Bank subsidiary (Details 4) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Repurchase agreements
Gross amount of recognized liabilities	$ 145,000,000	$ 145,000,000
Net amount of liabilities presented in the Balance Sheet	145,000,000	145,000,000
Gross amount not offset in the Balance Sheet
Net amount of liabilities presented in the Balance Sheet	145,000,000	145,000,000
Financial instruments	145,000,000	145,000,000
American Savings Bank (ASB)
Repurchase agreements
Net amount of liabilities presented in the Balance Sheet	50,000,000	51,000,000
Gross amount not offset in the Balance Sheet
Net amount of liabilities presented in the Balance Sheet	50,000,000	51,000,000
Financial instruments	50,000,000	51,000,000
Commercial account holders
Repurchase agreements
Net amount of liabilities presented in the Balance Sheet	95,000,000	94,000,000
Gross amount not offset in the Balance Sheet
Net amount of liabilities presented in the Balance Sheet	95,000,000	94,000,000
Financial instruments	$ 95,000,000	$ 94,000,000