Securities Sold Under Agreements to Repurchase - Carrying Value of Repurchase Agreements (Details) - Overnight and Continuous - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Securities Sold Under Agreements to Repurchase
Repurchase agreements	$ 1,499,696	$ 945,916
U.S. government and federal agency
Securities Sold Under Agreements to Repurchase
Repurchase agreements	117,284	0
Residential mortgage-backed securities
Securities Sold Under Agreements to Repurchase
Repurchase agreements	1,300,892	945,916
Commercial mortgage-backed securities
Securities Sold Under Agreements to Repurchase
Repurchase agreements	$ 81,520	$ 0

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481420/860-30-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481420/860-30-50-7

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