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Securities (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Security
Jun. 30, 2012
Security
Dec. 31, 2012
Available-for-Sale [Abstract]          
Amortized Cost $ 691,793,000   $ 691,793,000   $ 583,858,000
Gross Unrealized Gains 9,008,000   9,008,000   19,970,000
Gross Unrealized Losses (13,439,000)   (13,439,000)   (485,000)
Fair Value 687,362,000   687,362,000   603,343,000
Held-to-Maturity [Abstract]          
Amortized Cost 1,662,000   1,662,000   1,662,000
Gross Unrealized Gains 1,000   1,000   1,000
Gross Unrealized Losses (42,000)   (42,000)   (4,000)
Fair Value 1,621,000   1,621,000   1,659,000
Available-for-Sale, Amortized Cost [Abstract]          
Due in one year or less 5,785,000   5,785,000    
Due after one through five years 22,121,000   22,121,000    
Due after five through ten years 121,095,000   121,095,000    
Due after ten years 37,793,000   37,793,000    
U.S. government sponsored agency mortgage-backed securities 449,999,000   449,999,000    
Total debt securities 636,793,000   636,793,000    
Marketable equity securities 55,000,000   55,000,000    
Total securities 691,793,000   691,793,000    
Available-for-Sale, Fair Value [Abstract]          
Due in one year or less 5,823,000   5,823,000    
Due after one through five years 22,811,000   22,811,000    
Due after five through ten years 117,651,000   117,651,000    
Due after ten years 37,265,000   37,265,000    
U.S. government sponsored agency mortgage-backed securities 450,336,000   450,336,000    
Total debt securities 633,886,000   633,886,000    
Marketable equity securities 53,476,000   53,476,000    
Total securities 687,362,000   687,362,000    
Held-to-Maturity, Amortized Cost [Abstract]          
Due in one year or less 0   0    
Due after one through five years 0   0    
Due after five through ten years 1,182,000   1,182,000    
Due after ten years 480,000   480,000    
U.S. government sponsored agency mortgage-backed securities 0   0    
Total debt securities 1,662,000   1,662,000    
Marketable equity securities 0   0    
Total securities 1,662,000   1,662,000    
Held-to-Maturity, Fair Value [Abstract]          
Due in one year or less 0   0    
Due after one through five years 0   0    
Due after five through ten years 1,183,000   1,183,000    
Due after ten years 438,000   438,000    
U.S. government sponsored agency mortgage-backed securities 0   0    
Total debt securities 1,621,000   1,621,000    
Marketable equity securities 0   0    
Total securities 1,621,000   1,621,000    
Securities gains (loss), net (8,000) 819,000 (8,000) 819,000  
Number of security sold     2 2  
Realized pre-tax gain on sale of securities       885,000  
Realized pre-tax loss on sale of securities       66,000  
Securities pledged as collateral to secure public deposit and for other purposes 250,800,000   250,800,000   262,400,000
Amortized cost of securities sold under agreements to repurchase 241,500,000   241,500,000   237,300,000
Percentage of total investment with unrealized losses (in hundredths) 61.40%   61.40%   14.80%
Available-for-Sale, Amortized Cost [Abstract]          
Less Than 12 Months 435,115,000   435,115,000   89,265,000
Total 436,215,000   436,215,000   89,265,000
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (13,416,000)   (13,416,000)   (485,000)
Total (13,439,000)   (13,439,000)   (485,000)
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 421,699,000   421,699,000   88,780,000
Total 422,773,000   422,773,000   88,780,000
Held-to-Maturity, Amortized Cost [Abstract]          
Less Than 12 Months 480,000   480,000   480,000
Held-to-Maturity, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (42,000)   (42,000)   (4,000)
Held-to-Maturity, Fair Value [Abstract]          
Less Than 12 Months 438,000   438,000   476,000
U.S. Treasury and government agencies [Member]
          
Available-for-Sale [Abstract]          
Amortized Cost 71,075,000   71,075,000   60,625,000
Gross Unrealized Gains 288,000   288,000   463,000
Gross Unrealized Losses (3,755,000)   (3,755,000)   (173,000)
Fair Value 67,608,000   67,608,000   60,915,000
Held-to-Maturity [Abstract]          
Amortized Cost 480,000   480,000   480,000
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses (42,000)   (42,000)   (4,000)
Fair Value 438,000   438,000   476,000
Available-for-Sale, Amortized Cost [Abstract]          
Less Than 12 Months 60,516,000   60,516,000   47,576,000
Total 60,516,000   60,516,000   47,576,000
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (3,755,000)   (3,755,000)   (173,000)
Total (3,755,000)   (3,755,000)   (173,000)
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 56,761,000   56,761,000   47,403,000
Total 56,761,000   56,761,000   47,403,000
Held-to-Maturity, Amortized Cost [Abstract]          
Less Than 12 Months 480,000   480,000   480,000
Held-to-Maturity, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (42,000)   (42,000)   (4,000)
Held-to-Maturity, Fair Value [Abstract]          
Less Than 12 Months 438,000   438,000   476,000
State and political subdivisions [Member]
          
Available-for-Sale [Abstract]          
Amortized Cost 115,719,000   115,719,000   107,987,000
Gross Unrealized Gains 2,429,000   2,429,000   5,369,000
Gross Unrealized Losses (2,206,000)   (2,206,000)   (135,000)
Fair Value 115,942,000   115,942,000   113,221,000
Held-to-Maturity [Abstract]          
Amortized Cost 1,182,000   1,182,000   1,182,000
Gross Unrealized Gains 1,000   1,000   1,000
Gross Unrealized Losses 0   0   0
Fair Value 1,183,000   1,183,000   1,183,000
Available-for-Sale, Amortized Cost [Abstract]          
Less Than 12 Months 57,652,000   57,652,000   11,126,000
12 Months or More 1,097,000   1,097,000    
Total 58,749,000   58,749,000   11,126,000
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (2,183,000)   (2,183,000)   (135,000)
12 Months or More (23,000)   (23,000)    
Total (2,206,000)   (2,206,000)   (135,000)
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 55,469,000   55,469,000   10,991,000
12 Months or More 1,074,000   1,074,000    
Total 56,543,000   56,543,000   10,991,000
U.S. government sponsored agency mortgage-backed securities [Member]
          
Available-for-Sale [Abstract]          
Amortized Cost 449,999,000   449,999,000   370,246,000
Gross Unrealized Gains 6,291,000   6,291,000   13,347,000
Gross Unrealized Losses (5,954,000)   (5,954,000)   (12,000)
Fair Value 450,336,000   450,336,000   383,581,000
Available-for-Sale, Amortized Cost [Abstract]          
Less Than 12 Months 261,947,000   261,947,000   10,563,000
Total 261,947,000   261,947,000   10,563,000
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (5,954,000)   (5,954,000)   (12,000)
Total (5,954,000)   (5,954,000)   (12,000)
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 255,993,000   255,993,000   10,551,000
Total 255,993,000   255,993,000   10,551,000
Debt securities [Member]
          
Available-for-Sale [Abstract]          
Amortized Cost 636,793,000   636,793,000   538,858,000
Gross Unrealized Gains 9,008,000   9,008,000   19,179,000
Gross Unrealized Losses (11,915,000)   (11,915,000)   (320,000)
Fair Value 633,886,000   633,886,000   557,717,000
Available-for-Sale, Amortized Cost [Abstract]          
Less Than 12 Months 380,115,000   380,115,000   69,265,000
12 Months or More 1,097,000   1,097,000    
Total 381,212,000   381,212,000   69,265,000
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (11,892,000)   (11,892,000)   (320,000)
12 Months or More (23,000)   (23,000)    
Total (11,915,000)   (11,915,000)   (320,000)
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 368,223,000   368,223,000   68,945,000
12 Months or More 1,074,000   1,074,000    
Total 369,297,000   369,297,000   68,945,000
Marketable equity securities [Member]
          
Available-for-Sale [Abstract]          
Amortized Cost 55,000,000   55,000,000   45,000,000
Gross Unrealized Gains 0   0   791,000
Gross Unrealized Losses (1,524,000)   (1,524,000)   (165,000)
Fair Value 53,476,000   53,476,000   45,626,000
Available-for-Sale, Amortized Cost [Abstract]          
Less Than 12 Months 55,000,000   55,000,000   20,000,000
Total 55,000,000   55,000,000   20,000,000
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (1,524,000)   (1,524,000)   (165,000)
Total (1,524,000)   (1,524,000)   (165,000)
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 53,476,000   53,476,000   19,835,000
Total $ 53,476,000   $ 53,476,000   $ 19,835,000