Investments (Tables)

9 Months Ended

Sep. 30, 2021

Investments [Abstract]

Debt Securities, Available-for-sale

	September 30, 2021								December 31, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Securities available-for-sale:
Obligations of states and
political subdivisions	$	267,923	$	7,750	$	589	$	275,084	$	266,483	$	11,467	$	139	$	277,811
Mortgage-backed securities:
U.S. government agencies	1,038,806		20,906		5,289		1,054,423		815,682		34,807		105		850,384
Private label	8,864		701		—		9,565		9,976		916		—		10,892
Trust preferred securities	4,567		—		118		4,449		4,557		—		457		4,100
Corporate securities	27,337		1,221		2		28,556		31,465		2,146		1		33,610
Total Securities Available-for-Sale	$	1,347,497	$	30,578	$	5,998	$	1,372,077	$	1,128,163	$	49,336	$	702	$	1,176,797

Gross Unrealized Losses And Fair Value Of Investments

The following table shows the gross unrealized losses and fair value of the Company’s investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):

	September 30, 2021
	Less Than Twelve Months				Twelve Months or Greater				Total
	Estimated Fair Value		Unrealized Loss		Estimated Fair Value		Unrealized Loss		Estimated Fair Value		Unrealized Loss
Securities available-for-sale:
Obligations of states and political subdivisions	$	58,991	$	516	$	2,410	$	73	$	61,401	$	589
Mortgage-backed securities:
U.S. Government agencies	515,972		5,281		23,296		8		539,268		5,289
Trust preferred securities	—		—		4,449		118		4,449		118
Corporate securities	998		2		—		—		998		2
Total available-for-sale	$	575,961	$	5,799	$	30,155	$	199	$	606,116	$	5,998

	December 31, 2020
	Less Than Twelve Months				Twelve Months or Greater				Total
	Estimated Fair Value		Unrealized Loss		Estimated Fair Value		Unrealized Loss		Estimated Fair Value		Unrealized Loss
Securities available-for-sale:
Obligations of states and political subdivisions	$	10,578	$	139	$	—	$	—	$	10,578	$	139
Mortgage-backed securities:
U.S. Government agencies	62,412		105		35		—		62,447		105
Trust preferred securities	—		—		4,100		457		4,100		457
Corporate securities	488		1		—		—		488		1
Total available-for-sale	$	73,478	$	245	$	4,135	$	457	$	77,613	$	702

Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity

The amortized cost and estimated fair value of debt securities at September 30, 2021, by contractual maturity, is shown in the following table (in thousands).  Expected maturities will differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.  Mortgage-backed securities have been allocated to their respective maturity groupings based on their contractual maturity.

	Amortized Cost		Estimated Fair Value
Available-for-Sale Debt Securities
Due in one year or less	$	3,829	$	3,888
Due after one year through five years	42,608		44,755
Due after five years through ten years	248,098		259,506
Due after ten years	1,052,962		1,063,928
Total	$	1,347,497	$	1,372,077

Gross Gains And Losses Realized

Gross gains and gross losses recognized by the Company from investment security transactions are summarized in the table below (in thousands):

	Three months ended September 30,				Nine months ended September 30,
	2021		2020		2021		2020
Gross realized gains on securities sold	$	—	$	—	$	312	$	133
Gross realized losses on securities sold	—		—		—		(77)
Net investment security gains (losses)	$	—	$	—	$	312	$	56
Gross unrealized gains recognized on equity securities still held	$	100	$	461	$	481	$	170
Gross unrealized losses recognized on equity securities still held	(7)		—		(29)		(1,868)
Net unrealized gains (losses) recognized on equity securities still held	$	93	$	461	$	452	$	(1,698)