Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	202	240
Securities in an unrealized loss position less than 12 months fair value	$ 153,672	$ 200,036
Securities in an unrealized loss position less than 12 months unrealized losses	(3,875)	(6,615)
Securities in an unrealized loss position 12 months or longer fair value	37,051	29,404
Securities in an unrealized loss position 12 months or longer unrealized losses	(3,026)	(3,001)
Securities in an unrealized loss position fair value	190,723	229,440
Securities in an unrealized loss position unrealized losses	(6,901)	(9,616)
US Government Agencies Debt Securities [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	39	44
Securities in an unrealized loss position less than 12 months fair value	46,532	54,563
Securities in an unrealized loss position less than 12 months unrealized losses	(1,011)	(1,548)
Securities in an unrealized loss position 12 months or longer fair value	1,894	2,846
Securities in an unrealized loss position 12 months or longer unrealized losses	(104)	(154)
Securities in an unrealized loss position fair value	48,426	57,409
Securities in an unrealized loss position unrealized losses	(1,115)	(1,702)
State and Municipal [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	69	87
Securities in an unrealized loss position less than 12 months fair value	24,514	33,750
Securities in an unrealized loss position less than 12 months unrealized losses	(641)	(1,379)
Securities in an unrealized loss position 12 months or longer fair value	5,441	4,288
Securities in an unrealized loss position 12 months or longer unrealized losses	(190)	(248)
Securities in an unrealized loss position fair value	29,955	38,038
Securities in an unrealized loss position unrealized losses	(831)	(1,627)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	42	54
Securities in an unrealized loss position less than 12 months fair value	56,621	75,720
Securities in an unrealized loss position less than 12 months unrealized losses	(1,560)	(2,238)
Securities in an unrealized loss position 12 months or longer fair value	1,893	1,884
Securities in an unrealized loss position 12 months or longer unrealized losses	(94)	(123)
Securities in an unrealized loss position fair value	58,514	77,604
Securities in an unrealized loss position unrealized losses	(1,654)	(2,361)
Collateralized Mortgage Obligations [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	41	45
Securities in an unrealized loss position less than 12 months fair value	23,271	33,622
Securities in an unrealized loss position less than 12 months unrealized losses	(633)	(1,413)
Securities in an unrealized loss position 12 months or longer fair value	26,007	18,567
Securities in an unrealized loss position 12 months or longer unrealized losses	(1,237)	(921)
Securities in an unrealized loss position fair value	49,278	52,189
Securities in an unrealized loss position unrealized losses	(1,870)	(2,334)
Pooled Trust Preferred Securities [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	5	5
Securities in an unrealized loss position 12 months or longer fair value	1,816	1,683
Securities in an unrealized loss position 12 months or longer unrealized losses	(1,401)	(1,535)
Securities in an unrealized loss position fair value	1,816	1,683
Securities in an unrealized loss position unrealized losses	(1,401)	(1,535)
Corporate Debt Securities [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	2	2
Securities in an unrealized loss position less than 12 months fair value	1,999	1,987
Securities in an unrealized loss position less than 12 months unrealized losses	(3)	(13)
Securities in an unrealized loss position fair value	1,999	1,987
Securities in an unrealized loss position unrealized losses	(3)	(13)
Equity Securities [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	4	3
Securities in an unrealized loss position less than 12 months fair value	735	394
Securities in an unrealized loss position less than 12 months unrealized losses	(27)	(24)
Securities in an unrealized loss position 12 months or longer fair value		136
Securities in an unrealized loss position 12 months or longer unrealized losses		(20)
Securities in an unrealized loss position fair value	735	530
Securities in an unrealized loss position unrealized losses	$ (27)	$ (44)