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Borrowings - Repurchase agreements accounted for as secured borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets Sold under Agreements to Repurchase
Repurchase liability	$ 91,603	$ 121,303
Secured Debt
Assets Sold under Agreements to Repurchase
Repurchase liability	$ 91,603	$ 121,303
Repurchase liability weighted average interest rate	0.26%	1.07%
US Treasury Securities | Secured Debt
Assets Sold under Agreements to Repurchase
Repurchase liability	$ 78,869	$ 116,454
Repurchase liability weighted average interest rate	0.26%	1.10%
US Treasury Securities | Within 30 days | Secured Debt
Assets Sold under Agreements to Repurchase
Repurchase liability	$ 19,538	$ 67,157
Repurchase liability weighted average interest rate	0.30%	1.16%
US Treasury Securities | After 30 to 90 days | Secured Debt
Assets Sold under Agreements to Repurchase
Repurchase liability	$ 30,295	$ 39,318
Repurchase liability weighted average interest rate	0.21%	1.20%
US Treasury Securities | After 90 days | Secured Debt
Assets Sold under Agreements to Repurchase
Repurchase liability	$ 29,036	$ 9,979
Repurchase liability weighted average interest rate	0.29%	0.33%
Mortgage Backed Securities | Secured Debt
Assets Sold under Agreements to Repurchase
Repurchase liability	$ 12,455	$ 4,046
Repurchase liability weighted average interest rate	0.26%	0.36%
Mortgage Backed Securities | Within 30 days | Secured Debt
Assets Sold under Agreements to Repurchase
Repurchase liability	$ 11,733	$ 3,778
Repurchase liability weighted average interest rate	0.26%	0.28%
Mortgage Backed Securities | After 30 to 90 days | Secured Debt
Assets Sold under Agreements to Repurchase
Repurchase liability	$ 0	$ 268
Repurchase liability weighted average interest rate	0.00%	1.50%
Mortgage Backed Securities | After 90 days | Secured Debt
Assets Sold under Agreements to Repurchase
Repurchase liability	$ 722	$ 0
Repurchase liability weighted average interest rate	0.16%	0.00%
CMO | Secured Debt
Assets Sold under Agreements to Repurchase
Repurchase liability	$ 279	$ 803
Repurchase liability weighted average interest rate	0.25%	0.24%
CMO | Within 30 days | Secured Debt
Assets Sold under Agreements to Repurchase
Repurchase liability	$ 279	$ 803
Repurchase liability weighted average interest rate	0.25%	0.24%

X

- Definition

Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

+ 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)(ii)(A)(ii))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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+ References

No definition available.

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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 http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
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-URI http://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
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-Section S99
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-Subparagraph (SX 210.4-08(m)(1)(ii)(A)(i))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 50
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-Topic 942
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