Note 3 - Investment Securities (Tables)

6 Months Ended

Jun. 30, 2013

Investments, Debt and Equity Securities [Abstract]

Investment [Table Text Block]

	June 30, 2013									December 31, 2012
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Held-to-Maturity
U.S. Government agencies	$	313,050	$	33	$	(8,322	)	$	304,761	$	288,098	$	135	$	(679	)	$	287,554
Mortgage-backed securities		43		2		--			45		49		1		--			50
State and political subdivisions		241,751		2,097		(6,120	)		237,728		207,374		5,140		(160	)		212,354
Other securities		620		--		--			620		620		--		--			620
Total HTM	$	555,464	$	2,132	$	(14,442	)	$	543,154	$	496,141	$	5,276	$	(839	)	$	500,578
Available-for-Sale
U.S. Government agencies	$	163,989	$	--	$	(4,599	)	$	159,390	$	152,708	$	65	$	(292	)	$	152,481
Mortgage-backed securities		1,898		180		--			2,078		20,436		287		(89	)		20,634
State and political subdivisions		1,272		1		(11	)		1,262		2,989		--		(1	)		2,988
Other securities		14,337		464		--			14,801		14,787		456		(4	)		15,239
Total AFS	$	181,496	$	645	$	(4,610	)	$	177,531	$	190,920	$	808	$	(386	)	$	191,342

Schedule of Unrealized Loss on Investments [Table Text Block]

	Less Than 12 Months					12 Months or More					Total
(In thousands)	Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses
Held-to-Maturity
U.S. Government agencies	$	299,727	$	(8,322	)	$	--	$	--		$	299,727	$	(8,322	)
State and political subdivisions		91,359		(6,094	)		104		(26	)		91,463		(6,120	)
Total HTM	$	391,086	$	(14,416	)	$	104	$	(26	)	$	391,190	$	(14,442	)
Available-for-Sale
U.S. Government agencies	$	159,090	$	(4,599	)	$	--	$	--		$	159,090	$	(4,599	)
State and political subdivisions		1,211		(11	)		--		--			1,211		(11	)
Total AFS	$	160,301	$	(4,610	)	$	--	$	--		$	160,301	$	(4,610	)

Investment Income [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2013		2012		2013		2012
Taxable:
Held-to-maturity	$	760	$	829	$	1,463	$	1,681
Available-for-sale		546		585		1,065		1,111
Non-taxable:
Held-to-maturity		1,709		1,899		3,384		3,796
Available-for-sale		4		--		9		--
Total	$	3,019	$	3,313	$	5,921	$	6,588

Investments Classified by Contractual Maturity Date [Table Text Block]

	Held-to-Maturity				Available-for-Sale
(In thousands)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
One year or less	$	29,768	$	29,879	$	350	$	350
After one through five years		188,430		186,541		55,674		55,216
After five through ten years		240,321		234,222		110,092		106,032
After ten years		96,945		92,512		1,043		1,132
Other securities		--		--		14,337		14,801
Total	$	555,464	$	543,154	$	181,496	$	177,531