Note 10 - Borrowed Funds (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Summary of Comparative Data of Securities Sold Under Agreements to Repurchase [Table Text Block]

	2015			2014			2013
	(Dollars in thousands)
Average amount outstanding during the year (1)	$	400,822		$	629,315		$	972,329
Maximum amount outstanding at month-end (2)		400,000			700,000			1,200,000
Balance, December 31		400,000			450,000			800,000
Rate, December 31		3.89	%		3.85	%		3.87	%
Weighted average interest rate for the year		3.95	%		3.92	%		3.88	%