Note 3 - Investment Securities (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

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

	At December 31, 201 7
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Collateralized mortgage obligations	$	327,972	$	-	$	(7,731	)	$	320,241
Agency m ortgage-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 m ortgage-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

	At December 31, 2016
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Collateralized mortgage obligations	$	230,252	$	145	$	(5,632	)	$	224,765
Agency m ortgage-backed securities		37,973		32		(1,295	)		36,710
Municipal securities		26,825		151		(429	)		26,547
Corporate bonds		66,718		8		(1,978	)		64,748
Asset-backed securities		15,565		-		(416	)		15,149
Trust preferred securities		3,063		-		(1,243	)		1,820
Total securities available for sale	$	380,396	$	336	$	(10,993	)	$	369,739
U.S. Government agencies	$	98,538	$	8	$	(2,238	)	$	96,308
Collateralized mortgage obligations		202,990		793		(2,553	)		201,230
Agency mortgage-backed securities		129,951		1		(3,327	)		126,625
Other securities		1,020		-		-			1,020
Total securities held to maturity	$	432,499	$	802	$	(8,118	)	$	425,183

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	$	1,153	$	1,156	$	-	$	-
After 1 year to 5 years		6,613		6,624		11,149		11,116
After 5 years to 10 years		79,701		76,993		102,456		100,304
After 10 years		4,484		4,550		-		-
Collateralized mortgage obligations		327,972		320,241		215,567		211,911
Agency mortgage-backed securities		55,664		54,866		143,041		140,468
Total	$	475,587	$	464,430	$	472,213	$	463,799

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

(dollars in thousands)	201 7			201 6		201 5
Beginning Balance, January 1 st	$	937		$	930	$	3,966
Additional credit-related impairment loss on securities for which an other-than-temporary impairment was previously recognized		-			7		3
Reductions for securities sold during the period		(663	)		-		(3,039	)
Ending Balance, December 31 st	$	274		$	937	$	930

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

	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 m ortgage-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

	At December 31, 2016
	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	$	192,308	$	5,380	$	7,579	$	252	$	199,887	$	5,632
Agency mortgage-backed securities		29,916		1,260		3,199		35		33,115		1,295
Municipal securities		15,414		429		-		-		15,414		429
Corporate bonds		32,257		1,708		10,726		270		42,983		1,978
Asset backed securities		-		-		15,149		416		15,149		416
Trust preferred securities		-		-		1,820		1,243		1,820		1,243
Total Available for Sale	$	269,895	$	8,777	$	38,473	$	2,216	$	308,368	$	10,993

	At December 31, 2016
	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	$	67,725	$	2,198	$	3,586	$	40	$	71,311	$	2,238
Collateralized mortgage obligations		108,974		2,469		8,572		84		117,546		2,553
Agency mortgage-backed securities		97,725		3,327		-		-		97,725		3,327
Total Held to Maturity	$	274,424	$	7,994	$	12,158	$	124	$	286,582	$	8,118

Schedule of Trust Preferred Securities [Table Text Block]

(dollars in thousands)	Class / Tranche	Amortized Cost		Fair Value		Unrealized Losses			Lowest Credit Rating Assigned	Number of Banks Currently Performing		Deferrals / Defaults as % of Current Balance			Conditional Default Rates for 2018 and beyond			Cumulative OTTI Life to Date
TPREF Funding II	Class B Notes	$	725	$	489	$	(236	)	C		18		29	%		0.42	%	$	274