Mortgage Banking - Additional information (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Mortgage Banking [Abstract]
Residential Mortgage Loans, Unpaid Balance	$ 2,900,000,000		$ 2,900,000,000		$ 2,900,000,000
Accrued Liabilities and Other Liabilities					$ 43,000
Expenses (credit) relating to secondary market buy-back activity	$ (43,000)	$ 0	$ 43,000	$ 0

Amount of expenses incurred but not yet paid nor invoiced, and liabilities classified as other.

No definition available.

Name:	us-gaap_AccruedLiabilitiesAndOtherLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant