Investments (Tables)

12 Months Ended

Dec. 31, 2021

Investments [Abstract]

Investment

	December 31, 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	263,809		8,622		215		272,216		266,483		11,467		139		277,811
Mortgage-backed securities:
U.S. government agencies	1,085,092		16,146		6,927		1,094,311		815,682		34,807		105		850,384
Private label	8,555		553		—		9,108		9,976		916		—		10,892
Trust preferred securities	4,570		—		367		4,203		4,557		—		457		4,100
Corporate securities	27,292		1,047		12		28,327		31,465		2,146		1		33,610
Total Securities
Available-for-Sale	$	1,389,318	$	26,368	$	7,521	$	1,408,165	$	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):  

	December 31, 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	$	13,277	$	152	$	2,420	$	63	$	15,697	$	215
Mortgage-backed securities:
U.S. Government agencies	639,514		6,920		23,295		7		662,809		6,927
Trust preferred securities	—		—		4,203		367		4,203		367
Corporate securities	988		12		—		—		988		12
Total available-for-sale	$	653,779	$	7,084	$	29,918	$	437	$	683,697	$	7,521

	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 December 31, 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.

	Cost		Estimated Fair Value
Securities Available-for-Sale
Due in one year or less	$	3,024	$	3,089
Due after one year through five years	41,823		43,746
Due after five years through ten years	269,825		279,486
Due after ten years	1,074,646		1,081,844
	$	1,389,318	$	1,408,165

Gross Gains And Losses Realized

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

	For the year ended December 31,
	2021		2020		2019
Gross unrealized gains recognized on equity securities still held	$	547	$	223	$	888
Gross unrealized losses recognized on equity securities still held	(43)		(1,086)		—
Net unrealized gains (losses) recognized on equity securities still held	$	504	$	(863)	$	888
Gross realized gains	$	312	$	139	$	226
Gross realized losses	—		(77)		(157)
Net realized investment security gains	$	312	$	62	$	69