Note 3 - Investment Securities (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

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

	At December 3 1 , 2018
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Collateralized mortgage obligations	$	197,812	$	567	$	(2,120	)	$	196,259
Agency mortgage-backed securities		39,105		5		(611	)		38,499
Municipal securities		20,807		64		(232	)		20,639
Corporate bonds		62,583		87		(3,396	)		59,274
Asset-backed securities		6,433		-		(90	)		6,343
Total securities available for sale	$	326,740	$	723	$	(6,449	)	$	321,014
U.S. Government agencies	$	107,390	$	-	$	(3,772	)	$	103,618
Collateralized mortgage obligations		500,690		570		(5,793	)		495,467
Agency mortgage-backed securities		153,483		-		(5,245	)		148,238
Total securities held to maturity	$	761,563	$	570	$	(14,810	)	$	747,323

	At December 31, 2017
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Collateralized mortgage obligations	$	327,972	$	-	$	(7,731	)	$	320,241
Agency mortgage-backed securities		55,664		2		(800	)		54,866
Municipal securities		15,142		20		(62	)		15,100
Corporate bonds		62,670		103		(2,491	)		60,282
Asset-backed securities		13,414		38		-			13,452
Trust preferred securities		725		-		(236	)		489
Total securities available for sale	$	475,587	$	163	$	(11,320	)	$	464,430
U.S. Government agencies	$	112,605	$	50	$	(2,235	)	$	110,420
Collateralized mortgage obligations		215,567		314		(3,970	)		211,911
Agency mortgage-backed securities		143,041		47		(2,620	)		140,468
Other securities		1,000		-		-			1,000
Total securities held to maturity	$	472,213	$	411	$	(8,825	)	$	463,799

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	$	2,375	$	2,375	$	-	$	-
After 1 year to 5 years		6,894		6,908		14,116		13,937
After 5 years to 10 years		75,320		71,734		93,274		89,681
After 10 years		5,234		5,239		-		-
Collateralized mortgage obligations		197,812		196,259		500,690		495,467
Agency mortgage-backed securities		39,105		38,499		153,483		148,238
Total	$	326,740	$	321,014	$	761,563	$	747,323

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

(dollars in thousands)	201 8			201 7			201 6
Beginning Balance, January 1 st	$	274		$	937		$	930
Additional credit-related impairment loss on securities for which an other-than-temporary impairment was previously recognized		-			-			7
Reductions for securities sold during the period		(274	)		(663	)		-
Ending Balance, December 31 st	$	-		$	274		$	937

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

	At December 31, 201 8
	Less than 12 months				12 months or more				Total
(dollars in thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Collateralized mortgage obligations	$	58,883	$	270	$	83,377	$	1,850	$	142,260	$	2,120
Agency mortgage-backed securities		1,134		10		16,768		601		17,902		611
Municipal securities		1,549		7		12,154		225		13,703		232
Corporate bonds		-		-		53,189		3,396		53,189		3,396
Asset backed securities		6,343		90		-		-		6,343		90
Total Available for Sale	$	67,909	$	377	$	165,488	$	6,072	$	233,397	$	6,449

	At December 31, 201 8
	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	$	5,351	$	26	$	98,267	$	3,746	$	103,618	$	3,772
Collateralized mortgage obligations		44,574		475		173,467		5,318		218,041		5,793
Agency mortgage-backed securities		-		-		119,243		5,245		119,243		5,245
Total Held to Maturity	$	49,925	$	501	$	390,977	$	14,309	$	440,902	$	14,810

	At December 31, 201 7
	Less than 12 months				12 months or more				Total
(dollars in thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Collateralized mortgage obligations	$	150,075	$	1,565	$	170,166	$	6,166	$	320,241	$	7,731
Agency mortgage-backed securities		29,967		226		21,045		574		51,012		800
Municipal securities		5,742		27		2,656		35		8,398		62
Corporate bonds		-		-		52,509		2,491		52,509		2,491
Asset backed securities		-		-		-		-		-		-
Trust preferred securities		-		-		489		236		489		236
Total Available for Sale	$	185,784	$	1,818	$	246,865	$	9,502	$	432,649	$	11,320

	At December 31, 2017
	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	$	42,045	$	213	$	59,594	$	2,022	$	101,639	$	2,235
Collateralized mortgage obligations		56,955		767		107,986		3,203		164,941		3,970
Agency mortgage-backed securities		55,170		221		82,479		2,399		137,649		2,620
Total Held to Maturity	$	154,170	$	1,201	$	250,059	$	7,624	$	404,229	$	8,825