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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 17, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2012
Dec. 31, 2018
Loss Contingencies [Line Items]          
Operating lease rent expense     $ 1,000    
Litigation Matters          
Federal Reserve Bank reserve balance requirements included in cash and due from banks   $ 10,932 $ 18,183    
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 and due from banks   $ 900,000      
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   $ 1,087     $ 958