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Note 1 - Significant Accounting Policies (Details Textual)
3 Months Ended
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2019
shares
Jun. 30, 2020
Apr. 30, 2020
USD ($)
Mar. 23, 2020
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Number of Unconsolidated Business Trusts Formed to Issue Trust Preferred Securities 5              
Interest Income on Commercial and Mortgage Loans Discontinued Period (Day) 90 days              
Maximum Delinquency Period for Consumer and Credit Card Loans to be Charged Off (Day) 120 days              
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance, Ending Balance $ 24,700,000           $ 5,000,000  
Servicing Asset, Total 742,000,000           727,000,000  
Goodwill, Impairment Loss 0              
Percentage of Employees Working from Home to Total Employees         75.00%      
Loans and Leases Receivable, Allowance, Ending Balance 24,828,000           23,889,000  
Retained Earnings (Accumulated Deficit), Ending Balance $ 114,012,000           $ 107,831,000  
Accounting Standards Update 2016-02 [Member]                
Operating Lease, Right-of-Use Asset               $ 1,300,000
Operating Lease, Liability, Total               $ 1,300,000
Forecast [Member] | Minimum [Member]                
Financing Receivable, Percentage of PPLF Advances to Total PPP Loans     90.00%          
Forecast [Member] | Maximum [Member]                
Financing Receivable, Percentage of PPLF Advances to Total PPP Loans     100.00%          
Scenario, Plan [Member] | Accounting Standards Update 2016-13 [Member]                
Loans and Leases Receivable, Allowance, Ending Balance           $ (1,000,000)    
Retained Earnings (Accumulated Deficit), Ending Balance           $ 800,000    
Core Deposits [Member]                
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year) 10 years              
Subsequent Event [Member]                
Number of Loans Originated Under the Paycheck Protection Program       1,750        
Loans Originated Under the Paycheck Protection Program, Amount       $ 523,000,000        
Financing Receivable, Advances under Paycheck Protection Program Liquidity Facility       $ 43,700,000        
Commercial Portfolio Segment [Member] | Subsequent Event [Member]                
Financing Receivable, Number of Interest Only Payment Deferrals       400        
Financing Receivable With Interest Only Deferred Payments       $ 342,000,000        
Financing Receivable, Number of Principal and Interest Payment Deferrals       125        
Financing Receivable, Principal and Interest Deferred Payments       $ 247,000,000        
Financing Receivable, Principal and Interest Deferred Payments with Single Payments       $ 5,400,000        
Retail Portfolio Segment [Member] | Subsequent Event [Member]                
Financing Receivable, Number of Principal and Interest Payment Deferrals       300        
Financing Receivable, Principal and Interest Deferred Payments       $ 34,000,000        
Restricted Stock [Member]                
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights (in shares) | shares 256,000 263,000            
Share-based Payment Arrangement, Option [Member]                
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights (in shares) | shares 4,000 12,000            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares 7,000 7,000