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Non-Interest Revenues - Non-interest Revenues by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 11,243	$ 9,106	$ 23,591	$ 22,056
Interchange and card revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	6,760	6,382	15,565	16,043
Deposit fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3,348	1,632	5,557	3,724
Customers Bank Business Banking
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	652	477	1,131	986
BankMobile
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	10,591	8,629	22,460	21,070
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	10,275	8,199	21,644	20,279
Transferred at Point in Time | Interchange and card revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	6,760	6,382	15,565	16,043
Transferred at Point in Time | Deposit fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3,348	1,632	5,557	3,724
Transferred at Point in Time | University fees - card and disbursement fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	167	185	522	512
Transferred at Point in Time | Customers Bank Business Banking
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	652	477	1,131	986
Transferred at Point in Time | Customers Bank Business Banking | Interchange and card revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	219	183	398	406
Transferred at Point in Time | Customers Bank Business Banking | Deposit fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	433	294	733	580
Transferred at Point in Time | Customers Bank Business Banking | University fees - card and disbursement fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Transferred at Point in Time | BankMobile
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	9,623	7,722	20,513	19,293
Transferred at Point in Time | BankMobile | Interchange and card revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	6,541	6,199	15,167	15,637
Transferred at Point in Time | BankMobile | Deposit fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,915	1,338	4,824	3,144
Transferred at Point in Time | BankMobile | University fees - card and disbursement fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	167	185	522	512
Transferred over Time
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	968	907	1,947	1,777
Transferred over Time | University fees - subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	968	907	1,947	1,777
Transferred over Time | Customers Bank Business Banking
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Transferred over Time | Customers Bank Business Banking | University fees - subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Transferred over Time | BankMobile
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	968	907	1,947	1,777
Transferred over Time | BankMobile | University fees - subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 968	$ 907	$ 1,947	$ 1,777

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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