Securities (Tables)

9 Months Ended

Sep. 30, 2018

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, 2018 and December 31, 2017 and the corresponding amounts of unrealized gains and losses recognized in accumulated other comprehensive income:

			Gross		Gross
(In Thousands of Dollars)	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses			Fair Value
September 30, 2018
U.S. Treasury and U.S. government sponsored entities	$	6,561	$	0	$	(178	)	$	6,383
State and political subdivisions		205,352		707		(4,784	)		201,275
Corporate bonds		1,207		0		(24	)		1,183
Mortgage-backed securities - residential		154,726		19		(7,318	)		147,427
Collateralized mortgage obligations - residential		22,498		0		(1,197	)		21,301
Small Business Administration		13,145		0		(718	)		12,427
Totals	$	403,489	$	726	$	(14,219	)	$	389,996

			Gross		Gross
(In Thousands of Dollars)	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses			Fair Value
December 31, 2017
U.S. Treasury and U.S. government sponsored entities	$	8,986	$	0	$	(69	)	$	8,917
State and political subdivisions		188,032		3,614		(643	)		191,003
Corporate bonds		1,238		4		(8	)		1,234
Mortgage-backed securities - residential		161,635		419		(1,604	)		160,450
Collateralized mortgage obligations - residential		17,898		0		(777	)		17,121
Small Business Administration		14,608		0		(396	)		14,212
Totals	$	392,397	$	4,037	$	(3,497	)	$	392,937

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, 2018
(In Thousands of Dollars)	Amortized Cost		Fair Value
Maturity
Within one year	$	10,619	$	10,621
One to five years		41,968		41,478
Five to ten years		140,200		137,491
Beyond ten years		20,333		19,251
Mortgage-backed, collateralized mortgage obligations and Small Business Administration securities		190,369		181,155
Total	$	403,489	$	389,996

Available for Sale Investment Securities with Unrealized Losses

The following table summarizes the available-for-sale investment securities with unrealized losses at September 30, 2018 and December 31, 2017, aggregated by major security type and length of time in a continuous unrealized loss position.

	Less than 12 Months					12 Months or Longer					Total
(In Thousands of Dollars)	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
	Value		Loss			Value		Loss			Value		Loss
September 30, 2018
Available-for-sale
U.S. Treasury and U.S. government sponsored entities	$	1,574	$	(18	)	$	4,809	$	(160	)	$	6,383	$	(178	)
State and political subdivisions		99,196		(2,979	)		30,670		(1,805	)		129,866		(4,784	)
Corporate bonds		614		(8	)		568		(16	)		1,182		(24	)
Mortgage-backed securities - residential		74,571		(2,625	)		72,043		(4,693	)		146,614		(7,318	)
Collateralized mortgage obligations - residential		4,915		(103	)		14,385		(1,094	)		19,300		(1,197	)
Small Business Administration		4		0			12,412		(718	)		12,416		(718	)
Total	$	180,874	$	(5,733	)	$	134,887	$	(8,486	)	$	315,761	$	(14,219	)

	Less than 12 Months					12 Months or Longer					Total
(In Thousands of Dollars)	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
	Value		Loss			Value		Loss			Value		Loss
December 31, 2017
Available-for-sale
U.S. Treasury and U.S. government sponsored entities	$	3,970	$	(34	)	$	1,912	$	(35	)	$	5,882	$	(69	)
State and political subdivisions		33,188		(220	)		25,721		(423	)		58,909		(643	)
Corporate bonds		397		(3	)		383		(5	)		780		(8	)
Mortgage-backed securities - residential		40,072		(400	)		53,760		(1,204	)		93,832		(1,604	)
Collateralized mortgage obligations - residential		1,701		(22	)		15,420		(755	)		17,121		(777	)
Small Business Administration		0		0			14,182		(396	)		14,182		(396	)
Total	$	79,328	$	(679	)	$	111,378	$	(2,818	)	$	190,706	$	(3,497	)