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Basis of Presentation (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax $ 4,327 $ 1,786 $ 5,067 $ 7,620  
Other Tax Expense (Benefit) 1,514 $ 625 1,773 $ 2,667  
Other Assets 305,888   305,888   $ 292,139
Assets, Total 10,466,302   10,466,302   10,056,972
Long-term debt 247,083   247,083   246,975
Liabilities, Total 9,048,967   9,048,967   8,792,311
Liabilities and Equity, Total $ 10,466,302   $ 10,466,302   10,056,972
Effect of Change [Member]          
Other Assets         (2,371)
Assets, Total         (2,371)
Long-term debt         (2,371)
Liabilities, Total         (2,371)
Liabilities and Equity, Total         $ (2,371)