Loans Receivable, Including Loans Held For Sale - Outstanding Loans (Accruing and Nonaccruing) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Receivable [Line Items]
Total loans	$ 2,560,225	$ 554,722
Commercial real estate loans
Receivable [Line Items]
Total loans	617	659
Commercial and industrial
Receivable [Line Items]
Total loans	2,347,005	251,349
Consumer loans
Receivable [Line Items]
Total loans	212,603	302,714
Non-Graded
Receivable [Line Items]
Total loans	451,104	537,274
Non-Graded | Commercial real estate loans
Receivable [Line Items]
Total loans	0	0
Non-Graded | Commercial and industrial
Receivable [Line Items]
Total loans	238,501	234,560
Non-Graded | Consumer loans
Receivable [Line Items]
Total loans	212,603	302,714
Pass
Receivable [Line Items]
Total loans	2,102,853	14,730
Pass | Commercial real estate loans
Receivable [Line Items]
Total loans	606	647
Pass | Commercial and industrial
Receivable [Line Items]
Total loans	2,102,247	14,083
Pass | Consumer loans
Receivable [Line Items]
Total loans	0	0
Special Mention
Receivable [Line Items]
Total loans	3,527	0
Special Mention | Commercial real estate loans
Receivable [Line Items]
Total loans	0	0
Special Mention | Commercial and industrial
Receivable [Line Items]
Total loans	3,527	0
Special Mention | Consumer loans
Receivable [Line Items]
Total loans	0	0
Sub- standard
Receivable [Line Items]
Total loans	2,043	2,718
Sub- standard | Commercial real estate loans
Receivable [Line Items]
Total loans	11	12
Sub- standard | Commercial and industrial
Receivable [Line Items]
Total loans	2,032	2,706
Sub- standard | Consumer loans
Receivable [Line Items]
Total loans	0	0
Doubtful
Receivable [Line Items]
Total loans	698	0
Doubtful | Commercial real estate loans
Receivable [Line Items]
Total loans	0	0
Doubtful | Commercial and industrial
Receivable [Line Items]
Total loans	698	0
Doubtful | Consumer loans
Receivable [Line Items]
Total loans	$ 0	$ 0