Loans Receivable and Allowance for Credit Losses - (Narrative for Credit Risk Ratings and/or Vintage Years for Loans Held-for-Investment by Portfolio Segment) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
HELOCs
Financing Receivable, Credit Quality Indicator [Line Items]
Amount converted to loans	$ 54,100	$ 145,000
C&I
Financing Receivable, Credit Quality Indicator [Line Items]
Amount converted to loans	$ 78	$ 23,900
Number of converted loans | loan	1	4
CRE
Financing Receivable, Credit Quality Indicator [Line Items]
Amount converted to loans	$ 6,400
Number of converted loans | loan	3