Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	225	59
Securities in an unrealized loss position less than 12 months fair value	$ 203,331	$ 52,886
Securities in an unrealized loss position less than 12 months unrealized losses	5,980	343
Securities in an unrealized loss position 12 months or longer fair value	13,441	1,881
Securities in an unrealized loss position 12 months or longer unrealized losses	1,901	1,650
Securities in an unrealized loss position fair value	216,772	54,767
Securities in an unrealized loss position unrealized losses	7,881	1,993
US Government Agencies Debt Securities [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	42	4
Securities in an unrealized loss position less than 12 months fair value	52,839	3,992
Securities in an unrealized loss position less than 12 months unrealized losses	1,309	19
Securities in an unrealized loss position 12 months or longer fair value	977
Securities in an unrealized loss position 12 months or longer unrealized losses	27
Securities in an unrealized loss position fair value	53,816	3,992
Securities in an unrealized loss position unrealized losses	1,336	19
State and Municipal [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	81	15
Securities in an unrealized loss position less than 12 months fair value	34,967	6,472
Securities in an unrealized loss position less than 12 months unrealized losses	1,270	91
Securities in an unrealized loss position 12 months or longer fair value	1,442
Securities in an unrealized loss position 12 months or longer unrealized losses	81
Securities in an unrealized loss position fair value	36,409	6,472
Securities in an unrealized loss position unrealized losses	1,351	91
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	46	9
Securities in an unrealized loss position less than 12 months fair value	67,691	13,439
Securities in an unrealized loss position less than 12 months unrealized losses	1,693	33
Securities in an unrealized loss position fair value	67,691	13,439
Securities in an unrealized loss position unrealized losses	1,693	33
Collateralized Mortgage Obligations [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	43	19
Securities in an unrealized loss position less than 12 months fair value	43,399	28,396
Securities in an unrealized loss position less than 12 months unrealized losses	1,639	155
Securities in an unrealized loss position 12 months or longer fair value	9,122
Securities in an unrealized loss position 12 months or longer unrealized losses	319
Securities in an unrealized loss position fair value	52,521	28,396
Securities in an unrealized loss position unrealized losses	1,958	155
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	1,772	1,609
Securities in an unrealized loss position 12 months or longer unrealized losses	1,446	1,608
Securities in an unrealized loss position fair value	1,772	1,609
Securities in an unrealized loss position unrealized losses	1,446	1,608
Corporate Debt Securities [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	4
Securities in an unrealized loss position less than 12 months fair value	3,989
Securities in an unrealized loss position less than 12 months unrealized losses	16
Securities in an unrealized loss position fair value	3,989
Securities in an unrealized loss position unrealized losses	16
Equity Securities [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	4	7
Securities in an unrealized loss position less than 12 months fair value	446	587
Securities in an unrealized loss position less than 12 months unrealized losses	53	45
Securities in an unrealized loss position 12 months or longer fair value	128	272
Securities in an unrealized loss position 12 months or longer unrealized losses	28	42
Securities in an unrealized loss position fair value	574	859
Securities in an unrealized loss position unrealized losses	$ 81	$ 87