Note 10 - Short-term Borrowings and Long-term FHLB Advances (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Short-term Debt $ 204,151 $ 94,167
Other Long-term Debt 189,742 254,863
Federal Home Loan Bank Stock 17,305 12,942
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available 1,220,000  
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds 886,000  
Federal Reserve Discount Window [Member]    
Federal Home Loan Bank Stock 17,300 12,900
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds 117,300  
Overnight Federal Funds [Member]    
Short-term Debt 30,000
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds 79,000  
Revolving Line of Credit with Correspondent Bank [Member]    
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds 5,000  
Convertible-fixed [Member]    
Other Long-term Debt $ 21,130 $ 21,251