratio of debt to total assets under debt covenant.

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- Definition

Maximum total debt under debt covenant.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 210
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=127002003&loc=SL6242269-115581

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 210
-Section 45
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580

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- Definition

Weighted average interest rate of debt outstanding.

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- Definition

Gross amount of debt extinguished.

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- Definition

Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

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