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Accumulated Other Comprehensive Loss
9 Months Ended
Sep. 30, 2013
Accumulated Other Comprehensive Loss [Abstract]  
Accumulated Other Comprehensive Loss
NOTE 9. Accumulated Other Comprehensive Loss
                    
  The balances and changes in balances by component of accumulated other comprehensive income (loss) are shown in the following tables:
                    
            Unrealized    Accumulated
      Unrealized Gains (Losses) on Gains (Losses) Post- Other
      Investment securities on Cash Flow retirement Comprehensive
      With OTTI All other Hedges Benefits Loss
Balance, July 1, 2013$ (750) $ (414) $ (25,437) $ (39,321) $ (65,922)
 AOCI before reclassifications, net of tax  150   1,994   (2,434)  0   (290)
 Amounts reclassified from AOCI:              
  Interest expense 0  0  5,023  0  5,023
  Net realized loss (gain) on sales of securities 0  (2)  0  0  (2)
    Total before income taxes 0  (2)  5,023  0  5,021
    Less: Income taxes 0  1  (1,758)  0  (1,757)
     Net of income taxes 0  (1)  3,265  0  3,264
 Net change in AOCI  150   1,993   831  0  2,974
Balance, September 30, 2013$ (600) $ 1,579 $ (24,606) $ (39,321) $(62,948)
                    
Balance, July 1, 2012$ (1,461) $ 27,692 $ (35,883) $ (33,475) $ (43,127)
 AOCI before reclassifications, net of tax  86   13,355   (4,541)  0   8,900
 Sale of securities for which other-than-temporary              
  impairment was previously recognized, net of tax 0  0  0  0  0
 Amounts reclassified from AOCI:              
  Interest expense 0  0  4,434  0  4,434
  Net realized loss (gain) on sales of securities 0  (31)  0  0  (31)
    Total before income taxes 0  (31)  4,434  0  4,403
    Less: Income taxes 0  11  (1,552)  0  (1,541)
     Net of income taxes 0  (20)  2,882  0  2,862
 Net change in AOCI  86   13,335   (1,659)  0  11,762
Balance, September 30, 2012$ (1,375) $ 41,027 $ (37,542) $ (33,475) $(31,365)
                    
Balance, January 1, 2013$ (839) $ 37,521 $ (34,636) $ (39,304) $ (37,258)
 AOCI before reclassifications, net of tax  (76)   (35,660)   784  (17)   (34,969)
 Amounts reclassified from AOCI:              
  Interest expense 0  0  14,225  0  14,225
  Net realized loss (gain) on sales of securities 485  (434)  0  0  51
    Total before income taxes 485  (434)  14,225  0  14,276
    Less: Income taxes (170)  152  (4,979)  0  (4,997)
     Net of income taxes 315  (282)  9,246  0  9,279
 Net change in AOCI  239   (35,942)   10,030  (17)  (25,690)
Balance, September 30, 2013$ (600) $ 1,579 $ (24,606) $ (39,321) $(62,948)
                    
Balance, January 1, 2012$ (2,564) $ 23,388 $ (33,403) $ (33,475) $ (46,054)
 AOCI before reclassifications, net of tax  (1,826)   18,794   (12,643)  0   4,325
 Sale of securities for which other-than-temporary              
  impairment was previously recognized, net of tax  2,892  0  0  0  2,892
 Amounts reclassified from AOCI:              
  Interest expense 0  0  13,083  0  13,083
  Net realized loss (gain) on sales of securities 190  (1,823)  0  0  (1,633)
    Total before income taxes 190  (1,823)  13,083  0  11,450
    Less: Income taxes (67)  668  (4,579)  0  (3,978)
     Net of income taxes 123  (1,155)  8,504  0  7,472
 Net change in AOCI  1,189   17,639   (4,139)  0  14,689
Balance, September 30, 2012$ (1,375) $ 41,027 $ (37,542) $ (33,475) $(31,365)