|**Transfers Accounted for as Secured Borrowings**    | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|---------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
|**Banking and Thrift [Abstract]**                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Transfers Accounted for as Secured Borrowings        | TRANSFERS ACCOUNTED FOR AS SECURED BORROWINGSThe collateral pledged for all repurchase agreements that are accounted for as secured borrowings as ofMarch 31, 2020andDecember 31, 2019were:March 31, 2020Remaining Contractual Maturity of the AgreementsOvernight and ContinuousUp to 30 Days30-90 DaysGreater Than 90 DaysTotalU.S. Government-sponsored mortgage-backed securities$180,925$—$1,642$750$183,317December 31, 2019Remaining Contractual Maturity of the AgreementsOvernight and ContinuousUp to 30 Days30-90 DaysGreater Than 90 DaysTotalU.S. Government-sponsored mortgage-backed securities$178,732$—$7,672$1,542$187,946
|                                                    
|                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                     | March 31, 2020                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                     | Remaining Contractual Maturity of the Agreements                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|                                                     | Overnight and Continuous                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|U.S. Government-sponsored mortgage-backed securities | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|                                                    
|                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                     | December 31, 2019                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|                                                     | Remaining Contractual Maturity of the Agreements                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|                                                     | Overnight and Continuous                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|U.S. Government-sponsored mortgage-backed securities | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

X- ReferencesNo definition available.
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duration X- DefinitionThe entire disclosure for repurchase agreements (also known as repos), resale agreements (also known as reverse repurchase agreements or reverse repos), securities borrowed transactions, and securities loaned transactions.
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