Allowance for Credit Losses on Loans - Troubled Debt Restructurings by Class (Details) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($) contract	Mar. 31, 2019 loan
Troubled Debt Restructurings by Class
Number of loans modified as troubled debt restructurings during the period	3	0
Pre-modification Outstanding Recorded Investment	$ 13
Post-modification Outstanding Recorded Investment	$ 13
Commercial
Troubled Debt Restructurings by Class
Number of loans modified as troubled debt restructurings during the period \| contract	3
Pre-modification Outstanding Recorded Investment	$ 13
Post-modification Outstanding Recorded Investment	$ 13

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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=118936363&loc=SL6953676-111524

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

+ References

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- Definition

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

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