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Investment in Securities (Tables)
 6 Months Ended
Jun. 30, 2017
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:

      June 30, 2017
Gross Gross
Amortized       Unrealized       Unrealized      
(In thousands) Cost Gains Losses Fair Value
State and political subdivisions $ 403,935 $ 11,256 $ 1,076 $ 414,115
U.S. government agencies 12,446 — 328 12,118
Certificates of deposit 5,746 — — 5,746
Total $ 422,127 $ 11,256 $ 1,404 $ 431,979
 
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
Schedule of the Fair Value of Securities with Unrealized Losses

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

      June 30, 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 $ 45,082 $ 1,076 $ — $ — $ 45,082 $ 1,076
U.S. government agencies 12,118 328 — — 12,118 328
Certificates of deposit — — — — — —
Total $ 57,200 $ 1,404 $ — $ — $ 57,200 $ 1,404
 
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
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.

      June 30, 2017
(In thousands) Amortized Cost       Fair Value
Due in 1 year or less $ 21,393 $ 21,574
Due after 1 year through 5 years 58,167 59,364
Due after 5 years through 10 years 207,799 215,950
Due after 10 years 134,768 135,091
Total $ 422,127 $ 431,979