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Debt - Narrative (Details)
9 Months Ended
Oct. 12, 2018
USD ($)
Sep. 24, 2018
USD ($)
Jun. 21, 2018
USD ($)
Sep. 29, 2017
USD ($)
Sep. 30, 2019
USD ($)
debt_instrument
Sep. 30, 2018
USD ($)
Jun. 21, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                
Number of debt instruments | debt_instrument         3      
Loan origination fee         $ 0 $ 1,326,000    
Debt         33,743,000     $ 33,502,000
Senior Unsecured Notes                
Debt Instrument [Line Items]                
Debt         24,220,000     24,018,000
Senior Unsecured Notes | Senior Unsecured Notes                
Debt Instrument [Line Items]                
Face amount of debt $ 25,300,000       25,300,000.0      
Debt issued 3,300,000 $ 22,000,000            
Interest rate   6.75%            
Debt issuance costs         1,100,000      
Subordinated notes                
Debt Instrument [Line Items]                
Debt         9,523,000     9,484,000
Subordinated notes | Subordinated notes                
Debt Instrument [Line Items]                
Face amount of debt   $ 10,500,000.0   $ 30,000,000 10,500,000.0      
Debt repaid $ 19,500,000              
Call premium percentage   12.50%            
Loan origination fee   $ 105,000            
Debt term   20 years            
Debt issuance costs         1,000,000      
Derivative, basis spread on fixed rate       8.00%        
Subordinated notes | Swap rate | Subordinated notes                
Debt Instrument [Line Items]                
Debt term       5 years        
Line of credit                
Debt Instrument [Line Items]                
Borrowing capacity     $ 10,000,000.0   10,000,000.0   $ 10,000,000.0  
Debt         $ 0     $ 0
Line of credit | LIBOR                
Debt Instrument [Line Items]                
Variable interest rate     2.75%          
Debt Instrument, Redemption, Period One | Subordinated notes | Subordinated notes                
Debt Instrument [Line Items]                
Interest rate   7.50%            
Call premium   $ 1,100,000.0            
Debt Instrument, Redemption, Period Two | Subordinated notes | Subordinated notes                
Debt Instrument [Line Items]                
Interest rate   12.50%            
Call premium   $ 1,750,000.00            
Debt Instrument, Redemption, Period Three | Subordinated notes | Subordinated notes                
Debt Instrument [Line Items]                
Call premium   $ 3,050,000.00            
Period One | Subordinated notes | Swap rate | Subordinated notes                
Debt Instrument [Line Items]                
Derivative, basis spread on fixed rate       1250.00%        
Period Two | Subordinated notes | Swap rate | Subordinated notes                
Debt Instrument [Line Items]                
Derivative, basis spread on variable rate       1500.00%