Note 3 - Investment Securities (Tables)

6 Months Ended

Jun. 30, 2017

Notes Tables

Investment [Table Text Block]

	June 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	$	67,912	$	52	$	(178	)	$	67,786	$	76,875	$	107	$	(182	)	$	76,800
Mortgage-backed securities		17,882		66		(198	)		17,750		19,773		63		(249	)		19,587
State and political subdivisions		331,249		6,623		(105	)		337,767		362,532		4,967		(842	)		366,657
Other securities		1,960		--		--			1,960		2,916		--		--			2,916
Total HTM	$	419,003	$	6,741	$	(481	)	$	425,263	$	462,096	$	5,137	$	(1,273	)	$	465,960
Available-for-Sale
U.S. Treasury	$	19,996	$	1	$	--		$	19,997	$	300	$	--	$	--		$	300
U.S. Government agencies		149,296		213		(1,890	)		147,619		140,005		67		(2,301	)		137,771
Mortgage-backed securities		892,080		95		(13,970	)		878,205		885,783		178		(17,637	)		868,324
State and political subdivisions		86,915		133		(3,376	)		83,672		108,374		38		(5,469	)		102,943
Other securities		59,990		1,117		--			61,107		47,022		996		(2	)		48,016
Total AFS	$	1,208,277	$	1,559	$	(19,236	)	$	1,190,600	$	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	$	14,938	$	(62	)	$	37,883	$	(116	)	$	52,821	$	(178	)
Mortgage-backed securities		10,036		(151	)		1,291		(47	)		11,327		(198	)
State and political subdivisions		18,939		(104	)		225		(1	)		19,164		(105	)
Total HTM	$	43,913	$	(317	)	$	39,399	$	(164	)	$	83,312	$	(481	)
Available-for-Sale
U.S. Government agencies	$	111,504	$	(1,761	)	$	16,868	$	(129	)	$	128,372	$	(1,890	)
Mortgage-backed securities		785,746		(12,903	)		45,673		(1,067	)		831,419		(13,970	)
State and political subdivisions		57,309		(2,137	)		20,158		(1,239	)		77,467		(3,376	)
Other securities		100		--			--		--			100		--
Total AFS	$	954,659	$	(16,801	)	$	82,699	$	(2,435	)	$	1,037,358	$	(19,236	)

Investment Income [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2017		2016		2017		2016
Taxable:
Held-to-maturity	$	636	$	1,446	$	1,297	$	2,323
Available-for-sale		6,238		4,492		12,054		8,926
Non-taxable:
Held-to-maturity		2,217		2,399		4,500		5,545
Available-for-sale		899		162		1,590		211
Total	$	9,990	$	8,499	$	19,441	$	17,005

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	$	50,648	$	50,636	$	21,212	$	21,213
After one through five years		108,555		109,055		100,683		99,792
After five through ten years		100,222		101,798		8,941		8,712
After ten years		141,696		146,024		126,471		122,671
Securities not due on a single maturity date		17,882		17,750		892,080		878,205
Other securities (no maturity)		--		--		58,890		60,007
Total	$	419,003	$	425,263	$	1,208,277	$	1,190,600