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Borrowings - Subordinated Debt (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2003
USD ($)
trust
Debt Instrument [Line Items]        
Net proceeds from sale of common stock $ 804 $ 1,196 $ 153,356  
Junior Subordinated Debentures        
Debt Instrument [Line Items]        
Number of separate trusts | trust       2
Preferred securities issued to form the trust $ 30 $ 30   $ 30,000
Junior Subordinated Debentures | Floating Rate Trust Preferred Securities Trust I        
Debt Instrument [Line Items]        
Preferred securities issued to form the trust       9,000
Proceeds from issuance of debt       9,280
Net proceeds from sale of common stock       280
Debt instrument, interest rate 5.19% 5.65%    
Junior Subordinated Debentures | Floating Rate Trust Preferred Securities Trust I | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate 3.25%      
Junior Subordinated Debentures | Floating Rate Trust Preferred Securities Trust II        
Debt Instrument [Line Items]        
Preferred securities issued to form the trust       21,000
Proceeds from issuance of debt       21,650
Net proceeds from sale of common stock       $ 650
Debt instrument, interest rate 5.10% 5.97%    
Junior Subordinated Debentures | Floating Rate Trust Preferred Securities Trust II | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate 3.15%