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Subordinated Debentures And Notes (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Mar. 05, 2015
USD ($)
Debt Instrument [Line Items]      
Number of issuances of junior subordinated debentures | item 2    
Repurchase agreements $ 12,023,000  
Repurchase agreement amount, percentage   102.00%  
Subordinated Note [Member]      
Debt Instrument [Line Items]      
Subordinate notes bearing fixed interest rate 4.25%    
Interest rate period, in years 5 years    
Debt instrument, face amount     $ 9,750,000
Debt maturity date Mar. 06, 2025    
Subordinated Note [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 5.75%    
Subordinated Note [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 3.00%    
Prime Rate [Member] | Subordinated Note [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%    
DNB Capital Trust I [Member]      
Debt Instrument [Line Items]      
Issuance date Jul. 20, 2001    
Floating rate capital preferred securities $ 5,000,000    
LIBOR rate, borrowing period, in months 6 months    
Basis spread on variable rate 3.75%    
Fixed interest rate 12.00%    
Principal amount, floating rate junior subordinated debentures $ 5,155,000    
Maturity date range, start Jul. 25, 2006    
Maturity date range, end Jul. 25, 2031    
DNB Capital Trust II [Member]      
Debt Instrument [Line Items]      
Issuance date Mar. 30, 2005    
Floating rate capital preferred securities $ 4,000,000    
LIBOR rate, borrowing period, in months 3 months    
Basis spread on variable rate 1.77%    
Interest rate period, in years 5 years    
Principal amount, floating rate junior subordinated debentures $ 4,124,000    
Maturity date range, start May 23, 2010    
Maturity date range, end May 23, 2035    
Debt instrument fixed interest rate 6.56%