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Investment in Securities (Tables)
 9 Months Ended
Sep. 30, 2012
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block]
The amortized cost, gross unrealized gains, gross unrealized losses and fair value of investment securities are summarized as follows:
September 30, 2012
Gross Gross
      Amortized       Unrealized       Unrealized      
(In thousands) Cost Gains Losses Fair Value
State and political subdivisions $ 333,855 $ 20,834 $ 52 $ 354,637
Certificates of deposit 12,882 — — 12,882
       Total $ 346,737 $ 20,834 $ 52 $ 367,519
 
December 31, 2011
Gross Gross
Amortized Unrealized Unrealized
(In thousands) Cost Gains Losses Fair Value
State and political subdivisions $      287,585 $      19,797 $      20 $      307,362
Certificates of deposit     3,250   —     —   3,250
       Total $ 290,835 $ 19,797 $ 20 $ 310,612
Schedule of Unrealized Loss on Investments [Table Text Block]

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

September 30, 2012
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 $ 21,181 $ 52 $ — $ — $ 21,181 $ 52
Certificates of deposit — — — — — —
       Total $ 21,181 $ 52 $ — $ — $ 21,181 $ 52
 
December 31, 2011
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   $ 4,362 $ 20 $ —   $ — $ 4,362 $ 20
Certificates of deposit   —   — —   —     —     —
       Total $ 4,362 $ 20   $ — $ — $ 4,362 $ 20
Schedule Of Amortized Cost And Fair Value Table Text Block

The amortized cost and fair value of investment securities by contractual maturity are shown in the following table.

September 30, 2012
(In thousands)       Amortized Cost       Fair Value
Due in 1 year or less $  18,898 $      19,036
Due after 1 year through 5 years 62,453 66,994
Due after 5 years through 10 years   180,082   190,378
Due after 10 years   85,304   91,111
       Total $ 346,737 $ 367,519