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Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Jun. 30, 2015
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]          
Gain on sale of investments $ (3) $ (4)      
Gross unrealized losses 3,001   $ 6,719    
Cumulative OTTI charges 13,995 $ 13,995   $ 13,995 $ 14,050
Amortized Cost 863,376   876,796    
Securities available-for-sale $ 884,176   $ 891,082    
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 41.0        
Minimum [Member] | Moody Investor Service [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Credit Quality Indicator Pricing 7.0        
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 56.7        
Maximum [Member] | Moody Investor Service [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Credit Quality Indicator Pricing 15.4