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Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]        
Gain on sale of investments $ (2) $ (3)    
Gross unrealized losses 9,065   $ 14,414  
Cumulative OTTI charges 7,132 $ 13,995 13,974 $ 14,050
Amortized Cost 852,434   855,521  
Securities available-for-sale $ 855,681   $ 853,725  
Minimum [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Basis point spread on variable rate 1.60%      
Minimum [Member] | Standard Poors [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Credit Quality Indicator Pricing 59.4      
Minimum [Member] | Moody Investor Service [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Credit Quality Indicator Pricing 11.7      
Maximum [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Basis point spread on variable rate 1.80%      
Maximum [Member] | Standard Poors [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Credit Quality Indicator Pricing 64.1      
Maximum [Member] | Moody Investor Service [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Credit Quality Indicator Pricing 15.4