Note 3 - Investment Securities (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Unrealized Gain (Loss) on Investments [Table Text Block]

	At December 31, 2020
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available for sale
U.S. Government agencies	$	32,312	$	-	$	(426	)	$	31,886
Collateralized mortgage obligations		218,232		3,584		(270	)		221,546
Agency mortgage-backed securities		149,325		1,204		(1	)		150,528
Municipal securities		8,201		24		-			8,225
Corporate bonds		119,118		595		(3,390	)		116,323
Investment securities available for sale	$	527,188	$	5,407	$	(4,087	)	$	528,508
Held to maturity
U.S. Government agencies	$	82,093	$	4,185	$	-		$	86,278
Collateralized mortgage obligations		363,363		12,687		(231	)		375,819
Agency mortgage-backed securities		369,480		5,640		(245	)		374,875
Investment securities held to maturity	$	814,936	$	22,512	$	(476	)	$	836,972
Equity securities (1)								$	9,039

	At December 31, 2019
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available for sale
U.S. Government agencies	$	38,743	$	1	$	(439	)	$	38,305
Collateralized mortgage obligations		329,492		2,368		(422	)		331,438
Agency mortgage-backed securities		98,953		82		(98	)		98,937
Municipal securities		4,064		18		-			4,082
Corporate bonds		69,499		79		(3,298	)		66,280
Investment securities available for sale	$	540,751	$	2,548	$	(4,257	)	$	539,042
Held to maturity
U.S. Government agencies	$	94,913	$	482	$	(294	)	$	95,101
Collateralized mortgage obligations		416,177		7,603		(793	)		422,987
Agency mortgage-backed securities		133,752		1,782		(513	)		135,021
Investment securities held to maturity	$	644,842	$	9,867	$	(1,600	)	$	653,109
Equity securities								$	-

Investments Classified by Contractual Maturity Date [Table Text Block]

	Available for Sale				Held to Maturity
(dollars in thousands)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in 1 year or less	$	12,989	$	12,977	$	757	$	763
After 1 year to 5 years		77,313		76,426		73,504		77,214
After 5 years to 10 years		52,410		50,308		7,832		8,301
After 10 years		16,919		16,723		-		-
Collateralized mortgage obligations		218,232		221,546		363,363		375,819
Agency mortgage-backed securities		149,325		150,528		369,480		374,875
Total investment securities	$	527,188	$	528,508	$	814,936	$	836,972

Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]

(dollars in thousands)	2020		2019		2018
Beginning Balance, January 1st	$	-	$	-	$	274
Reductions for securities sold during the period		-		-		(274	)
Ending Balance, December 31st	$	-	$	-	$	-

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]

	At December 31, 2020
	Less than 12 months				12 months or more				Total
(dollars in thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
U.S. Government agencies	$	-	$	-	$	31,886	$	426	$	31,886	$	426
Collateralized mortgage obligations		99,497		270		-		-		99,497		270
Agency mortgage-backed securities		20,934		1		-		-		20,934		1
Municipal securities		-		-		-		-		-		-
Corporate bonds		4,559		39		54,649		3,351		59,208		3,390
Investment Securities Available for Sale	$	124,990	$	310	$	86,535	$	3,777	$	211,525	$	4,087

	At December 31, 2020
	Less than 12 months				12 months or more				Total
(dollars in thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
U.S. Government agencies	$	-	$	-	$	-	$	-	$	-	$	-
Collateralized mortgage obligations		62,603		231		-		-		62,603		231
Agency mortgage-backed securities		54,537		245		-		-		54,537		245
Investment Securities Held to Maturity	$	117,140	$	476	$	-	$	-	$	117,140	$	476

	At December 31, 2019
	Less than 12 months				12 months or more				Total
(dollars in thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
U.S. Government agencies	$	28,136	$	439	$	-	$	-	$	28,136	$	439
Collateralized mortgage obligations		63,384		328		6,164		94		69,548		422
Agency mortgage-backed securities		2,924		13		6,411		85		9,335		98
Municipal securities		-		-		-		-		-		-
Corporate bonds		2,820		180		51,882		3,118		54,702		3,298
Investment Securities Available for Sale	$	97,264	$	960	$	64,457	$	3,297	$	161,721	$	4,257

	At December 31, 2019
	Less than 12 months				12 months or more				Total
(dollars in thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
U.S. Government agencies	$	33,092	$	220	$	3,703	$	74	$	36,795	$	294
Collateralized mortgage obligations		24,211		18		64,324		775		88,535		793
Agency mortgage-backed securities		14,044		33		52,132		480		66,176		513
Investment Securities Held to Maturity	$	71,347	$	271	$	120,159	$	1,329	$	191,506	$	1,600