Investments (Tables)

12 Months Ended

Dec. 31, 2020

Investments [Abstract]

Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities

	December 31, 2020								December 31, 2019
	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:
U.S. Treasuries and U.S.
government agencies	$	—	$	—	$	—	$	—	$	500	$	2	$	—	$	502
Obligations of states and
political subdivisions	266,483		11,467		139		277,811		112,393		4,800		6		117,187
Mortgage-backed securities:
U.S. government agencies	815,682		34,807		105		850,384		631,637		12,292		1,825		642,104
Private label	9,976		916		—		10,892		10,896		589		—		11,485
Trust preferred securities	4,557		—		457		4,100		4,781		27		347		4,461
Corporate securities	31,465		2,146		1		33,610		31,669		500		43		32,126
Total Debt Securities	1,128,163		49,336		702		1,176,797		791,876		18,210		2,221		807,865
Certificates of deposit held for investment	1,992		—		—		1,992		2,241		—		—		2,241
Total Securities
Available-for-Sale	$	1,130,155	$	49,336	$	702	$	1,178,789	$	794,117	$	18,210	$	2,221	$	810,106

Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities

Securities held-to-maturity:
Mortgage-backed securities:
U.S. government agencies	$	—	$	—	$	—	$	—	$	49,036	$	1,562	—		$	50,598
Total Securities
Held-to-Maturity	$	—	$	—	$	—	$	—	$	49,036	$	1,562	$	—	$	50,598

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, 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

	December 31, 2019
	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	$	230	$	—	$	1,439	$	6	$	1,669	$	6
Mortgage-backed securities:
U.S. Government agencies	123,289		1,247		34,746		578		158,035		1,825
Trust preferred securities	4,200		347		—		—		4,200		347
Corporate securities	11,248		43		—		—		11,248		43
Total available-for-sale	$	138,967	$	1,637	$	36,185	$	584	$	175,152	$	2,221

    

There were no held-to-maturity securities in an unrealized loss position as of December 31, 2019.

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, 2020, 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	$	5,211	$	5,307
Due after one year through five years	32,776		34,499
Due after five years through ten years	276,898		293,388
Due after ten years	813,278		843,603
	$	1,128,163	$	1,176,797

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,
	2020		2019		2018
Gross unrealized gains recognized on equity securities still held	$	223	$	888	$	208
Gross unrealized losses recognized on equity securities still held	(1,086)		—		(298)
Net unrealized (losses) gains recognized on equity securities still held	$	(863)	$	888	$	(90)
Gross realized gains	$	139	$	226	$	—
Gross realized losses	(77)		(157)		—
Net realized investment security gains	$	62	$	69	$	—