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Stockholders' Equity - Stockholders’ Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Stockholders’ Equity and Regulatory Matters [Abstract]        
Accumulated other comprehensive income (loss) $ 7,155 $ 4,488 $ (1,832) $ 1,705
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments and Tax 15,592 5,255    
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 0 (424)    
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 6,605 2,048    
Other comprehensive income (loss) $ 8,987 $ 2,783