Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Fair Value Measurement (Details Textual)

v3.20.2
Note 11 - Fair Value Measurement (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Securities, Available-for-sale, Total $ 913,049,000   $ 913,049,000   $ 759,399,000 [1]
Asset Impairment Charges, Total 11,200,000 $ 7,700,000 20,000,000.0 $ 16,100,000  
Real Estate Owned, Amount of Loss at Acquisition $ 86,000 $ 58,000 2,500,000 $ 282,000  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Foreclosure     $ 0   $ 103,000
Minimum [Member]          
Impaired Loans, Fair Value Adjustment, Percent 0.00%   0.00%   0.00%
Real Estate Owned, Fair Value Adjustment, Percent 5.00%   5.00%   5.00%
Minimum [Member] | Measurement Input, Cost to Sell [Member]          
Impaired Loans, Measurement Input 0.08   0.08    
Maximum [Member]          
Impaired Loans, Fair Value Adjustment, Percent 50.00%   50.00%   30.00%
Real Estate Owned, Fair Value Adjustment, Percent 46.00%   46.00%   10.00%
Maximum [Member] | Measurement Input, Cost to Sell [Member]          
Impaired Loans, Measurement Input 0.10   0.10    
Weighted Average [Member]          
Impaired Loans, Fair Value Adjustment, Percent 17.10%   17.10%   5.60%
Real Estate Owned, Fair Value Adjustment, Percent 10.70%   10.70%   8.00%
Corporate Debt Securities [Member]          
Number of Available-for-sale Debt Securities Acquired     2    
Debt Securities, Available-for-sale, Total $ 322,632,000   $ 322,632,000   $ 160,477,000
Corporate Debt Securities [Member] | Minimum [Member]          
Debt Securities, Available-for-sale, Total 87.6222   87.6222   98,783,600
Corporate Debt Securities [Member] | Maximum [Member]          
Debt Securities, Available-for-sale, Total 116.1915   116.1915   102,264,800
Corporate Debt Securities [Member] | Weighted Average [Member]          
Debt Securities, Available-for-sale, Total $ 104.0924   $ 104.0924   $ 112,230,500
[1] Derived from audited financial statements.