Investment Securities (Tables)

12 Months Ended

Dec. 31, 2018

Investment Securities [Abstract]

Amortization Cost And Estimated Fair Value Of Investment Securities

	2018
(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross  Unrealized Losses		Fair Value
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

	2017
Held-to-Maturity Securities:
State and municipals	$	6,970	$	78	$	—	$	7,048
Pass-through mortgage securities		311		21		—		332
Collateralized mortgage obligations		355		14		—		369
	$	7,636	$	113	$	—	$	7,749
Available-for-Sale Securities:
State and municipals	$	453,158	$	10,051	$	(1,886)	$	461,323
Pass-through mortgage securities		72,539		84		(1,232)		71,391
Collateralized mortgage obligations		190,175		15		(2,776)		187,414
	$	715,872	$	10,150	$	(5,894)	$	720,128

Securities With A Continuous Unrealized Losses Position

	2018
	Less than 12 Months				12 Months or More				Total
(in thousands)	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
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)

	2017
State and municipals	$	54,732	$	(574)	$	28,723	$	(1,312)	$	83,455	$	(1,886)
Pass-through mortgage securities		10,172		(81)		52,652		(1,151)		62,824		(1,232)
Collateralized mortgage obligations		130,267		(1,230)		54,751		(1,546)		185,018		(2,776)
Total temporarily impaired	$	195,171	$	(1,885)	$	136,126	$	(4,009)	$	331,297	$	(5,894)

Sales Of Available-For-Sale Securities

(in thousands)	2018		2017		2016
Proceeds	$	263,994	$	135,695	$	62,047
Gains	$	300	$	382	$	1,869
Losses		(10,706)		(2,249)		(18)
Net gain (loss)	$	(10,406)	$	(1,867)	$	1,851

Maturities

(in thousands)	Amortized Cost		Fair Value
Held-to-Maturity Securities:
Within one year	$	3,059	$	3,059
After 1 through 5 years		2,083		2,119
After 5 through 10 years		—		—
After 10 years		—		—
Mortgage-backed securities		362		374
	$	5,504	$	5,552
Available-for-Sale Securities:
Within one year	$	47,839	$	48,271
After 1 through 5 years		37,588		37,683
After 5 through 10 years		284,907		283,676
After 10 years		170,901		167,998
Mortgage-backed securities		221,009		220,387
	$	762,244	$	758,015