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Other assets - Components of Other Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Other assets.    
Other real estate owned $ 1,353 $ 957
Investment in residential housing program 8,550 6,744
Mortgage servicing rights 489 465
Bank owned life insurance 32,677 30,782
Restricted equity securities 6,878 5,403
Other assets 15,306 14,136
Total $ 65,253 $ 58,487