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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2015
Investment Securities [Abstract]  
Amortized Cost And Fair Value Of Investment Securities
    Amortized   Unrealized   Unrealized   Fair
    Cost   Gains   Losses   Value
December 31, 2015                
Securities available for sale:                
U.S. Government agencies and government                
sponsored enterprises $ 260,748 $ 1,164 $ 1,049 $ 260,863
Mortgage-backed securities:                
Federal National Mortgage Association   209,671   1,092   2,333   208,430
Federal Home Loan Mortgage Corporation   24,564   282   194   24,652
Government National Mortgage Association   26,465   943   4   27,404
Collateralized mortgage obligations:                
Federal National Mortgage Association   16,998   90   154   16,934
Federal Home Loan Mortgage Corporation   5,175   1   91   5,085
Privately issued   -   809   -   809
Total mortgage-backed securities   282,873   3,217   2,776   283,314
Asset-backed securities   -   218   -   218
Total available for sale securities $ 543,621 $ 4,599 $ 3,825 $ 544,395
Securities held to maturity:                
State and political subdivisions   294,423   6,562   4   300,981
Mortgage-backed securities:                
Federal National Mortgage Association   9,242   14   79   9,177
Government National Mortgage Association   25,607   33   159   25,481
Collateralized mortgage obligations:                
Federal National Mortgage Association   56,791   -   818   55,973
Federal Home Loan Mortgage Corporation   80,570   -   1,120   79,450
Government National Mortgage Association   19,084   19   101   19,002
Total mortgage-backed securities   191,294   66   2,277   189,083
Total held to maturity securities $ 485,717 $ 6,628 $ 2,281 $ 490,064
December 31, 2014                
Securities available for sale:                
U.S. Government agencies and government                
sponsored enterprises $ 160,334 $ 1,116 $ 975 $ 160,475
Mortgage-backed securities:                
Federal National Mortgage Association   184,857   2,344   1,264   185,937
Federal Home Loan Mortgage Corporation   29,478   799   7   30,270
Government National Mortgage Association   48,800   2,022   -   50,822
Collateralized mortgage obligations:                
Federal National Mortgage Association   76,247   489   944   75,792
Federal Home Loan Mortgage Corporation   89,623   199   2,585   87,237
Government National Mortgage Association   29,954   598   40   30,512
Privately issued   -   1,218   -   1,218
Total mortgage-backed securities   458,959   7,669   4,840   461,788
Asset-backed securities   -   231   -   231
Total available for sale securities $ 619,293 $ 9,016 $ 5,815 $ 622,494
Securities held to maturity:                
State and political subdivisions   277,273   4,231   120   281,384
Mortgage-backed securities:                
Federal National Mortgage Association   3,279   24   -   3,303
Government National Mortgage Association   13,886   122   -   14,008
Total mortgage-backed securities   17,165   146   -   17,311
Total held to maturity securities $ 294,438 $ 4,377 $ 120 $ 298,695
Interest And Dividends On Securities
    2015   2014   2013
Taxable interest and dividends $ 16,123 $ 13,304 $ 12,541
Tax-exempt interest and dividends   5,752   5,298   4,922
Total interest and dividends on securities $ 21,875 $ 18,602 $ 17,463
Scheduled Maturities Of Securities Available For Sale And Securities Held To Maturity
Amortized Fair
    Cost   Value
Debt securities available for sale:        
Due in one year or less $ 25,182 $ 25,241
Due from one to five years   174,053   173,336
Due after five years through ten years   275,972   276,660
Due after ten years   68,414   69,158
  $ 543,621 $ 544,395
Debt securities held to maturity:        
Due in one year or less $ 22,188 $ 22,261
Due from one to five years   172,094   175,650
Due after five years through ten years   116,362   119,183
Due after ten years   175,073   172,970
  $ 485,717 $ 490,064
Sales And Calls Of Securities Available For Sale
    2015   2014   2013
Proceeds from sales $ 54,277 $ 81,600 $ 1,327
Gross realized gains   2,000   2,043   1,226
Gross realized losses   12   2   -
Investments' Gross Unrealized Losses And Fair Value
    Less than 12 months   12 months or longer   Total
    Fair   Unrealized   Fair  Unrealized   Fair  Unrealized
    Value   Losses   Value   Losses   Value   Losses
December 31, 2015                        
Securities available for sale:                        
U.S. Government agencies and government                        
sponsored enterprises $ 82,298 $ 735 $ 26,302 $ 314 $ 108,600 $ 1,049
Mortgage-backed securities:                        
Federal National Mortgage Association   123,774   2,134   9,562   199   133,336   2,333
Federal Home Loan Mortgage Corporation   12,660   194   -   -   12,660   194
Government National Mortgage Association   1,405   4   -   -   1,405   4
Collateralized mortgage obligations:                        
Federal National Mortgage Association   7,778   154   -   -   7,778   154
Federal Home Loan Mortgage Corporation   4,998   91   -   -   4,998   91
Total mortgage-backed securities   150,615   2,577   9,562   199   160,177   2,776
Total available for sale securities   232,913   3,312   35,864   513   268,777   3,825
Securities held to maturity:                        
State and political subdivisions   3,075   4   -   -   3,075   4
Mortgage-backed securities:                        
Federal National Mortgage Association   5,666   79   -   -   5,666   79
Government National Mortgage Association   8,790   159   -   -   8,790   159
Collateralized mortgage obligations:                        
Federal National Mortgage Association   55,973   818   -   -   55,973   818
Federal Home Loan Mortgage Corporation   79,323   1,120   -   -   79,323   1,120
Government National Mortgage Association   14,559   101   -   -   14,559   101
Total mortgage-backed securities   164,311   2,277   -   -   164,311   2,277
Total held to maturity securities   167,386   2,281   -   -   167,386   2,281
Total temporarily impaired securities $ 400,299 $ 5,593 $ 35,864 $ 513 $ 436,163 $ 6,106
 
December 31, 2014                        
Securities available for sale:                        
U.S. Government agencies and government                        
sponsored enterprises $ 34,995 $ 77 $ 41,070 $ 898 $ 76,065 $ 975
Mortgage-backed securities:                        
Federal National Mortgage Association   2,242   8   62,592   1,256   64,834   1,264
Federal Home Loan Mortgage Corporation   3,387   7   -   -   3,387   7
Collateralized mortgage obligations:                        
Federal National Mortgage Association   11,228   24   25,644   920   36,872   944
Federal Home Loan Mortgage Corporation   -   -   76,126   2,585   76,126   2,585
Government National Mortgage Association   -   -   2,510   40   2,510   40
Total mortgage-backed securities   16,857   39   166,872   4,801   183,729   4,840
Total available for sale securities   51,852   116   207,942   5,699   259,794   5,815
Securities held to maturity:                        
State and political subdivisions   18,036   120   -   -   18,036   120
Total temporarily impaired securities $ 69,888 $ 236 $ 207,942 $ 5,699 $ 277,830 $ 5,935