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Borrowings Subordinated Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Subordinated Debt $ 84,299 $ 34,728
Subordinated note due 2029 [Member]    
Debt Instrument [Line Items]    
Subordinated Debt $ 50,000  
Subordinated Debt [Member] | Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.75%  
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.15%