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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) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Trust Preferred Securities [Member]        
Ending balance $ 7,444   $ 7,444  
Beginning balance     7,361  
Fair Value, Inputs, Level 3 [Member] | Trust Preferred Securities [Member]        
Ending balance 7,444 $ 7,167 7,444 $ 7,167
Changes in unrealized gains held at period end 2 2 2
Beginning balance 7,394 7,150 7,361 7,212
Net gain from fair value adjustment of financial assets [1] 48 15 81 (45)
Net loss from fair value adjustment of financial liabilities [1]
Decrease in accrued interest payable
Change in unrealized gains included in other comprehensive income 2 2 2
Fair Value, Inputs, Level 3 [Member] | Junior Subordinated Debentures [Member]        
Ending balance 35,137 27,485 35,137 27,485
Changes in unrealized gains held at period end
Beginning balance 34,536 27,977 33,959 29,018
Net gain from fair value adjustment of financial assets [1]
Net loss from fair value adjustment of financial liabilities [1] 594 (491) 1,165 (1,547)
Decrease in accrued interest payable 7 (1) 13 14
Change in unrealized gains included in other comprehensive income
[1] These totals in the tables above are presented in the Consolidated Statement of Income under net gains (losses) from fair value adjustments.