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Borrowings - Repurchase agreements accounted for as secured borrowings (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | $ 93,071 | $ 148,609
Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 93,071 | 148,609
US Treasury Securities | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 44,115 | 48,670
US Treasury Securities | Within 30 days | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 12,736 | 410
US Treasury Securities | After 30 to 90 days | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 13,199 | 30,739
US Treasury Securities | After 90 days | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 18,180 | 17,521
Mortgage Backed Securities | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 48,710 | 99,775
Mortgage Backed Securities | Within 30 days | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 28,211 | 98,984
Mortgage Backed Securities | After 30 to 90 days | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 0 | 791
Mortgage Backed Securities | After 90 days | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 20,499 | 0
CMO | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 246 | 164
CMO | Within 30 days | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | $ 246 | $ 164

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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(i)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(ii)(A)(i)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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