Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	198	240
Securities in an unrealized loss position less than 12 months, fair value	$ 70,299	$ 200,036
Securities in an unrealized loss position less than 12 months, unrealized losses	(420)	(6,615)
Securities in an unrealized loss position 12 months or longer, fair value	129,404	29,404
Securities in an unrealized loss position 12 months or longer, unrealized losses	(4,702)	(3,001)
Securities in an unrealized loss position, fair value	199,703	229,440
Securities in an unrealized loss position, unrealized losses	(5,122)	(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	36	44
Securities in an unrealized loss position less than 12 months, fair value	15,539	54,563
Securities in an unrealized loss position less than 12 months, unrealized losses	(49)	(1,548)
Securities in an unrealized loss position 12 months or longer, fair value	27,668	2,846
Securities in an unrealized loss position 12 months or longer, unrealized losses	(719)	(154)
Securities in an unrealized loss position, fair value	43,207	57,409
Securities in an unrealized loss position, unrealized losses	(768)	(1,702)
US States and Political Subdivisions Debt Securities [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	49	87
Securities in an unrealized loss position less than 12 months, fair value	5,772	33,750
Securities in an unrealized loss position less than 12 months, unrealized losses	(22)	(1,379)
Securities in an unrealized loss position 12 months or longer, fair value	15,078	4,288
Securities in an unrealized loss position 12 months or longer, unrealized losses	(198)	(248)
Securities in an unrealized loss position, fair value	20,850	38,038
Securities in an unrealized loss position, unrealized losses	(220)	(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	55	54
Securities in an unrealized loss position less than 12 months, fair value	31,717	75,720
Securities in an unrealized loss position less than 12 months, unrealized losses	(162)	(2,238)
Securities in an unrealized loss position 12 months or longer, fair value	43,761	1,884
Securities in an unrealized loss position 12 months or longer, unrealized losses	(958)	(123)
Securities in an unrealized loss position, fair value	75,478	77,604
Securities in an unrealized loss position, unrealized losses	(1,120)	(2,361)
Collateralized Mortgage Obligations [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	49	45
Securities in an unrealized loss position less than 12 months, fair value	16,313	33,622
Securities in an unrealized loss position less than 12 months, unrealized losses	(127)	(1,413)
Securities in an unrealized loss position 12 months or longer, fair value	40,903	18,567
Securities in an unrealized loss position 12 months or longer, unrealized losses	(1,603)	(921)
Securities in an unrealized loss position, fair value	57,216	52,189
Securities in an unrealized loss position, unrealized losses	(1,730)	(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	1,994	1,683
Securities in an unrealized loss position 12 months or longer, unrealized losses	(1,224)	(1,535)
Securities in an unrealized loss position, fair value	1,994	1,683
Securities in an unrealized loss position, unrealized losses	(1,224)	(1,535)
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	958	394
Securities in an unrealized loss position less than 12 months, unrealized losses	(60)	(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	958	530
Securities in an unrealized loss position, unrealized losses	(60)	(44)
Corporate Debt Securities [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities		2
Securities in an unrealized loss position less than 12 months, fair value		1,987
Securities in an unrealized loss position less than 12 months, unrealized losses		(13)
Securities in an unrealized loss position, fair value		1,987
Securities in an unrealized loss position, unrealized losses		$ (13)