Investment in Securities (Tables)

9 Months Ended

Sep. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of Investment Securities

The amortized cost, gross unrealized gains, gross unrealized losses and fair value of investment securities are summarized as follows:

	September 30, 2021
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
State and political subdivisions	$	345,165	$	13,880	$	821	$	358,224
U.S. government agencies	112,850		537		1,288		112,099
Corporate Bonds	70,516		281		41		70,756
Total	$	528,531	$	14,698	$	2,150	$	541,079

	December 31, 2020
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
State and political subdivisions	$	287,059	$	18,915	$	—	$	305,974
U.S. government agencies	50,988		764		—		51,752
Total	$	338,047	$	19,679	$	—	$	357,726

Schedule of Unrealized Loss on Investments

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

	September 30, 2021
	Less than 12 months				12 months or more				Total
(In thousands)	Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses
State and political subdivisions	$	68,399	$	821	$	—	$	—	$	68,399	$	821
U.S. government agencies	88,386		1,288		—		—		88,386		1,288
Corporate Bonds	10,940		41		—		—		10,940		41
Total	$	167,725	$	2,150	$	—	$	—	$	167,725	$	2,150

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The amortized cost and fair value of investment 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.

	September 30, 2021
(In thousands)	Amortized Cost		Fair Value
Due in 1 year or less	$	25,511	$	25,760
Due after 1 year through 5 years	104,620		109,737
Due after 5 years through 10 years	210,353		219,204
Due after 10 years	188,047		186,378
Total	$	528,531	$	541,079