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Investment Securities (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]        
AFS securities pledged as collateral $ 342,200,000   $ 342,200,000  
Proceeds from sales     $ 392,841,000 $ 212,169,000
Gross realized gains on sale of securities 10,520,000 $ 4,400,000    
Gross realized losses on sale of securities 1,600,000 700,000    
Municipal securities        
Schedule of Available-for-sale Securities [Line Items]        
Proceeds from sales 39,100,000 52,000,000    
Gross realized gains on sale of securities 1,000,000 700,000    
Gross realized losses on sale of securities 600,000      
Available-for-sale Securities        
Schedule of Available-for-sale Securities [Line Items]        
Proceeds from sales $ 383,900,000 $ 208,400,000