Notes Payable and Amounts Due Under Repurchase Agreements (Repurchase Agreements Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Disclosure [Abstract]
Repurchase agreement, average borrowings	$ 0	$ 0	$ 0	$ 19,000
Repurchase agreement, maximum amount borrowed				$ 186,400
Repurchase agreement, weighted average interest rate				1.73%

The maximum amount borrowed on repurchase agreements during the reporting period.

No definition available.

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- Definition

Average rate paid on securities sold under agreements to repurchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1402
-Paragraph (a)

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1402
-Paragraph (b)
-Subparagraph (3)

+ Details

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- References

No definition available.

+ Details

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- Definition

Average amount outstanding of securities sold under agreements to repurchase.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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