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Note 3 - Investment Securities (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Investment [Table Text Block]

		Years Ended December 31
		2017																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		$	46,945			$	7			$	(228	)		$	46,724			$	76,875			$	107			$	(182	)		$	76,800
Mortgage-backed securities			16,132				8				(287	)			15,853				19,773				63				(249	)			19,587
State and political subdivisions			301,491				5,962				(222	)			307,231				362,532				4,967				(842	)			366,657
Other securities			3,490				--				--				3,490				2,916				--				--				2,916
Total HTM		$	368,058			$	5,977			$	(737	)		$	373,298			$	462,096			$	5,137			$	(1,273	)		$	465,960
Available-for-Sale
U.S. Treasury		$	--			$	--			$	--			$	--			$	300			$	--			$	--			$	300
U.S. Government agencies			141,559				116				(1,951	)			139,724				140,005				67				(2,301	)			137,771
Mortgage-backed securities			1,208,017				246				(20,946	)			1,187,317				885,783				178				(17,637	)			868,324
State and political subdivisions			144,642				532				(2,009	)			143,165				108,374				38				(5,469	)			102,943
Other securities			118,106				1,206				(1	)			119,311				47,022				996				(2	)			48,016
Total AFS		$	1,612,324			$	2,100			$	(24,907	)		$	1,589,517			$	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
December 31, 2017
Held-to-Maturity
U.S. Government agencies		$	11,961			$	6			$	32,778			$	222			$	44,739			$	228
Mortgage-backed securities			5,471				47				8,946				240				14,417				287
State and political subdivisions			40,299				198				1,887				24				42,186				222
Total HTM		$	57,731			$	251			$	43,611			$	486			$	101,342			$	737
Available-for-Sale
U.S. Government agencies		$	91,988			$	921			$	25,742			$	1,030			$	117,730			$	1,951
Mortgage-backed securities			510,770				4,516				609,329				16,430				1,120,099				20,946
State and political subdivisions			25,049				202				75,404				1,807				100,453				2,009
Other securities			--				--				99				1				99				1
Total AFS		$	627,807			$	5,639			$	710,574			$	19,268			$	1,338,381			$	24,907
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 HTM		$	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 AFS		$	1,054,739			$	25,409			$	--			$	--			$	1,054,739			$	25,409

Investment Income [Table Text Block]

(In thousands)		2017				2016				2015
Taxable
Held-to-maturity		$	2,521			$	3,778			$	5,162
Available-for-sale			25,996				17,928				12,129
Non-taxable
Held-to-maturity			8,693				10,641				11,635
Available-for-sale			2,905				1,132				1,687
Total		$	40,115			$	33,479			$	30,613

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		$	46,377			$	46,255			$	590			$	591
After one through five years			85,451				85,581				35,616				35,246
After five through ten years			92,361				93,400				24,203				23,953
After ten years			127,737				132,209				225,892				223,198
Securities not due on a single maturity date			16,132				15,853				1,208,017				1,187,317
Other securities (no maturity)			--				--				118,006				119,212
Total		$	368,058			$	373,298			$	1,612,324			$	1,589,517

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