Securities (Tables)

9 Months Ended

Sep. 30, 2021

Investments Debt And Equity Securities [Abstract]

Summary of the Amortized Cost and Fair Value of Available-for-Sale Investment Securities Corresponding Amounts of Unrealized Gains and Losses

The following table summarizes the amortized cost and fair value of the available for sale investment securities portfolio at September 30, 2021 and December 31, 2020 and the corresponding amounts of unrealized gains and losses recognized in accumulated other comprehensive income:

			Gross		Gross
	Amortized		Unrealized		Unrealized
(In Thousands of Dollars)	Cost		Gains		Losses			Fair Value
September 30, 2021
U.S. Treasury and U.S. government sponsored entities	$	89,919	$	53	$	(1,502	)	$	88,470
State and political subdivisions		485,125		22,776		(618	)		507,283
Corporate bonds		3,604		77		(14	)		3,667
Mortgage-backed securities - residential		569,235		2,778		(5,909	)		566,104
Collateralized mortgage obligations - residential		12,956		290		(5	)		13,241
Small Business Administration		4,471		125		0			4,596
Totals	$	1,165,310	$	26,099	$	(8,048	)	$	1,183,361

			Gross		Gross
	Amortized		Unrealized		Unrealized
(In Thousands of Dollars)	Cost		Gains		Losses			Fair Value
December 31, 2020
U.S. Treasury and U.S. government sponsored entities	$	11,798	$	101	$	(54	)	$	11,845
State and political subdivisions		344,160		22,350		(204	)		366,306
Corporate bonds		3,582		132		(2	)		3,712
Mortgage-backed securities - residential		157,106		4,919		(243	)		161,782
Collateralized mortgage obligations - residential		25,654		742		(3	)		26,393
Small Business Administration		5,411		151		0			5,562
Totals	$	547,711	$	28,395	$	(506	)	$	575,600

Amortized Cost and Fair Value of the Debt Securities Maturity

The amortized cost and fair value of the debt securities portfolio are shown by expected maturity.  Expected maturities may differ from contractual maturities if issuers have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.

	September 30, 2021
(In Thousands of Dollars)	Amortized Cost		Fair Value
Maturity
Within one year	$	3,791	$	3,820
One to five years		10,360		10,967
Five to ten years		125,179		125,944
Beyond ten years		439,318		458,689
Mortgage-backed, collateralized mortgage obligations and Small Business Administration securities		586,662		583,941
Total	$	1,165,310	$	1,183,361

Available for Sale Investment Securities with Unrealized Losses

The following table summarizes the available for sale investment securities with unrealized losses at September 30, 2021 and December 31, 2020, aggregated by major security type and length of time in a continuous unrealized loss position.

	Less than 12 Months					12 Months or Longer					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
(In Thousands of Dollars)	Value		Loss			Value		Loss			Value		Loss
September 30, 2021
U.S. Treasury and U.S. government sponsored entities	$	84,849	$	(1,479	)	$	627	$	(23	)	$	85,476	$	(1,502	)
State and political subdivisions		64,442		(562	)		4,579		(56	)		69,021		(618	)
Corporate bonds		533		(11	)		197		(3	)		730		(14	)
Mortgage-backed securities - residential		390,783		(5,909	)		10		0			390,793		(5,909	)
Collateralized mortgage obligations - residential		1,419		(2	)		249		(3	)		1,668		(5	)
Total	$	542,026	$	(7,963	)	$	5,662	$	(85	)	$	547,688	$	(8,048	)

	Less than 12 Months					12 Months or Longer				Total
	Fair		Unrealized			Fair		Unrealized		Fair		Unrealized
(In Thousands of Dollars)	Value		Loss			Value		Loss		Value		Loss
December 31, 2020
U.S. Treasury and U.S. government sponsored entities	$	8,153	$	(54	)	$	0	$	0	$	8,153	$	(54	)
State and political subdivisions		19,205		(204	)		0		0		19,205		(204	)
Corporate bonds		198		(2	)		0		0		198		(2	)
Mortgage-backed securities - residential		63,401		(243	)		0		0		63,401		(243	)
Collateralized mortgage obligations - residential		294		(3	)		0		0		294		(3	)
Total	$	91,251	$	(506	)	$	0	$	0	$	91,251	$	(506	)