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Note 13 - Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2015
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
December 31, 2015   Unrealized Gains
and (Losses) on
Available for Sale
Securities
  Defined Benefit
Pension Items
  Total
    (In thousands)
Beginning balance, net of tax   $ 3,392     $ (6,299 )   $ (2,907 )
Other comprehensive income (loss) before reclassifications, net of tax     (3,818 )     615       (3,203 )
                         
Amounts reclassified from accumulated other comprehensive income (loss), net of tax     (95 )     643       548  
                         
Net current period other comprehensive income (loss), net of tax     (3,913 )     1,258       (2,655 )
                         
Ending balance, net of tax   $ (521 )   $ (5,041 )   $ (5,562 )
December 31, 2014   Unrealized Gains
and (Losses) on
Available for Sale
Securities
  Defined Benefit
Pension Items
  Total
    (In thousands)
Beginning balance, net of tax   $ (8,522 )   $ (2,853 )   $ (11,375 )
Other comprehensive income (loss) before reclassifications, net of tax     13,548       (3,790 )     9,758  
                         
Amounts reclassified from accumulated other comprehensive income (loss), net of tax     (1,634 )     344       (1,290 )
                         
Net current period other comprehensive income (loss), net of tax     11,914       (3,446 )     8,468  
                         
Ending balance, net of tax   $ 3,392     $ (6,299 )   $ (2,907 )
December 31, 2013   Unrealized Gains
and (Losses) on
Available for Sale
Securities
  Defined Benefit
Pension Items
  Total
    (In thousands)
Beginning balance, net of tax   $ 18,921     $ (6,784 )   $ 12,137  
Other comprehensive income before reclassifications, net of tax     (26,541 )     3,261       (23,280 )
                         
Amounts reclassified from accumulated other comprehensive income, net of tax     (902 )     670       (232 )
                         
Net current period other comprehensive income, net of tax     (27,443 )     3,931       (23,512 )
                         
Ending balance, net of tax   $ (8,522 )   $ (2,853 )   $ (11,375 )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Details about Accumulated Other
Comprehensive Income Components
  Amounts Reclassified from
Accumulated Other
Comprehensive Income
  Affected Line Item in the Statement
Where Net Income is Presented
(Dollars in thousands)
Unrealized gains (losses) on available for sale securities:   $ 167      Net gain on sale of securities
      (72 )    Tax expense
    $ 95      Net of tax
             
             
Amortization of defined benefit pension items:            
Actuarial losses   $ (1,178 )(1)    Other operating expense
Prior service credits     46 (1)    Other operating expense
      (1,132 )   Total before tax
      489      Tax benefit
    $ (643 )    Net of tax
Details about Accumulated Other
Comprehensive Income Components
  Amounts Reclassified
from Accumulated Other
Comprehensive Income
  Affected Line Item in the Statement
Where Net Income is Presented
(Dollars in thousands)
Unrealized gains (losses) on available for sale securities:   $ 2,875      Net gain on sale of securities
      (1,241 )    Tax expense
    $ 1,634      Net of tax
             
             
Amortization of defined benefit pension items:            
Actuarial losses   $ (700 )(1)    Other operating expense
Prior service credits     45 (1)    Other operating expense
      (655 )   Total before tax
      311      Tax benefit
    $ (344 )    Net of tax
Details about Accumulated Other
Comprehensive Income Components
  Amounts Reclassified from
Accumulated Other
Comprehensive Income
  Affected Line Item in the Statement
Where Net Income is Presented
(Dollars in thousands)
Unrealized gains (losses) on available for sale securities:   $ 3,021      Net gain on sale of securities
      (1,321 )    Tax expense
    $ 1,700      Net of tax
             
             
OTTI charges   $ (1,419 )    OTTI charge
      621      Tax benefit
    $ (798 )    Net of tax
             
             
Amortization of defined benefit pension items:            
Actuarial losses   $ (1,237 )(1)    Other operating expense
Prior service credits     46 (1)    Other operating expense
      (1,191 )   Total before tax
      521      Tax benefit
    $ (670 )    Net of tax