Commitments and Contingencies - Commitments to Originate (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Commitments and Contingencies
Outstanding principal balance	$ 274,485,000	$ 278,120,000
MPF Program
Commitments and Contingencies
Outstanding principal balance	9,500,000
Recourse back to bank for loans sold	707,000,000,000
First loss account allocated to bank	89,000
MPF Program, Inclusive of USDA Loans
Commitments and Contingencies
Outstanding principal balance	$ 68,600,000

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Name:	us-gaap_LoansAndLeasesReceivableNetReportedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant