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Investment in Securities (Tables)
3 Months Ended
Mar. 31, 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:

March 31, 2017
Gross Gross
      Amortized       Unrealized       Unrealized      
(In thousands) Cost Gains Losses Fair Value
State and political subdivisions $ 403,011 $ 6,961 $ 2,539 $ 407,433
U.S. government agencies 12,787 401 12,386
Certificates of deposit 6,496 6,496
       Total $ 422,294 $ 6,961 $ 2,940 $ 426,315
    
    
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:

March 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 $ 110,100 $ 2,539 $   $ $ 110,100 $ 2,539
U.S. government agencies 12,386 401   12,386 401
Certificates of deposit
       Total $ 122,486 $ 2,940 $ $ $ 122,486 $ 2,940

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.

      March 31, 2017
(In thousands) Amortized Cost       Fair Value
Due in 1 year or less $ 25,264 $ 25,503
Due after 1 year through 5 years 54,901 56,013
Due after 5 years through 10 years   199,366 204,160
Due after 10 years   142,763 140,639
       Total $ 422,294 $ 426,315