Investment in Securities (Tables)

9 Months Ended

Sep. 30, 2016

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, 2016
			Gross		Gross
	Amortized		Unrealized		Unrealized
(In thousands)	Cost		Gains		Losses		Fair Value
State and political subdivisions	$	348,829	$	17,350	$	174	$	366,005
U.S. government agencies		8,159		12		1		8,170
Certificates of deposit		8,496		—		—		8,496
Total	$	365,484	$	17,362	$	175	$	382,671
	December 31, 2015
			Gross		Gross
	Amortized		Unrealized		Unrealized
(In thousands)	Cost		Gains		Losses		Fair Value
State and political subdivisions	$	356,531	$	12,552	$	13	$	369,070
Certificates of deposit		6,626		—		—		6,626
Total	$	363,157	$	12,552	$	13	$	375,696

Schedule of the Fair Value of Securities with Unrealized Losses

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

	September 30, 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	$	19,000	$	174	$	—	$	—	$	19,000	$	174
subdivisions
U.S. government agencies		3,095		1		—		—		3,095		1
Certificates of deposit		—		—		—		—		—		—
Total	$	22,095	$	175	$	—	$	—	$	22,095	$	175

	December 31, 2015
	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	$	3,638	$	5	$	1,208	$	8	$	4,846	$	13
subdivisions
Certificates of deposit		—		—		—		—		—		—
Total	$	3,638	$	5	$	1,208	$	8	$	4,846	$	13

Schedule of Amortized Cost and Fair Value of Investment

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, 2016
(In thousands)	Amortized Cost		Fair Value
Due in 1 year or less	$	36,857	$	37,215
Due after 1 year through 5 years		56,860		58,725
Due after 5 years through 10 years		146,015		155,834
Due after 10 years		125,752		130,897
Total	$	365,484	$	382,671