Note 7 -Securities in a Continuous Unrealized Loss Position (Details)	Sep. 30, 2016 USD ($) security	Dec. 31, 2015 USD ($) security
Schedule Of Available For Sale Securities [Line Items]
No. of securities | security	94	193
Securities in an unrealized loss position less than 12 months, fair value	$ 64,374,000	$ 176,786,000
Securities in an unrealized loss position less than 12 months, unrealized losses	(486,000)	(2,359,000)
Securities in an unrealized loss position 12 months or longer, fair value	19,829,000	36,124,000
Securities in an unrealized loss position 12 months or longer, unrealized losses	(1,248,000)	(2,022,000)
Securities in an unrealized loss position, fair value	84,203,000	212,910,000
Securities in an unrealized loss position, unrealized losses	$ (1,734,000)	$ (4,381,000)
US Government Agencies Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
No. of securities | security	15	32
Securities in an unrealized loss position less than 12 months, fair value	$ 20,918,000	$ 40,949,000
Securities in an unrealized loss position less than 12 months, unrealized losses	(98,000)	(418,000)
Securities in an unrealized loss position 12 months or longer, fair value		4,426,000
Securities in an unrealized loss position 12 months or longer, unrealized losses		(72,000)
Securities in an unrealized loss position, fair value	20,918,000	45,375,000
Securities in an unrealized loss position, unrealized losses	$ (98,000)	$ (490,000)
US States and Political Subdivisions Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
No. of securities | security	11	20
Securities in an unrealized loss position less than 12 months, fair value	$ 3,796,000	$ 6,646,000
Securities in an unrealized loss position less than 12 months, unrealized losses	(37,000)	(19,000)
Securities in an unrealized loss position 12 months or longer, fair value		1,555,000
Securities in an unrealized loss position 12 months or longer, unrealized losses		(12,000)
Securities in an unrealized loss position, fair value	3,796,000	8,201,000
Securities in an unrealized loss position, unrealized losses	$ (37,000)	$ (31,000)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule Of Available For Sale Securities [Line Items]
No. of securities | security	6	62
Securities in an unrealized loss position less than 12 months, fair value	$ 9,222,000	$ 90,796,000
Securities in an unrealized loss position less than 12 months, unrealized losses	(11,000)	(871,000)
Securities in an unrealized loss position 12 months or longer, fair value		1,403,000
Securities in an unrealized loss position 12 months or longer, unrealized losses		(49,000)
Securities in an unrealized loss position, fair value	9,222,000	92,199,000
Securities in an unrealized loss position, unrealized losses	$ (11,000)	$ (920,000)
Collateralized Mortgage Obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
No. of securities | security	38	49
Securities in an unrealized loss position less than 12 months, fair value	$ 27,179,000	$ 28,372,000
Securities in an unrealized loss position less than 12 months, unrealized losses	(100,000)	(261,000)
Securities in an unrealized loss position 12 months or longer, fair value	15,823,000	26,354,000
Securities in an unrealized loss position 12 months or longer, unrealized losses	(198,000)	(917,000)
Securities in an unrealized loss position, fair value	43,002,000	54,726,000
Securities in an unrealized loss position, unrealized losses	$ (298,000)	$ (1,178,000)
Collateralized Debt Obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
No. of securities | security	5	5
Securities in an unrealized loss position less than 12 months, fair value	$ 0	$ 0
Securities in an unrealized loss position less than 12 months, unrealized losses	0	0
Securities in an unrealized loss position 12 months or longer, fair value	1,938,000	2,193,000
Securities in an unrealized loss position 12 months or longer, unrealized losses	(950,000)	(897,000)
Securities in an unrealized loss position, fair value	1,938,000	2,193,000
Securities in an unrealized loss position, unrealized losses	$ (950,000)	$ (897,000)
Corporate Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
No. of securities | security	1	6
Securities in an unrealized loss position less than 12 months, fair value		$ 5,988,000
Securities in an unrealized loss position less than 12 months, unrealized losses		(95,000)
Securities in an unrealized loss position 12 months or longer, fair value	$ 1,003,000
Securities in an unrealized loss position 12 months or longer, unrealized losses	(8,000)
Securities in an unrealized loss position, fair value	1,003,000	5,988,000
Securities in an unrealized loss position, unrealized losses	$ (8,000)	$ (95,000)
Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
No. of securities | security	18	19
Securities in an unrealized loss position less than 12 months, fair value	$ 3,259,000	$ 4,035,000
Securities in an unrealized loss position less than 12 months, unrealized losses	(240,000)	(695,000)
Securities in an unrealized loss position 12 months or longer, fair value	1,065,000	193,000
Securities in an unrealized loss position 12 months or longer, unrealized losses	(92,000)	(75,000)
Securities in an unrealized loss position, fair value	4,324,000	4,228,000
Securities in an unrealized loss position, unrealized losses	$ (332,000)	$ (770,000)