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Investment in Securities (Tables)
6 Months Ended
Jun. 30, 2018
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, 2018
Gross Gross
Amortized Unrealized Unrealized
(In thousands)       Cost       Gains       Losses       Fair Value
State and political subdivisions $      343,850 $      3,276 $      3,441 $      343,685
U.S. government agencies 91,778 8 1,848 89,938
Certificates of deposit 7,240 7,240
Total $ 442,868 $ 3,284 $ 5,289 $ 440,863

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
Schedule of the Fair Value of Securities with Unrealized Losses

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

June 30, 2018
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 $     156,545 $      2,140 $      30,194 $      1,301 $      186,739 $      3,441
U.S. government agencies 71,861 1,245 10,322 603 82,183 1,848
Total $ 228,406 $ 3,385 $ 40,516 $ 1,904 $ 268,922 $ 5,289

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
Total $ 68,938 $ 499 $ 42,568 $ 884 $ 111,506 $ 1,383
Schedule of Amortized Cost and Fair Value of Investment

Expected maturities may differ from contractual maturities because borrowers have the right to prepay obligations with or without prepayment penalties.

June 30, 2018
(In thousands)       Amortized Cost       Fair Value
Due in 1 year or less $ 16,570 $       16,678
Due after 1 year through 5 years 102,182 102,497
Due after 5 years through 10 years 216,399 217,126
Due after 10 years 107,717 104,562
Total $ 442,868 $ 440,863