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Note 10 - Fair Value of Financial Instruments - Assets and Liabilities Carried at Fair Value on a Recurring Basis, Classified Within Level 3 of the Valuation Hierarchy (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Trust Preferred Securities [Member]    
Beginning balance $ 1,110 $ 7,361
Net gain from fair value adjustment of financial assets [1] 51 32
Net loss from fair value adjustment of financial liabilities [1]
Increase in accrued interest receivable 1
Increase in accrued interest payable
Change in unrealized gains included in other comprehensive income 1
Ending balance 1,162 7,394
Changes in unrealized gains held at period end 1
Junior Subordinated Debentures [Member]    
Beginning balance 36,986 33,959
Net gain from fair value adjustment of financial assets [1]
Net loss from fair value adjustment of financial liabilities [1] 1,681 570
Increase in accrued interest receivable
Increase in accrued interest payable 25 7
Change in unrealized gains included in other comprehensive income
Ending balance 38,692 34,536
Changes in unrealized gains held at period end
[1] Totals in the table above are presented in the Consolidated Statement of Income under net gains (losses) from fair value adjustments.