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Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Available-for-sale securities        
Impairment losses recognized in earnings on other-than-temporarily impaired securities $ 248 $ 182 $ 248 $ 182
Non-credit-related losses other-than-temporary impairment on available-for-sale securities 317 240 317 240
Impairment losses recognized in other comprehensive income for securities held- to-maturity 0 0 0 0
Total debt securities
       
Credit related other-than-temporary impairment recognized in earnings        
Balance, beginning of period 4,549 3,676 4,549 16,486
Subsequent credit-related impairment 248 182 248 182
Reduction for securities sold or redeemed (2,402)   (2,402) (12,761)
Reduction for increase in expected cash flows on securities for which OTTI was previously recognized   (204)   (253)
Balance, end of period $ 2,395 $ 3,654 $ 2,395 $ 3,654