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Note 3 - Investment Securities (Tables)

9 Months Ended

Sep. 30, 2017

Notes Tables

Investment [Table Text Block]

		September 30, 2017																December 31, 2016
(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		$	66,928			$	40			$	(140	)		$	66,828			$	76,875			$	107			$	(182	)		$	76,800
Mortgage-backed securities			16,972				56				(191	)			16,837				19,773				63				(249	)			19,587
State and political subdivisions			320,116				6,397				(55	)			326,458				362,532				4,967				(842	)			366,657
Other securities			2,017				--				--				2,017				2,916				--				--				2,916
Total HTM		$	406,033			$	6,493			$	(386	)		$	412,140			$	462,096			$	5,137			$	(1,273	)		$	465,960

Available-for-Sale
U.S. Treasury		$	--			$	--			$	--			$	--			$	300			$	--			$	--			$	300
U.S. Government agencies			210,004				273				(2,057	)			208,220				140,005				67				(2,301	)			137,771
Mortgage-backed securities			973,111				120				(13,533	)			959,698				885,783				178				(17,637	)			868,324
State and political subdivisions			87,405				161				(2,744	)			84,822				108,374				38				(5,469	)			102,943
Other securities			63,295				1,385				--				64,680				47,022				996				(2	)			48,016
Total AFS		$	1,333,815			$	1,939			$	(18,334	)		$	1,317,420			$	1,181,484			$	1,279			$	(25,409	)		$	1,157,354

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		$	12,947			$	(53	)		$	39,913			$	(87	)		$	52,860			$	(140	)
Mortgage-backed securities			4,094				(42	)			6,687				(149	)			10,781				(191	)
State and political subdivisions			11,300				(41	)			2,634				(14	)			13,934				(55	)
Total HTM		$	28,341			$	(136	)		$	49,234			$	(250	)		$	77,575			$	(386	)

Available-for-Sale
U.S. Government agencies		$	66,254			$	(750	)		$	82,211			$	(1,307	)		$	148,465			$	(2,057	)
Mortgage-backed securities			626,560				(7,458	)			273,883				(6,075	)			900,443				(13,533	)
State and political subdivisions			1,813				(32	)			76,781				(2,712	)			78,594				(2,744	)
Other securities			--				--				100				--				100				--
Total AFS		$	694,627			$	(8,240	)		$	432,975			$	(10,094	)		$	1,127,602			$	(18,334	)

Investment Income [Table Text Block]

		Three Months Ended September 30,								Nine Months Ended September 30,
(In thousands)		2017				2016				2017				2016
Taxable:
Held-to-maturity		$	625			$	771			$	1,922			$	3,094
Available-for-sale			5,949				4,005				18,003				12,931
Non-taxable:
Held-to-maturity			2,135				2,617				6,635				8,162
Available-for-sale			509				381				2,099				592
Total		$	9,218			$	7,774			$	28,659			$	24,779

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		$	50,829			$	50,838			$	21,211			$	21,145
After one through five years			105,323				105,823				81,147				80,388
After five through ten years			99,399				100,902				14,532				14,427
After ten years			133,510				137,740				181,619				178,182
Securities not due on a single maturity date			16,972				16,837				973,111				959,698
Other securities (no maturity)			--				--				62,195				63,580
Total		$	406,033			$	412,140			$	1,333,815			$	1,317,420