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Note 1 - Significant Accounting Policies (Details Textual)
3 Months Ended 4 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
shares
Mar. 31, 2020
USD ($)
Jun. 30, 2019
shares
Jul. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
shares
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       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 $ 42,800,000       $ 42,800,000         $ 5,000,000.0  
Servicing Asset, Total 846,000,000       846,000,000         727,000,000  
Goodwill, Impairment Loss   $ 0     0            
Percentage of Employees Working from Home to Total Employees               75.00%      
Financing Receivable, Advances under Paycheck Protection Program Liquidity Facility 0       0   $ 43,700,000        
Loans and Leases Receivable, Allowance, Ending Balance 32,246,000       32,246,000         23,889,000  
Retained Earnings (Accumulated Deficit), Ending Balance 118,239,000       118,239,000         $ 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
Accounting Standards Update 2016-13 [Member] | Scenario, Plan [Member]                      
Loans and Leases Receivable, Allowance, Ending Balance                 $ (1,000,000.0)    
Retained Earnings (Accumulated Deficit), Ending Balance                 $ 800,000    
SBA, CARES Act, Paycheck Protection Program [Member]                      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total $ 14,700,000       $ 14,700,000            
Core Deposits [Member]                      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)         10 years            
Subsequent Event [Member] | SBA, CARES Act, Paycheck Protection Program [Member]                      
Number of Loans Originated Under the Paycheck Protection Program       2,200              
Financing Receivable, before Allowance for Credit Loss, Total       $ 550,000,000              
Commercial Portfolio Segment [Member]                      
Financing Receivable, Payment Deferrals, Interest-only Amendments, Period (Day) 90 days                    
Financing Receivable, Payment Deferrals, Principal and Interest, Period (Day) 90 days                    
Financing Receivable, Payment Deferrals, Interest Rate 0.00%       0.00%            
Financing Receivable, Number of Interest Only Payment Deferrals 463       463            
Financing Receivable With Interest Only Deferred Payments $ 421,000,000       $ 421,000,000            
Financing Receivable, Number of Principal and Interest Payment Deferrals 242       242            
Financing Receivable With Principal and Interest Deferred Payments $ 298,000,000       $ 298,000,000            
Financing Receivable, Originated, Single Payment $ 8,100,000       $ 8,100,000            
Commercial Portfolio Segment [Member] | Subsequent Event [Member]                      
Financing Receivable, Number of Principal and Interest Payment Deferrals       21              
Financing Receivable With Principal and Interest Deferred Payments       $ 117,000,000              
Financing Receivable, Number of Interest Payment Deferrals       16              
Financing Receivable With Interest Deferred Payments       $ 31,000,000.0              
Financing Receivable With Principal and Interest Deferred Payments, Single Payment Loans       4,200,000              
Retail Portfolio Segment [Member]                      
Financing Receivable, Payment Deferrals, Principal and Interest, Period (Day) 90 days                    
Financing Receivable, Number of Principal and Interest Payment Deferrals 260       260            
Financing Receivable With Principal and Interest Deferred Payments $ 23,800,000       $ 23,800,000            
Retail Portfolio Segment [Member] | Subsequent Event [Member] | Maximum [Member]                      
Financing Receivable, Additional Principal and Interest Payment Deferments       $ 2,000,000.0              
Restricted Stock [Member]                      
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights (in shares) | shares 256,000   261,000   256,000 261,000          
Share-based Payment Arrangement, Option [Member]                      
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights (in shares) | shares 2,000   10,000   2,000 10,000          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares 9,000   7,000   9,000 7,000