Non-Interest Revenues - Non-interest Revenues by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Non-interest income	$ 11,195	$ 11,243	$ 22,749	$ 23,591
Interchange and card revenue
Disaggregation of Revenue [Line Items]
Non-interest income	6,478	6,760	13,287	15,565
Deposit fees
Disaggregation of Revenue [Line Items]
Non-interest income	3,321	3,348	6,782	5,557
Customers Bank Business Banking
Disaggregation of Revenue [Line Items]
Non-interest income	695	652	1,517	1,131
BankMobile
Disaggregation of Revenue [Line Items]
Non-interest income	10,500	10,591	21,232	22,460
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Non-interest income	10,188	10,275	20,750	21,644
Transferred at Point in Time | Interchange and card revenue
Disaggregation of Revenue [Line Items]
Non-interest income	6,478	6,760	13,287	15,565
Transferred at Point in Time | Deposit fees
Disaggregation of Revenue [Line Items]
Non-interest income	3,321	3,348	6,782	5,557
Transferred at Point in Time | University fees - card and disbursement fees
Disaggregation of Revenue [Line Items]
Non-interest income	389	167	681	522
Transferred at Point in Time | Customers Bank Business Banking
Disaggregation of Revenue [Line Items]
Non-interest income	695	652	1,517	1,131
Transferred at Point in Time | Customers Bank Business Banking | Interchange and card revenue
Disaggregation of Revenue [Line Items]
Non-interest income	193	219	463	398
Transferred at Point in Time | Customers Bank Business Banking | Deposit fees
Disaggregation of Revenue [Line Items]
Non-interest income	502	433	1,054	733
Transferred at Point in Time | Customers Bank Business Banking | University fees - card and disbursement fees
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	0
Transferred at Point in Time | BankMobile
Disaggregation of Revenue [Line Items]
Non-interest income	9,493	9,623	19,233	20,513
Transferred at Point in Time | BankMobile | Interchange and card revenue
Disaggregation of Revenue [Line Items]
Non-interest income	6,285	6,541	12,824	15,167
Transferred at Point in Time | BankMobile | Deposit fees
Disaggregation of Revenue [Line Items]
Non-interest income	2,819	2,915	5,728	4,824
Transferred at Point in Time | BankMobile | University fees - card and disbursement fees
Disaggregation of Revenue [Line Items]
Non-interest income	389	167	681	522
Transferred over Time
Disaggregation of Revenue [Line Items]
Non-interest income	1,007	968	1,999	1,947
Transferred over Time | University fees - subscription revenue
Disaggregation of Revenue [Line Items]
Non-interest income	1,007	968	1,999	1,947
Transferred over Time | Customers Bank Business Banking
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	0
Transferred over Time | Customers Bank Business Banking | University fees - subscription revenue
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	0
Transferred over Time | BankMobile
Disaggregation of Revenue [Line Items]
Non-interest income	1,007	968	1,999	1,947
Transferred over Time | BankMobile | University fees - subscription revenue
Disaggregation of Revenue [Line Items]
Non-interest income	$ 1,007	$ 968	$ 1,999	$ 1,947