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Summary of significant accounting policies (Details 4) (Mortgage servicing assets, Bank, USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mortgage servicing assets | Bank
      
Amortized intangible assets      
Gross carrying amount $ 25,644,000 $ 25,835,000  
Accumulated amortization (13,706,000) (14,519,000)  
Valuation allowance (251,000) (498,000) (175,000)
Net carrying value 11,687,000 10,818,000  
Changes in the valuation allowance for mortgage servicing assets      
Valuation allowance, balance at the beginning of the period 498,000 175,000 128,000
Provision (recovery) (60,000) 504,000 121,000
Other-than-temporary impairment (187,000) (181,000) (74,000)
Valuation allowance, balance at the end of the period 251,000 498,000 175,000
Estimated aggregate amortization expenses      
2014 1,600,000    
2015 1,400,000    
2016 1,300,000    
2017 1,100,000    
2018 1,000,000    
Assets acquired through the sale or securitization of loans held for sale 2,600,000 4,800,000 2,800,000
Amortization Expenses $ 1,800,000 $ 1,700,000 $ 1,100,000