Note 3 - Investment Securities (Tables)

9 Months Ended

Sep. 30, 2013

Investments, Debt and Equity Securities [Abstract]

Investment [Table Text Block]

	September 30,2013									December 31,2012
(In thousands)	Amortized Cost		Gross Unrealized Gains		GrossUnrealized (Losses)			Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		GrossUnrealized (Losses)			Estimated Fair Value
Held-to-Maturity
U.S. Government agencies	$	313,052	$	23	$	(8,580	)	$	304,495	$	288,098	$	135	$	(679	)	$	287,554
Mortgage-backed securities		41		1		-			42		49		1		-			50
State and political subdivisions		268,055		2,548		(5,057	)		265,546		207,374		5,140		(160	)		212,354
Other securities		620		-		-			620		620		-		-			620
Total HTM	$	581,768	$	2,572	$	(13,637	)	$	570,703	$	496,141	$	5,276	$	(839	)	$	500,578
Available-for-Sale
U.S. Government agencies	$	168,055	$	4	$	(4,932	)	$	163,127	$	152,708	$	65	$	(292	)	$	152,481
Mortgage-backed securities		1,811		183		-			1,994		20,436		287		(89	)		20,634
State and political subdivisions		1,268		-		(5	)		1,263		2,989		-		(1	)		2,988
Other securities		13,082		471		-			13,553		14,787		456		(4	)		15,239
Total AFS	$	184,216	$	658	$	(4,937)		$	179,937	$	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	$	289,718	$	(8,334	)	$	8,754	$	(246	)	$	298,472	$	(8,580	)
State and political subdivisions		88,357		(5,024	)		1,590		(334	)		89,947		(5,057	)
Total HTM	$	378,075	$	(13,358	)	$	10,344	$	(279	)	$	388,419	$	(13,637	)
Available-for-Sale
U.S. Government agencies	$	154,760	$	(4,904	)	$	973	$	(28	)	$	155,733	$	(4,932	)
State and political subdivisions		1,213		(5	)		-		-			1,213		(5	)
Total AFS	$	155,973	$	(4,909	)	$	973	$	(28	)	$	156,946	$	(4,937	)

Investment Income [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
(In thousands)	2013		2012		2013		2012
Taxable:
Held-to-maturity	$	818	$	707	$	2,281	$	2,389
Available-for-sale		540		514		1,605		1,624
Non-taxable:
Held-to-maturity		2,066		1,806		5,450		5,602
Available-for-sale		4		-		13		-
Total	$	3,428	$	3,027	$	9,349	$	9,615

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	$	29,360	$	29,432	$	350	$	350
After one through five years		194,855		193,353		60,734		60,389
After five through ten years		227,380		220,876		109,091		104,589
After ten years		129,553		126,422		959		1,056
Other securities		620		620		13,082		13,553
Total	$	581,768	$	570,703	$	184,216	$	179,937