Investment Securities (Tables)

6 Months Ended

Jun. 30, 2018

Investment Securities [Abstract]

Amortization Cost And Estimated Fair Value Of Investment Securities

	June 30, 2018
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
(in thousands)	Cost		Gains		Losses		Value
Held-to-Maturity Securities:
State and municipals	$	5,060	$	55	$	—	$	5,115
Pass-through mortgage securities		295		17		—		312
Collateralized mortgage obligations		220		6		—		226
	$	5,575	$	78	$	—	$	5,653
Available-for-Sale Securities:
State and municipals	$	461,047	$	4,833	$	(5,444)	$	460,436
Pass-through mortgage securities		74,603		24		(2,767)		71,860
Collateralized mortgage obligations		276,781		—		(7,218)		269,563
	$	812,431	$	4,857	$	(15,429)	$	801,859
	December 31, 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

	June 30, 2018
	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	$	153,335	$	(2,896)	$	26,941	$	(2,548)	$	180,276	$	(5,444)
Pass-through mortgage securities		19,588		(513)		47,729		(2,254)		67,317		(2,767)
Collateralized mortgage obligations		211,754		(4,325)		57,754		(2,893)		269,508		(7,218)
Total temporarily impaired	$	384,677	$	(7,734)	$	132,424	$	(7,695)	$	517,101	$	(15,429)
	December 31, 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

	Six Months Ended				Three Months Ended
(in thousands)	June 30,				June 30,
	2018		2017		2018		2017
Proceeds	$	—	$	40,011	$	—	$	—
Gross gains	$	—	$	366	$	—	$	—
Gross losses		—		(309)		—		—
Net gain	$	—	$	57	$	—	$	—

Maturities

(in thousands)	Amortized Cost		Fair Value
Held-to-Maturity Securities:
Within one year	$	2,988	$	2,995
After 1 through 5 years		2,072		2,120
After 5 through 10 years		—		—
After 10 years		—		—
Mortgage-backed securities		515		538
	$	5,575	$	5,653
Available-for-Sale Securities:
Within one year	$	42,866	$	43,606
After 1 through 5 years		74,020		74,586
After 5 through 10 years		172,977		173,052
After 10 years		171,184		169,192
Mortgage-backed securities		351,384		341,423
	$	812,431	$	801,859