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Other assets - Components of Other Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Other assets.    
Other real estate owned $ 703 $ 957
Investment in residential housing program 8,431 6,744
Mortgage servicing rights 681 465
Bank owned life insurance 32,877 30,782
Restricted equity securities 6,911 5,403
Other assets 15,680 14,136
Total $ 65,283 $ 58,487