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Securities (Other-than-temporary impairments) (Narrative) (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2012
USD ($)
security
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
security
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]              
OTTI write-downs included in earnings, available for sale debt securities $ 184,000       $ 0   $ 237,000
Total recorded as part of gross realized losses $ 981,000 $ 0   $ 0 0 $ 0 769,000
Number of investments with OTTI | security 3            
OTTI write-downs included in earnings, held to maturity debt securities $ 797,000           $ 716,000
Number of private label mortgage-backed securities | security             2
Reduction of non-credit related impairment related to security sales   0   0 (120,000) 0  
Carrying value of held to maturity securities     $ 4,400,000        
Realized gross gains (losses) on held to maturity securities         0    
Gross realized gains (losses) on sale of available for sale securities with OTTI write-downs           0  
Gross realized losses with OTTI write-downs   473,000   $ 709,000 1,155,000 $ 978,000  
Held-to-maturity Securities              
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]              
Credit related OTTI   0     0   $ 1,500,000
Non-credit OTTI   $ 0     0   40,000
Reduction of non-credit related impairment related to security sales             200,000
Mortgage Backed Securities              
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]              
OTTI write-downs included in earnings, available for sale debt securities             $ 53,000
Realized gross gains on carrying value of securities     89,000        
Realized gross gains (losses) on held to maturity securities     $ 439,000   0    
Gross realized losses with OTTI write-downs         $ 0