Loans Receivable, Including Loans Held For Sale - Past Due Loans (Accruing and Nonaccruing) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Receivable [Line Items]
Current	$ 2,532,551	$ 531,078
Total past due	27,674	23,644
Total Loans	2,560,225	554,722
Recorded investment in accruing loans 90 days past due	12,922	8,051
Nonaccrual loans that are current	0	0
30-89 Days Past Due
Receivable [Line Items]
Total past due	14,752	15,593
90+ Days Past Due
Receivable [Line Items]
Total past due	12,922	8,051
Commercial real estate loans
Receivable [Line Items]
Current	617	659
Total past due	0	0
Total Loans	617	659
Recorded investment in accruing loans 90 days past due	0	0
Nonaccrual loans that are current	0	0
Commercial real estate loans | 30-89 Days Past Due
Receivable [Line Items]
Total past due	0	0
Commercial real estate loans | 90+ Days Past Due
Receivable [Line Items]
Total past due	0	0
Commercial and industrial
Receivable [Line Items]
Current	2,324,547	238,025
Total past due	22,458	13,324
Total Loans	2,347,005	251,349
Recorded investment in accruing loans 90 days past due	11,298	4,962
Nonaccrual loans that are current	0	0
Commercial and industrial | 30-89 Days Past Due
Receivable [Line Items]
Total past due	11,160	8,362
Commercial and industrial | 90+ Days Past Due
Receivable [Line Items]
Total past due	11,298	4,962
Consumer loans
Receivable [Line Items]
Current	207,387	292,394
Total past due	5,216	10,320
Total Loans	212,603	302,714
Recorded investment in accruing loans 90 days past due	1,624	3,089
Nonaccrual loans that are current	0	0
Consumer loans | 30-89 Days Past Due
Receivable [Line Items]
Total past due	3,592	7,231
Consumer loans | 90+ Days Past Due
Receivable [Line Items]
Total past due	$ 1,624	$ 3,089