Investment Securities (Tables)

9 Months Ended

Sep. 30, 2019

Investment Securities [Abstract]

Amortization Cost And Estimated Fair Value Of Investment Securities

	September 30, 2019
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
(in thousands)	Cost		Gains		Losses		Value
Held-to-Maturity Securities:
State and municipals	$	3,737	$	24	$	—	$	3,761
Pass-through mortgage securities		246		16		—		262
	$	3,983	$	40	$	—	$	4,023
Available-for-Sale Securities:
State and municipals	$	380,556	$	10,796	$	(187)	$	391,165
Pass-through mortgage securities		61,222		1,212		(22)		62,412
Collateralized mortgage obligations		142,974		3,130		(106)		145,998
Corporate bonds		119,000		—		(2,575)		116,425
U.S. Treasury bills		12,493		2		—		12,495
	$	716,245	$	15,140	$	(2,890)	$	728,495
	December 31, 2018
Held-to-Maturity Securities:
State and municipals	$	5,142	$	36	$	—	$	5,178
Pass-through mortgage securities		267		11		—		278
Collateralized mortgage obligations		95		1		—		96
	$	5,504	$	48	$	—	$	5,552
Available-for-Sale Securities:
State and municipals	$	422,235	$	3,220	$	(5,417)	$	420,038
Pass-through mortgage securities		66,631		24		(1,169)		65,486
Collateralized mortgage obligations		154,378		886		(363)		154,901
Corporate bonds		119,000		—		(1,410)		117,590
	$	762,244	$	4,130	$	(8,359)	$	758,015

Securities With A Continuous Unrealized Losses Position

	September 30, 2019
	Less than				12 Months
	12 Months				or More				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(in thousands)	Value		Loss		Value		Loss		Value		Loss
State and municipals	$	7,665	$	(41)	$	5,095	$	(146)	$	12,760	$	(187)
Pass-through mortgage securities		—		—		4,128		(22)		4,128		(22)
Collateralized mortgage obligations		6,489		(106)		—		—		6,489		(106)
Corporate bonds		116,425		(2,575)		—		—		116,425		(2,575)
Total temporarily impaired	$	130,579	$	(2,722)	$	9,223	$	(168)	$	139,802	$	(2,890)
	December 31, 2018
State and municipals	$	102,882	$	(1,639)	$	62,995	$	(3,778)	$	165,877	$	(5,417)
Pass-through mortgage securities		38,421		(142)		23,425		(1,027)		61,846		(1,169)
Collateralized mortgage obligations		32,577		(89)		7,342		(274)		39,919		(363)
Corporate bonds		97,590		(1,410)		—		—		97,590		(1,410)
Total temporarily impaired	$	271,470	$	(3,280)	$	93,762	$	(5,079)	$	365,232	$	(8,359)

Sales Of Available-For-Sale Securities

	Nine Months Ended				Three Months Ended
(in thousands)	September 30,				September 30,
	2019		2018		2019		2018
Proceeds	$	—	$	169,631	$	—	$	169,631
Gross gains	$	—	$	300	$	—	$	300
Gross losses		—		(5,260)		—		(5,260)
Net loss	$	—	$	(4,960)	$	—	$	(4,960)

Maturities

(in thousands)	Amortized Cost		Fair Value
Held-to-Maturity Securities:
Within one year	$	2,734	$	2,752
After 1 through 5 years		1,003		1,009
After 5 through 10 years		—		—
After 10 years		—		—
Mortgage-backed securities		246		262
	$	3,983	$	4,023
Available-for-Sale Securities:
Within one year	$	24,939	$	24,991
After 1 through 5 years		58,668		59,617
After 5 through 10 years		276,196		277,886
After 10 years		152,246		157,591
Mortgage-backed securities		204,196		208,410
	$	716,245	$	728,495