Note 4 - Securities Available for Sale (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

(in thousands)	Amortized		Unrealized
December 31, 2019	cost		Gains		Losses			Fair value
U.S. Treasury and other U.S. government obligations	$	49,887	$	10	$	-		$	49,897
Government sponsored enterprise obligations		208,933		1,189		(178	)		209,944
Mortgage backed securities - government agencies		193,574		1,243		(956	)		193,861
Obligations of states and political subdivisions		16,919		117		—			17,036
Total securities available for sale	$	469,313	$	2,559	$	(1,134	)	$	470,738
December 31, 2018
Government sponsored enterprise obligations	$	264,234	$	156	$	(3,351	)	$	261,039
Mortgage backed securities - government agencies		149,748		282		(3,753	)		146,277
Obligations of states and political subdivisions		29,760		107		(188	)		29,679
Total securities available for sale	$	443,742	$	545	$	(7,292	)	$	436,995

Investments Classified by Contractual Maturity Date [Table Text Block]

(in thousands)	Amortized cost		Fair value
Due within 1 year	$	129,251	$	129,311
Due after 1 year but within 5 years		32,124		32,208
Due after 5 years but within 10 years		6,162		6,219
Due after 10 years		108,202		109,139
Mortgage backed securities - government agencies		193,574		193,861
Total securities available for sale	$	469,313	$	470,738

Schedule of Unrealized Loss on Investments [Table Text Block]

	Less than 12 months					12 months or more					Total
(in thousands)	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
December 31, 2019	value		losses			value		losses			value		losses
Government sponsored enterprise obligations	$	16,503	$	(107	)	$	11,492	$	(71	)	$	27,995	$	(178	)
Mortgage-backed securities - government agencies		81,664		(496	)		32,453		(460	)		114,117		(956	)
Total temporarily impaired securities	$	98,167	$	(603	)	$	43,945	$	(531	)	$	142,112	$	(1,134	)
December 31, 2018
Government sponsored enterprise obligations	$	96,740	$	(38	)	$	149,320	$	(3,313	)	$	246,060	$	(3,351	)
Mortgage-backed securities - government agencies		3,108		(5	)		120,848		(3,748	)		123,956		(3,753	)
Obligations of states and political subdivisions		814		(1	)		17,639		(187	)		18,453		(188	)
Total temporarily impaired securities	$	100,662	$	(44	)	$	287,807	$	(7,248	)	$	388,469	$	(7,292	)