Derivative Financial Instruments Fair Value Option (Details) - Mortgage Loans Held For Sale - Mortgage Loans Held For Sale - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]
Cost	$ 37,396	$ 26,407
Fair value	$ 37,828	$ 27,099

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_FairValueOptionQuantitativeDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration