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Repurchase Agreement Borrowings (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | $ 210,979 | $ 317,230
Pledged Assets Separately Reported, Securities Pledged for Repurchase Agreements, at Fair Value | 319,000 | 366,000
Available unpledged securities | 909,000 | 439,000
Maturity Overnight [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | 210,979 | 317,230
Maturity up to 30 days [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | 0 | 0
Maturity 30 to 90 Days [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | 0 | 0
Maturity over 90 days [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | $ 0 | $ 0

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- Definition The fair value, as of the date of each statement of financial position presented, of securities which are owned but transferred to serve as collateral for the payment of repurchase agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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- Definition Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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