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Borrowings, Long-term Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Nov. 29, 2018
Apr. 02, 2007
Mar. 30, 2007
May 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Long-term debt [Abstract]              
Debt instrument, purchase price         $ 0 $ 1,440 $ 0
Gain on repurchase of debt instrument         0 560 $ 0
Junior Subordinated Debentures [Member]              
Long-term debt [Abstract]              
Issuance of debt     $ 61,341        
Long-term debt         $ 59,341 $ 59,341  
Interest rate on junior subordinated debentures 4.33%   6.52%        
Maturity date of junior subordinated debentures         Jun. 01, 2037    
Maturity period of debentures         30 years    
Period after which debentures are redeemable         5 years    
Repayment of debt   $ 61,341          
Debt instrument, repurchased face amount       $ 2,000      
Debt instrument, purchase price       1,440      
Gain on repurchase of debt instrument       $ 560      
Junior Subordinated Debentures [Member] | LIBOR Rate [Member]              
Long-term debt [Abstract]              
Term of variable rate         3 months    
Basis spread on variable rate 1.59%   1.59%        
Reference rate 2.74%            
Junior Subordinated Debentures [Member] | Subordinated Debentures 9.0% [Member]              
Long-term debt [Abstract]              
Interest rate on junior subordinated debentures   9.00%          
Junior Subordinated Debentures [Member] | Subordinated Debentures 8.25% [Member]              
Long-term debt [Abstract]              
Interest rate on junior subordinated debentures   8.25%          
Unconsolidated Delaware Statutory Trust Subsidiary [Member]              
Long-term debt [Abstract]              
Issuance of capital securities in a private placement     $ 59,500