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Investment in Securities (Tables)
 3 Months Ended
Mar. 31, 2013
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:

March 31, 2013
Gross Gross
Amortized       Unrealized Unrealized
(In thousands)       Cost Gains       Losses       Fair Value
State and political subdivisions $     283,625 $     17,343 $     203 $     300,765
Certificates of deposit 6,742 — — 6,742
       Total $ 290,367 $ 17,343 $ 203 $ 307,507
 
December 31, 2012
Gross Gross
Amortized Unrealized Unrealized
(In thousands) Cost Gains Losses Fair Value
State and political subdivisions $ 315,345 $ 19,960 $ 112 $ 335,193
Certificates of deposit 6,742 — — 6,742
       Total $ 322,087 $ 19,960 $ 112 $ 341,935
Schedule of Unrealized Loss on Investments [Table Text Block]

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

March 31, 2013
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       $     28,408 $     203 $     — $     — $     28,048 $     203
Certificates of deposit — — — — — —
       Total $ 28,048 $ 203 $ — $ — $ 28,048 $ 203
 
December 31, 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 $ 19,758 $ 112 $ —       $ — $ 19,758 $ 112
Certificates of deposit — — — — — —
       Total $ 19,758 $ 112 $ — $ — $ 19,758 $ 112
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. Expected maturities may differ from contractual maturities because borrowers have the right to prepay obligations with or without prepayment penalties.

March 31, 2013
(In thousands) Amortized Cost Fair Value
Due in 1 year or less $     16,816       $     17,039
Due after 1 year through 5 years 72,535 77,867
Due after 5 years through 10 years       148,171 155,920
Due after 10 years 52,845 56,681
       Total $ 290,367 $ 307,507