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Note 3 - Investment Securities (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Investment [Table Text Block]

		Years Ended December 31
		2016																2015
(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		$	76,875			$	107			$	(182	)		$	76,800			$	237,139			$	582			$	(1,395	)		$	236,326
Mortgage-backed securities			19,773				63				(249	)			19,587				24,774				86				(290	)			24,570
State and political subdivisions			362,532				4,967				(842	)			366,657				440,676				9,138				(123	)			449,691
Other securities			2,916				--				--				2,916				2,784				--				--				2,784
Total		$	462,096			$	5,137			$	(1,273	)		$	465,960			$	705,373			$	9,806			$	(1,808	)		$	713,371
Available-for-Sale
U.S. Treasury		$	300			$	--			$	--			$	300			$	4,000			$	--			$	(6	)		$	3,994
U.S. Government agencies			140,005				67				(2,301	)			137,771				121,017				118				(898	)			120,237
Mortgage-backed securities			885,783				178				(17,637	)			868,324				650,619				937				(4,130	)			647,426
State and political subdivisions			108,374				38				(5,469	)			102,943				9,762				112				--				9,874
Other securities			47,022				996				(2	)			48,016				39,594				420				(138	)			39,876
Total		$	1,181,484			$	1,279			$	(25,409	)		$	1,157,354			$	824,992			$	1,587			$	(5,172	)		$	821,407

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
December 31, 2016
Held-to-Maturity
U.S. Government agencies		$	32,859			$	141			$	19,959			$	41			$	52,818			$	182
Mortgage-backed securities			11,833				205				1,465				44				13,298				249
State and political subdivisions			104,974				841				330				1				105,304				842
Total		$	149,666			$	1,187			$	21,754			$	86			$	171,420			$	1,273
Available-for-Sale
U.S. Government agencies		$	126,325			$	2,301			$	--			$	--			$	126,325			$	2,301
Mortgage-backed securities			833,393				17,637				--				--				833,393				17,637
State and political subdivisions			94,922				5,469				--				--				94,922				5,469
Other securities			99				2				--				--				99				2
Total		$	1,054,739			$	25,409			$	--			$	--			$	1,054,739			$	25,409
December 31, 2015
Held-to-Maturity
U.S. Government agencies		$	107,758			$	567			$	79,166			$	828			$	186,924			$	1,395
Mortgage-backed securities			7,958				94				8,144				196				16,102				290
State and political subdivisions			27,866				100				3,946				23				31,812				123
Total		$	143,582			$	761			$	91,256			$	1,047			$	234,838			$	1,808
Available-for-Sale
U.S. Treasury		$	3,994			$	6			$	--			$	--			$	3,994			$	6
U.S. Government agencies			62,473				317				46,023				581				108,496				898
Mortgage-backed securities			523,185				4,130				--				--				523,185				4,130
State and political subdivisions			281				--				--				--				281				--
Other securities			1,060				137				510				1				1,570				138
Total		$	590,993			$	4,590			$	46,533			$	582			$	637,526			$	5,172

Investment Income [Table Text Block]

(In thousands)		2016				2015				2014
Taxable
Held-to-maturity		$	3,778			$	5,162			$	5,839
Available-for-sale			17,928				12,129				2,785
Non-taxable
Held-to-maturity			10,641				11,635				10,625
Available-for-sale			1,132				1,687				108
Total		$	33,479			$	30,613			$	19,357

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		$	52,055			$	52,034			$	1,552			$	1,552
After one through five years			122,870				123,029				96,774				95,688
After five through ten years			105,482				106,097				12,756				12,539
After ten years			161,916				165,213				138,697				132,335
Securities not due on a single maturity date			19,773				19,587				885,783				868,324
Other securities (no maturity)			--				--				45,922				46,916
Total		$	462,096			$	465,960			$	1,181,484			$	1,157,354

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