Note 2 - Comprehensive Income (Details) - Components of Other Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Change in net unrealized holding gains on available-for-sale securities:
Change arising during the period		$ 5,144	$ 99	$ (592)	$ 17,881
Reclassification adjustment for gains included in net income (1)	[1]		(1)	(1,125)	(22)
Change in net unrealized holding gains on available-for-sale securities		$ 5,144	98	(1,717)	17,859
Tax effect		2,119	40	(706)	7,295
		$ 3,025	58	(1,011)	10,564
Change in funded status of pension plan:
Amortization of prior service cost included in pension expense (2)	[2]		4	0	11
Tax effect			2	(37)	(13)
			2	37	24
Other comprehensive income (loss)		$ 3,025	$ 60	$ (974)	$ 10,588

[1] Reclassification adjustment represents net realized gains arising from the sale of available-for-sale securities. The net realized gains are included in the consolidated statements of income in the line item, "Net gains on sales of securities." See "Note 3 - Investment Securities" for the income tax expense related to the net realized gains.

[2] Represents the amortization into expense of prior service cost relating to the Bank's defined benefit pension plan. This item is included in net periodic pension cost (see Note 6) and in the consolidated statements of income in the line item, "Employee benefits." The related income tax expense is included in the consolidated statements of income in the line item, "Income tax expense."