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Other assets - Components of Other Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Other real estate owned $ 457 $ 561
Investment in residential housing program 6,894 4,329
Mortgage servicing rights 514 676
Bank owned life insurance 30,575 29,983
Restricted equity securities 3,344 3,687
Other assets 14,816 13,830
Total $ 56,600 $ 53,066