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Other Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Other Assets [Line Items]    
Nonmarketable investment securities $ 1,707 $ 1,586
Accrued interest receivable 2,520 2,663
Deferred income taxes 14,362 15,744
Prepaid expenses 1,454 750
Other assets 6,223 6,419
Total $ 26,266 $ 27,162