Commitments and Contingent Liabilities (Narrative) (Details)	12 Months Ended
Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items]
Technology outsourcing services, commitment period	7 years
Technology Outsourcing Services [Member]
Loss Contingencies [Line Items]
Percentage decrease in termination fees in each succeeding year, if terminated	15.00%
Service Bureau One [Member]
Loss Contingencies [Line Items]
Technology outsourcing services, estimated contract termination fees	$ 2,053,000
Service Bureau Two [Member]
Loss Contingencies [Line Items]
Technology outsourcing services, estimated contract termination fees	$ 981,000

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12021-110248

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