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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interchange and card revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 6,382	$ 8,648	$ 16,043	$ 22,158
Deposit Fees
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,632	2,133	3,724	5,260
Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,200	1,300	2,700	3,200
Total revenue from contracts with customers	9,106	11,771	22,056	29,592
Accounting Standards Update 2014-09 | Community Business Banking
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	477	384	986	910
Accounting Standards Update 2014-09 | BankMobile
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	8,629	11,387	21,070	28,682
Accounting Standards Update 2014-09 | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
University Fees - Card and Disbursement Fees	185	206	512	595
Total revenue from contracts with customers	8,199	10,987	20,279	28,013
Accounting Standards Update 2014-09 | Transferred at Point in Time | Interchange and card revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	6,382	8,648	16,043	22,158
Accounting Standards Update 2014-09 | Transferred at Point in Time | Deposit Fees
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,632	2,133	3,724	5,260
Accounting Standards Update 2014-09 | Transferred at Point in Time | Community Business Banking
Disaggregation of Revenue [Line Items]
University Fees - Card and Disbursement Fees	0	0	0	0
Total revenue from contracts with customers	477	384	986	910
Accounting Standards Update 2014-09 | Transferred at Point in Time | Community Business Banking | Interchange and card revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	183	126	406	328
Accounting Standards Update 2014-09 | Transferred at Point in Time | Community Business Banking | Deposit Fees
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	294	258	580	582
Accounting Standards Update 2014-09 | Transferred at Point in Time | BankMobile
Disaggregation of Revenue [Line Items]
University Fees - Card and Disbursement Fees	185	206	512	595
Total revenue from contracts with customers	7,722	10,603	19,293	27,103
Accounting Standards Update 2014-09 | Transferred at Point in Time | BankMobile | Interchange and card revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	6,199	8,522	15,637	21,830
Accounting Standards Update 2014-09 | Transferred at Point in Time | BankMobile | Deposit Fees
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,338	1,875	3,144	4,678
Accounting Standards Update 2014-09 | Transferred over Time
Disaggregation of Revenue [Line Items]
University Fees - Subscription Revenue	907	784	1,777	1,579
Total revenue from contracts with customers	907	784	1,777	1,579
Accounting Standards Update 2014-09 | Transferred over Time | Community Business Banking
Disaggregation of Revenue [Line Items]
University Fees - Subscription Revenue	0	0	0	0
Total revenue from contracts with customers	0	0	0	0
Accounting Standards Update 2014-09 | Transferred over Time | BankMobile
Disaggregation of Revenue [Line Items]
University Fees - Subscription Revenue	907	784	1,777	1,579
Total revenue from contracts with customers	$ 907	$ 784	$ 1,777	$ 1,579

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