Note 10 - Borrowed Funds (Tables)

12 Months Ended

Dec. 31, 2014

Note 10 - Borrowed Funds (Tables) [Line Items]

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

	2014			2013			2012
	(Dollars in thousands)
Average amount outstanding during the year (1)	$	629,315		$	972,329		$	1,361,475
Maximum amount outstanding at month-end (2)		700,000			1,200,000			1,400,000
Balance, December 31		450,000			800,000			1,250,000
Rate, December 31		3.85	%		3.87	%		3.84	%
Weighted average interest rate for the year		3.92	%		3.88	%		4.09	%

Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank [Table Text Block]

	2014					2013
	Amount		Weighted Average			Amount		Weighted Average
Maturity	(In thousands)		Interest Rate			(In thousands)		Interest Rate
Within 90 days	$	400,000		0.27	%	$	475,000		0.06	%
4 - 5 years		25,000		1.13	%		46,200		1.24	%
Total	$	425,000		0.32	%	$	521,200		0.17	%

Callable Securities [Member]

Note 10 - Borrowed Funds (Tables) [Line Items]

Schedule of Repurchase Agreements [Table Text Block]

(Dollars in millions)	Fixed-to-floating			Floating-to-fixed			Total
Rate type	Float Rate			Fixed Rate
Rate index	8% minus 3 month LIBOR
Maximum rate		3.50	%
Minimum rate		0.0	%
No. of agreements		1			4			5
Amount	$	50.0		$	200.0		$	250.0
Weighted average rate		3.50	%		5.00	%		4.70	%
Final maturity	2015			2017

Non Callable Fixed Rate Securities [Member]

Note 10 - Borrowed Funds (Tables) [Line Items]

Schedule of Repurchase Agreements [Table Text Block]

	No. of		Amount		Weighted Average
Maturity	Agreements		(In thousands)		Interest Rate
1 year to 3 years		2	$	100,000		2.71	%
3 years to 5 years		2		100,000		2.86	%
Total		4	$	200,000		2.78	%