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Borrowings - Repurchase agreements accounted for as secured borrowings (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 72,819 $ 91,603
Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability 72,819 91,603
US Treasury Securities | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability 62,367 78,869
US Treasury Securities | Within 30 days | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability 14,525 19,538
US Treasury Securities | After 30 to 90 days | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability 14,975 30,295
US Treasury Securities | After 90 days | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability 32,867 29,036
Mortgage Backed Securities | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability 10,158 12,455
Mortgage Backed Securities | Within 30 days | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability 2,763 11,733
Mortgage Backed Securities | After 90 days | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability 7,395 722
CMO | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability 294 279
CMO | Within 30 days | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 294 $ 279