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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 17, 2018
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2012
Dec. 31, 2018
Loss Contingencies [Line Items]            
Operating lease rent expense   $ 1,200   $ 2,300    
Obligations for leases not yet commenced     $ 398      
Litigation Matters            
Federal Reserve Bank reserve balance requirements included in cash, cash equivalents and restricted cash   $ 10,915 9,709 $ 10,915    
Visa Inc.            
Litigation Matters            
Settlement agreement amount         $ 4,000,000  
Damages sought amended value $ 4,100,000          
Federal Reserve Bank reserve balance requirements included in cash, cash equivalents and restricted cash     $ 902,000      
Minimum            
Loss Contingencies [Line Items]            
Weighted average remaining term (in years)     1 year      
Finance lease, initial contract terms (in years)     3 years      
Maximum            
Loss Contingencies [Line Items]            
Weighted average remaining term (in years)     13 years      
Finance lease, initial contract terms (in years)     5 years      
Total commitments and standby letters of credit | Interest payable and other liabilities            
Loss Contingencies [Line Items]            
Allowance for off balance sheet commitments     $ 1,100     $ 958