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Securities (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Available-for-Sale [Abstract]          
Amortized Cost $ 669,304,000   $ 669,304,000   $ 583,858,000
Gross Unrealized Gains 8,221,000   8,221,000   19,970,000
Gross Unrealized Losses (13,609,000)   (13,609,000)   (485,000)
Fair Value 663,916,000   663,916,000   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 (49,000)   (49,000)   (4,000)
Fair Value 1,614,000   1,614,000   1,659,000
Available-for-Sale, Amortized Cost [Abstract]          
Due in one year or less 4,305,000   4,305,000    
Due after one through five years 23,044,000   23,044,000    
Due after five through ten years 120,948,000   120,948,000    
Due after ten years 36,460,000   36,460,000    
U.S. government sponsored agency mortgage-backed securities 429,547,000   429,547,000    
Total debt securities 614,304,000   614,304,000    
Marketable equity securities 55,000,000   55,000,000    
Total securities 669,304,000   669,304,000    
Available-for-Sale, Fair Value [Abstract]          
Due in one year or less 4,326,000   4,326,000    
Due after one through five years 23,774,000   23,774,000    
Due after five through ten years 117,093,000   117,093,000    
Due after ten years 35,688,000   35,688,000    
U.S. government sponsored agency mortgage-backed securities 429,517,000   429,517,000    
Total debt securities 610,398,000   610,398,000    
Marketable equity securities 53,518,000   53,518,000    
Total securities 663,916,000   663,916,000    
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 431,000   431,000    
U.S. government sponsored agency mortgage-backed securities 0   0    
Total debt securities 1,614,000   1,614,000    
Marketable equity securities 0   0    
Total securities 1,614,000   1,614,000    
Securities gains (loss), net (23,000) 0 (31,000) 819,000  
Realized pre-tax gain on sale of securities     284,000 885,000  
Realized pre-tax loss on sale of securities     315,000 66,000  
Securities pledged as collateral to secure public deposit and for other purposes 258,500,000   258,500,000   262,400,000
Amortized cost of securities sold under agreements to repurchase 246,700,000   246,700,000   237,300,000
Percentage of total investment with unrealized losses (in hundredths) 61.10%   61.10%   14.80%
Available-for-Sale, Amortized Cost [Abstract]          
Less Than 12 Months 411,207,000   411,207,000    
Total 419,896,000   419,896,000   89,265,000
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (13,565,000)   (13,565,000)    
Total (13,609,000)   (13,609,000)   (485,000)
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 397,642,000   397,642,000    
Total 406,287,000   406,287,000   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 (49,000)   (49,000)   (4,000)
Held-to-Maturity, Fair Value [Abstract]          
Less Than 12 Months 431,000   431,000   476,000
U.S. Treasury and government agencies [Member]
          
Available-for-Sale [Abstract]          
Amortized Cost 66,049,000   66,049,000   60,625,000
Gross Unrealized Gains 284,000   284,000   463,000
Gross Unrealized Losses (3,817,000)   (3,817,000)   (173,000)
Fair Value 62,516,000   62,516,000   60,915,000
Held-to-Maturity [Abstract]          
Amortized Cost 480,000   480,000   480,000
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses (49,000)   (49,000)   (4,000)
Fair Value 431,000   431,000   476,000
Available-for-Sale, Amortized Cost [Abstract]          
Less Than 12 Months 55,516,000   55,516,000   47,576,000
Total 55,516,000   55,516,000    
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (3,817,000)   (3,817,000)   (173,000)
Total (3,817,000)   (3,817,000)    
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 51,699,000   51,699,000   47,403,000
Total 51,699,000   51,699,000    
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 (49,000)   (49,000)   (4,000)
Held-to-Maturity, Fair Value [Abstract]          
Less Than 12 Months 431,000   431,000   476,000
State and political subdivisions [Member]
          
Available-for-Sale [Abstract]          
Amortized Cost 118,708,000   118,708,000   107,987,000
Gross Unrealized Gains 2,261,000   2,261,000   5,369,000
Gross Unrealized Losses (2,604,000)   (2,604,000)   (135,000)
Fair Value 118,365,000   118,365,000   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 60,407,000   60,407,000   11,126,000
12 Months or More 1,407,000   1,407,000    
Total 61,814,000   61,814,000    
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (2,568,000)   (2,568,000)   (135,000)
12 Months or More (36,000)   (36,000)    
Total (2,604,000)   (2,604,000)    
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 57,839,000   57,839,000   10,991,000
12 Months or More 1,371,000   1,371,000    
Total 59,210,000   59,210,000    
U.S. government sponsored agency mortgage-backed securities [Member]
          
Available-for-Sale [Abstract]          
Amortized Cost 429,547,000   429,547,000   370,246,000
Gross Unrealized Gains 5,676,000   5,676,000   13,347,000
Gross Unrealized Losses (5,706,000)   (5,706,000)   (12,000)
Fair Value 429,517,000   429,517,000   383,581,000
Available-for-Sale, Amortized Cost [Abstract]          
Less Than 12 Months 240,284,000   240,284,000   10,563,000
12 Months or More 7,282,000   7,282,000    
Total 247,566,000   247,566,000    
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (5,698,000)   (5,698,000)   (12,000)
12 Months or More (8,000)   (8,000)    
Total (5,706,000)   (5,706,000)    
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 234,586,000   234,586,000   10,551,000
12 Months or More 7,274,000   7,274,000    
Total 241,860,000   241,860,000    
Debt securities [Member]
          
Available-for-Sale [Abstract]          
Amortized Cost 614,304,000   614,304,000   538,858,000
Gross Unrealized Gains 8,221,000   8,221,000   19,179,000
Gross Unrealized Losses (12,127,000)   (12,127,000)   (320,000)
Fair Value 610,398,000   610,398,000   557,717,000
Available-for-Sale, Amortized Cost [Abstract]          
Less Than 12 Months 356,207,000   356,207,000   69,265,000
12 Months or More 8,689,000   8,689,000    
Total 364,896,000   364,896,000    
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (12,083,000)   (12,083,000)   (320,000)
12 Months or More (44,000)   (44,000)    
Total (12,127,000)   (12,127,000)    
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 344,124,000   344,124,000   68,945,000
12 Months or More 8,645,000   8,645,000    
Total 352,769,000   352,769,000    
Municipal securities [Member]
          
Held-to-Maturity, Fair Value [Abstract]          
Number of security sold     2    
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 (1,482,000)   (1,482,000)   (165,000)
Fair Value 53,518,000   53,518,000   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    
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (1,482,000)   (1,482,000)   (165,000)
Total (1,482,000)   (1,482,000)    
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 53,518,000   53,518,000   19,835,000
Total $ 53,518,000   $ 53,518,000    
Agency Securities [Member]
          
Held-to-Maturity, Fair Value [Abstract]          
Number of security sold     1    
Mortgage Backed Securities [Member]
          
Held-to-Maturity, Fair Value [Abstract]          
Number of security sold     3