Investment in Securities

12 Months Ended

Dec. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Investment in Securities

Note 3
Investment in Securities

Investment securities available-for-sale are recorded at fair value on a recurring basis. The Company’s investment securities available-for-sale at December 31, 2017 and 2016 are measured at fair value using Level 2 valuations. The market evaluation utilizes several sources which include “observable inputs” rather than “significant unobservable inputs” and therefore falls into the Level 2 category. The table below presents the balances of securities available-for-sale measured at fair value on a recurring basis. The amortized cost, gross unrealized gains, gross unrealized losses and fair value of debt and equity securities are summarized as follows:

	December 31, 2017
			Gross		Gross
	Amortized		Unrealized		Unrealized
(In thousands)	Cost		Gains		Losses		Fair Value
State and political subdivisions	$	408,165	$	9,528	$	661	$	417,032
U.S. government agencies		46,222		—		722		45,500
Certificates of deposit		7,991		—		—		7,991
Total	$	462,378	$	9,528	$	1,383	$	470,523
	December 31, 2016
			Gross		Gross
	Amortized		Unrealized		Unrealized
(In thousands)	Cost		Gains		Losses		Fair Value
State and political subdivisions	$	368,223	$	5,239	$	3,328	$	370,134
U.S. government agencies		13,075		—		403		12,672
Certificates of deposit		7,746		—		—		7,746
Total	$	389,044	$	5,239	$	3,731	$	390,552

The fair values of securities with unrealized losses are as follows:

					December 31, 2017
	Less than 12 months				12 months or more				Total
	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
(In thousands)	Fair Value		Losses		Fair Value		Losses		Fair value		Losses
State and political subdivisions	$	34,755	$	123	$	31,251	$	538	$	66,006	$	661
U.S. government agencies		34,183		376		11,317		346		45,500		722
Certificates of deposit		—		—		—		—		—		—
Total	$	68,938	$	499	$	42,568	$	884	$	111,506	$	1,383
					December 31, 2016
	Less than 12 months				12 months or more				Total
	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
(In thousands)	Fair Value		Losses		Fair Value		Losses		Fair value		Losses
State and political subdivisions	$	140,384	$	3,328	$	—	$	—	$	140,384	$	3,328
U.S. government agencies		12,672		403		—		—		12,672		403
Certificates of deposit		—		—		—		—		—		—
Total	$	153,056	$	3,731	$	—	$	—	$	153,056	$	3,731

There were 64 securities, or 17% of the total (24 greater than 12 months), in an unrealized loss position as of December 31, 2017 compared to 108 securities (none greater than 12 months) in an unrealized loss position as of December 31, 2016. All unrealized losses are reviewed to determine whether the losses are other than temporary. Management believes that all unrealized losses are temporary since they are market driven, the Company does not have the intent to sell the security, and it is more likely than not that the Company will not be required to sell prior to recovery of the amortized basis.

The amortized cost and fair value of debt and equity securities by contractual maturity are shown in the following table. Expected maturities may differ from contractual maturities because borrowers have the right to prepay obligations with or without prepayment penalties.

	December 31, 2017
(In thousands)	Amortized Cost		Fair Value
Due in 1 year or less	$	22,492	$	22,638
Due after 1 year through 5 years		57,922		58,425
Due after 5 years through 10 years		256,396		263,961
Due after 10 years		125,568		125,499
No stated maturity		—		—
Total	$	462,378	$	470,523

The premium related to the purchase of state and political subdivisions was $7,147,000 and $5,749,000 in 2017 and 2016, respectively.

The amortized cost of debt securities pledged to secure public deposits, securities sold under agreements to repurchase and for other purposes at December 31, 2017 and 2016 was $3,750,000.

Proceeds from sales of debt securities classified as available-for-sale were $0 in 2017, $21,491,000 in 2016, and $99,347,000 in 2015. Gross realized gains on the sales in 2017, 2016 and 2015 were $0, $387,000, and $2,910,000, respectively. There were no gross realized losses on sales in 2017, 2016 or 2015.