Quarterly report pursuant to Section 13 or 15(d)

Securities (Details)

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Securities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost $ 563,988 $ 563,518  
Gross Unrealized Gains 21,192 23,039  
Gross Unrealized (Losses) (1,963) (1,175)  
Total securities available for sale, Estimated Fair Value 583,217 585,382 621,751
U.S. government and agency securities [Member]
     
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost 2,279 2,581  
Gross Unrealized Gains 539 268  
Total securities available for sale, Estimated Fair Value 2,818 2,849  
Obligations of states and political subdivisions [Member]
     
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost 231,861 214,980  
Gross Unrealized Gains 13,303 15,123  
Gross Unrealized (Losses) (1,367) (325)  
Total securities available for sale, Estimated Fair Value 243,797 229,778  
Corporate and other bonds [Member]
     
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost 6,728 7,353  
Gross Unrealized Gains 174 173  
Gross Unrealized (Losses) (122) (314)  
Total securities available for sale, Estimated Fair Value 6,780 7,212  
Mortgage-backed securities [Member]
     
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost 319,827 335,327  
Gross Unrealized Gains 7,107 7,383  
Gross Unrealized (Losses) (474) (536)  
Total securities available for sale, Estimated Fair Value 326,460 342,174  
Other securities [Member]
     
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost 3,293 3,277  
Gross Unrealized Gains 69 92  
Total securities available for sale, Estimated Fair Value $ 3,362 $ 3,369