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Investment Securities Unrealized losses and fair value of securities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Total mortgage-backed securities AFS
    
Gain (Loss) on Investments [Line Items]    
Total Fair Value AFS $ 25,419 $ 13,699
AFS Amortized Cost 44,090 45,782
AFS unrealized losses less than 12 months (241) (25)
AFS Fair Value less than 12 months 25,419 13,699
AFS unrealized losses 12 months of longer 0 0
AFS Fair Value 12 months or longer 0 0
AFS Gross Unrealized Losses (241) (25)
US Government Agency Securities
    
Gain (Loss) on Investments [Line Items]    
Total Fair Value AFS 16,954 9,917
AFS Amortized Cost 30,976 23,176
AFS unrealized losses less than 12 months (40) (63)
AFS Fair Value less than 12 months 16,954 9,917
AFS unrealized losses 12 months of longer 0 0
AFS Fair Value 12 months or longer 0 0
AFS Gross Unrealized Losses (40) (63)
Treasuries
    
Gain (Loss) on Investments [Line Items]    
Total Fair Value AFS 1,554 1,555
AFS unrealized losses less than 12 months (1) (1)
AFS Fair Value less than 12 months 1,554 1,555
AFS unrealized losses 12 months of longer 0 0
AFS Fair Value 12 months or longer 0 0
AFS Gross Unrealized Losses (1) (1)
Other
    
Gain (Loss) on Investments [Line Items]    
Total Fair Value AFS   9,973
AFS Amortized Cost 10,485 10,536
AFS unrealized losses less than 12 months   (27)
AFS Fair Value less than 12 months   9,973
AFS unrealized losses 12 months of longer   0
AFS Fair Value 12 months or longer   0
AFS Gross Unrealized Losses 0 (27)
Held-to-maturity securities
    
Gain (Loss) on Investments [Line Items]    
Total Fair Value AFS 43,927 35,144
AFS unrealized losses less than 12 months (282) (116)
AFS Fair Value less than 12 months 43,927 35,144
AFS unrealized losses 12 months of longer 0 0
AFS Fair Value 12 months or longer 0 0
AFS Gross Unrealized Losses $ (282) $ (116)