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Note 11 - Other Borrowings and Unused Line of Credit - Wholesale Structured Repurchase - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 12, 2019
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2019
Debt Instrument [Line Items]            
Aggregate principal amount     $ 40,210 $ 40,210    
FHLB term advances     30,323   $ 4,108  
Loss on prepayment of structured repurchase agreement   $ (50) (436)      
Net proceeds after deducting underwriting discount and estimated expenses $ 63,400   63,393      
Fixed rate 5.375%          
Loss on debt extinguishment, net   50 436      
Outstanding balance     9,000      
London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis points 282.00%          
Revolving line of credit            
Debt Instrument [Line Items]            
Line of credit   20,000       $ 10,000
Outstanding amount line of credit     $ 0      
Revolving line of credit | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis points     2.25%      
Term Notes Member | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis points       3.00%    
Wholesale structured repurchase agreements            
Debt Instrument [Line Items]            
Repayments of debt   10,000        
First wholesale structured repurchase agreements            
Debt Instrument [Line Items]            
Aggregate principal amount   $ 5,000        
Fixed rate   2.58%        
Second wholesale structured repurchase agreements            
Debt Instrument [Line Items]            
Aggregate principal amount   $ 20,000        
Fixed rate   2.46%