Loans and Allowance for Credit Losses on Loans - Troubled Debt Restructurings by Class (Details)	3 Months Ended	6 Months Ended
Jun. 30, 2021 loan	Jun. 30, 2020 loan	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($)
Troubled Debt Restructurings by Class
Number of loans modified as troubled debt restructurings during the period	0	0	1	3,000
Pre-modification Outstanding Recorded Investment			$ 3,000	$ 13,000
Post-modification Outstanding Recorded Investment			$ 3,000	$ 13,000
Commercial
Troubled Debt Restructurings by Class
Number of loans modified as troubled debt restructurings during the period			1,000	3,000
Pre-modification Outstanding Recorded Investment			$ 3,000	$ 13,000
Post-modification Outstanding Recorded Investment			$ 3,000	$ 13,000

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

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- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

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