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Non-Interest Revenues - Non-interest Revenues by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interchange and card revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 7,084	$ 9,570	$ 23,127	$ 31,729
Deposit fees
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2,002	2,659	5,726	7,918
Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,200	1,200	3,900	4,400
Total revenue from contracts with customers	10,297	13,341	32,352	42,933
Accounting Standards Update 2014-09 | Community Business Banking
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	492	536	1,480	1,446
Accounting Standards Update 2014-09 | BankMobile
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	9,805	12,805	30,872	41,487
Accounting Standards Update 2014-09 | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
University Fees - Card and Disbursement Fees	261	283	772	878
Total revenue from contracts with customers	9,347	12,512	29,625	40,525
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	7,084	9,570	23,127	31,729
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	2,002	2,659	5,726	7,918
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	492	536	1,480	1,446
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	181	215	588	544
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	311	321	892	902
Accounting Standards Update 2014-09 | Transferred at Point in Time | BankMobile
Disaggregation of Revenue [Line Items]
University Fees - Card and Disbursement Fees	261	283	772	878
Total revenue from contracts with customers	8,855	11,976	28,145	39,079
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	6,903	9,355	22,539	31,185
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	1,691	2,338	4,834	7,016
Accounting Standards Update 2014-09 | Transferred over Time
Disaggregation of Revenue [Line Items]
University Fees - Subscription Revenue	950	829	2,727	2,408
Total revenue from contracts with customers	950	829	2,727	2,408
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	950	829	2,727	2,408
Total revenue from contracts with customers	$ 950	$ 829	$ 2,727	$ 2,408

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