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Bank segment - Troubled debt restructuring - narrative (Details) - Jun. 30, 2015 - USD ($)
$ in Millions
Total
Land loans  
Troubled debt restructurings  
Period of interest-only monthly payment term loan 3 years
Land loans | Maximum  
Troubled debt restructurings  
Extension of maturity date 5 years
Troubled debt restructurings real estate loans  
Troubled debt restructurings  
Financing receivable modifications minimum, period of payment default of loans determined to be TDRs 90 days
Commitments to lend additional funds to borrows with impaired or modified loans $ 0.1