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Securities (Other-than-temporary impairments) (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2012
USD ($)
security
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
security
Investments, Debt and Equity Securities [Abstract]        
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
Gross realized gains (losses) on sale of available for sale securities with OTTI write-downs   $ 0    
Carrying value of held to maturity securities   4,400,000    
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
Gross realized losses with OTTI write-downs   682,000 $ 269,000  
Realized gross gains (losses) on held to maturity securities   0    
Recorded as part of gross realized losses:        
Credit related OTTI   0 0  
Intent to sell OTTI   0 0  
Total recorded as part of gross realized losses $ 981,000 0 0 769,000
Recorded directly to AOCI for non-credit related impairment:        
Residential mortgage backed securities   0 0  
Reduction of non-credit related impairment related to security sales   (120,000) 0  
Accretion of non-credit related impairment   (7,000) (24,000)  
Total changes to AOCI for non-credit related impairment   (127,000) (24,000)  
Total OTTI losses (accretion) recorded on debt securities, net   (127,000) $ (24,000)  
Held-to-maturity Securities        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Credit related OTTI   0   1,500,000
Non-credit related OTTI   0   40,000
Recorded directly to AOCI for non-credit related impairment:        
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    
Gross realized losses with OTTI write-downs   85,000    
Realized gross gains (losses) on held to maturity securities   $ 439,000