Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Loans (Details Textual)

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Note 5 - Loans (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Termination of Loan Guaratee, Close-out Payment $ 7,400      
Percentage of Fee on Commitment Balance 1.00% 1.00%    
Loans and Leases Receivable, Net Amount, Total $ 6,944,877 $ 6,944,877   $ 6,464,899 [1]
Financing Receivable, Troubled Debt Restructuring 11,200 11,200 $ 16,600 14,600
Financing Receivable, Troubled Debt Restructuring, Accruing 3,500 3,500 15,500 3,100
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down   1,800 $ 3,700 $ 4,300
Loans Formerly Enrolled In Loan Guarantee Program [Member]        
Loans and Leases Receivable, Net Amount, Total 44,300 44,300    
Loans Formerly Enrolled In Loan Guarantee Program [Member] | Pass [Member]        
Loans and Leases Receivable, Net Amount, Total 37,800 37,800    
Loans Formerly Enrolled In Loan Guarantee Program [Member] | Special Mention [Member]        
Loans and Leases Receivable, Net Amount, Total 5,200 5,200    
Loans Formerly Enrolled In Loan Guarantee Program [Member] | Substandard [Member]        
Loans and Leases Receivable, Net Amount, Total $ 1,300 $ 1,300    
[1] Derived from audited financial statements.