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Note 5. Loans and Allowance for Credit Losses (Details Narrative)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Financing Receivable, Past Due [Line Items]          
Unamortized net deferred fees $ 24,500,000   $ 24,500,000   $ 26,500,000
Servicing Asset at Fair Value, Amount $ 102,900,000   $ 102,900,000   111,100,000
Loans secured by real estate (percent) 85.00%   85.00%    
Maximum loan to value (percent) 80.00%   80.00%    
Number of loans     10 14  
Financing Receivable, Troubled Debt Restructuring, Postmodification     $ 10,089,000 $ 18,268,000  
Number of loans - restructured accruing     7 10  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts   1 1 2  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default     $ 2,300,000 $ 937,000  
Financing Receivable, Troubled Debt Restructuring, Premodification   $ 2,400,000      
Collateral Sold [Member]          
Financing Receivable, Past Due [Line Items]          
Financing Receivable, Modifications, Number of Contracts 1        
Modified TDR loan paid off $ 309,000,000        
Performing Financial Instruments [Member]          
Financing Receivable, Past Due [Line Items]          
Financing Receivable, Troubled Debt Restructuring $ 8,600,000   $ 8,600,000   $ 24,000,000.0
Maximum [Member]          
Financing Receivable, Past Due [Line Items]          
Debt Service Coverage 1.15   1.15    
Minimum [Member]          
Financing Receivable, Past Due [Line Items]          
Debt Service Coverage 1.0   1.0    
Owner occupied And Commercial Real Estate [Member]          
Financing Receivable, Past Due [Line Items]          
Percent of loan portfolio 79.00%   79.00%    
Owner occupied And Commercial Real Estate [Member] | C And I Owner Occupied [Member]          
Financing Receivable, Past Due [Line Items]          
Percent of loan portfolio 14.00%   14.00%    
Non Owner Occupied Commercial Real Estate and Construction [Member]          
Financing Receivable, Past Due [Line Items]          
Percent of loan portfolio 65.00%   65.00%    
Commercial Portfolio Segment [Member]          
Financing Receivable, Past Due [Line Items]          
Percent of loan portfolio 19.00%   19.00%    
Term of Loans Underwritten     10 years    
Term Amortization Of Underwritten Loans     25 years    
Financing Receivable, Troubled Debt Restructuring, Postmodification     $ 2,419,000 5,665,000  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default        
Commercial Portfolio Segment [Member] | Maximum [Member]          
Financing Receivable, Past Due [Line Items]          
Debt Service Coverage 1.15   1.15    
Term of Loans Underwritten     7 years    
Commercial Portfolio Segment [Member] | Minimum [Member]          
Financing Receivable, Past Due [Line Items]          
Debt Service Coverage 1.0   1.0    
Term of Loans Underwritten     5 years    
Commercial Portfolio Segment [Member] | SBA Loans [Member]          
Financing Receivable, Past Due [Line Items]          
Percent of loan portfolio 2.00%   2.00%    
Home Equity Loans Lines Of Credit Other Consume Loans [Member]          
Financing Receivable, Past Due [Line Items]          
Percent of loan portfolio 1.00%   1.00%    
Residential Portfolio Segment [Member]          
Financing Receivable, Past Due [Line Items]          
Percent of loan portfolio 1.00%   1.00%    
Repricing period     22 months    
Commercial Land Acquisition Constructin Loans [Member]          
Financing Receivable, Past Due [Line Items]          
Term of Loans Underwritten     24 months    
A D C Loan Portfolio [Member]          
Financing Receivable, Past Due [Line Items]          
ADC real estate loans $ 1,660,000,000   $ 1,660,000,000    
Percent of ADC loan portfolio using interest reserves 71.00%   71.00%