Securities (Tables)

6 Months Ended

Jun. 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 June 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
June 30, 2018
U.S. Treasury and U.S. government sponsored entities	$	6,810	$	0	$	(153	)	$	6,657
State and political subdivisions		201,170		1,824		(2,860	)		200,134
Corporate bonds		1,207		0		(26	)		1,181
Mortgage-backed securities - residential		158,515		35		(5,980	)		152,570
Collateralized mortgage obligations - residential		16,313		0		(932	)		15,381
Small Business Administration		13,466		0		(499	)		12,967
Totals	$	397,481	$	1,859	$	(10,450	)	$	388,890

			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.

	June 30, 2018
(In Thousands of Dollars)	Amortized Cost		Fair Value
Maturity
Within one year	$	10,884	$	10,901
One to five years		46,736		46,521
Five to ten years		128,523		128,164
Beyond ten years		23,044		22,386
Mortgage-backed, collateralized mortgage obligations and Small Business Administration securities		188,294		180,918
Total	$	397,481	$	388,890

Investment Securities with Unrealized Losses

The following table summarizes the investment securities with unrealized losses at June 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
June 30, 2018
Available-for-sale
U.S. Treasury and U.S. government sponsored entities	$	3,670	$	(83	)	$	2,543	$	(70	)	$	6,213	$	(153	)
State and political subdivisions		71,567		(1,800	)		25,585		(1,060	)		97,152		(2,860	)
Corporate bonds		805		(15	)		376		(11	)		1,181		(26	)
Mortgage-backed securities - residential		91,490		(2,645	)		59,103		(3,335	)		150,593		(5,980	)
Collateralized mortgage obligations - residential		1,516		(40	)		13,865		(892	)		15,381		(932	)
Small Business Administration		5		0			12,944		(499	)		12,949		(499	)
Total	$	169,053	$	(4,583	)	$	114,416	$	(5,867	)	$	283,469	$	(10,450	)

	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	)