Note 10 - Borrowed Funds (Details) (USD $)	12 Months Ended																		1 Months Ended	12 Months Ended	1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2005	Dec. 31, 2004	May 31, 2011	Dec. 31, 2011 Federal Funds Purchased [Member]	Dec. 31, 2013 Securities Sold under Agreements to Repurchase [Member]	Dec. 31, 2012 Securities Sold under Agreements to Repurchase [Member]	Dec. 31, 2011 Securities Sold under Agreements to Repurchase [Member]	Dec. 31, 2012 Terms Modified in Current Year [Member]	Dec. 31, 2012 Floating to Fixed Rate Agreements Totaling $400 Million [Member]	Dec. 31, 2013 Floating to Fixed Rate Agreements Totaling $400 Million [Member] Minimum [Member]	Dec. 31, 2013 Floating to Fixed Rate Agreements Totaling $400 Million [Member] Maximum [Member]	Dec. 31, 2013 Federal Home Loan Bank Advances [Member]	Dec. 31, 2012 Federal Home Loan Bank Advances [Member]	Dec. 31, 2012 Floating to Fixed Rate Agreements Totaling $400 Million [Member]	Dec. 31, 2013 Callable Securities [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Maximum [Member]
Note 10 - Borrowed Funds (Details) [Line Items]
Federal Funds Purchased	$ 0	$ 0	$ 27,000
Debt Instrument, Interest Rate, Stated Percentage							1.29%						4.78%	5.07%					8.00%	8.00%
Securities Sold under Agreements to Repurchase	800,000,000	1,250,000,000									200,000,000							600,000,000
								3.87%	3.84%	4.14%
Prepaid Security Sold Under Repurchase Agreement	450,000,000	150,000,000				50,000,000
Rate of Prepaid Security Sold Under Repurchase Agreements	3.79%	4.43%				4.83%
Prepayment Penalty Security Sold Under Agreements To Repurchase	22,600,000	9,400,000				1,700,000
Average Rate Reduction on Modified Repurchase Agreements (in Basis Points)		1.68%
Number Of Floating-To-Fixed Rate Agreements												5
Total Floating To Fixed Rate												300,000,000
Floating Interest Rate, Range of Time Period																				6 months	1 year
LIBOR Minus Hundred Basis Point																	LIBOR rate minus 200
LIBOR Minus Three Hundred and Forty Basis Points												LIBOR rate minus 340
Number Of Fixed-To-Floating Security Sold Under Agreements To Repurchase	6
Total Fixed To Floating Rate Agreements	300,000,000
Minimum Initial Fixed Rate	1.00%
Maximum Initial Fixed Rate	3.50%
Fixed Interest Rate, Range of Time Period																			6 years		12 months
Debt Instrument, Basis Spread on Variable Rate																			3.50%		3.75%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum		0.00%
Investment Securities Pledged As Collateral								906,100,000	1,400,000,000
Advances from Federal Home Loan Bank	521,200,000	146,200,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Weighted Average Interest Rate															0.17%	0.44%
Federal Home Loan Bank Prepaid Advances		100,000,000
Weighted Average Rate for Prepaying Federal Home Loan Bank Advances		4.60%
Prepayment Fees on Advances, Net		2,800,000
Threshold for Deferred Bonus				225,000
AmountOfDeferredBonusAccruedInOtherLiabilities					610,000
Accrued Interest On Deferred Bonus		7.00%
Debt Instrument Basis Spread (in Basis Points)		2.75%
Interest Expense, Other	77,000	71,000	67,000
Accrued Bonuses	$ 1,100,000	$ 1,100,000