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Note 3. Investment Securities Available-for-Sale (Details Narrative) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Net Investment Income [Line Items]            
Federal Home Loan Bank Stock and Federal Reserve Bank Stock $ 28,725,000     $ 28,725,000   $ 23,506,000
Debt securities as percentage of total investment securities 99.90%     99.90%    
Debt securities weighted average duration       2 years 328 days 12 hours    
Available-for-sale Securities, Gross Realized Gains       $ 1,600,000 $ 93,000  
Noninterest Income $ 6,314,000   $ 5,640,000 18,965,000 16,497,000  
Available-for-sale Securities, Gross Realized Losses       20,000 25  
Proceeds from Sale of Available-for-sale Securities       $ 129,900,000 $ 42,100,000  
Holdings of securities of any one issuer 1000.00%     1000.00%    
Collateral Pledged [Member]            
Net Investment Income [Line Items]            
Available-for-sale securities pledged as collateral $ 439,400,000     $ 439,400,000   528,200,000
Interest Rate Swap [Member]            
Net Investment Income [Line Items]            
Noninterest Income   $ 829,000        
Equity Securities [Member]            
Net Investment Income [Line Items]            
Federal Home Loan Bank Stock and Federal Reserve Bank Stock $ 28,700,000     $ 28,700,000   $ 23,500,000