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Investment Securities (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-Sale and Held-to-Maturity Securities [Line Items]    
General obligation bonds, fair value $ 10,000  
Number of states with aggregate fair value of general obligation bonds greater than $10 million 11  
Total number of states general obligation bonds are held 37  
Maximum portfolio concentration in municipal securities per corporate investment policy 20.00%  
Amount of municipal securities with a combined individual state to total municipal outstanding equal to or less than, per corporate policy 25.00%  
Other investment securities pledged $ 2,900,000 $ 2,800,000
Available for sale securities, net unrealized losses (53,000) (44,900)
Unrealized Gain (Loss) on Investments $ (100,400) (102,400)
Number of Single Issuer Trust Preferred Securities With Stated Maturities 8  
Percent of trust preferred securities included in fair value of entire investment portfolio 1.00%  
Available-for-sale $ 3,967,735 3,545,288
Collateralized Loan Obligations    
Schedule of Available-for-Sale and Held-to-Maturity Securities [Line Items]    
Available-for-sale 289,411 $ 287,844
Unrealized loss position $ 8,400