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Guarantees (Changes in liabilty of estimated loss from credit recourse agreement) (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Movement In Guaranteed Benefit Liability Gross Roll Forward    
Balance at beginning of the period $ 439,000 $ 927,000
Net charge-off/terminations (258,000) (440,000)
Balance at the end of the period $ 181,000 $ 487,000