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Accumulated Other Comprehensive Income, Reclassification of AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Realized gain on sale of securities $ 0 $ (371)  
Less provision for income taxes (1,188) (1,068)  
Reclassification adjustment, net of taxes 0   $ 712
Unrealized Gains and Losses on Available-for-Sale Securities [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification adjustment, net of taxes 0   $ 712
Unrealized Gains and Losses on Available-for-Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Realized gain on sale of securities 0 371  
Less provision for income taxes 0 126  
Reclassification adjustment, net of taxes $ 0 $ 245