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Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]                
Gain on sale of investments $ (15) $ (10) $ (17) $ (13)        
Gross unrealized losses 5,000   5,000     $ 14,414    
Cumulative OTTI charges 7,132 $ 13,974 7,132 $ 13,974 $ 7,132 13,974 $ 13,995 $ 13,995
Amortized Cost 840,352   840,352     855,521    
Securities available-for-sale $ 851,577   $ 851,577     $ 853,725    
Minimum [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Basis point spread on variable rate 1.60%   1.60%          
Minimum [Member] | Standard Poors [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Credit Quality Indicator Pricing 61.80   61.80          
Minimum [Member] | Moody Investor Service [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Credit Quality Indicator Pricing 18.07   18.07          
Maximum [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Basis point spread on variable rate 1.80%   1.80%          
Maximum [Member] | Standard Poors [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Credit Quality Indicator Pricing 65.41   65.41          
Maximum [Member] | Moody Investor Service [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Credit Quality Indicator Pricing 48.11   48.11