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Investment Securities (Tables)
6 Months Ended
Jun. 30, 2015
Investment Securities [Abstract]  
Amortized Cost And Fair Value Of Investment Securities
    Amortized   Unrealized   Unrealized   Fair
    Cost   Gains   Losses   Value
June 30, 2015                
Securities available for sale:                
U.S. Government agencies and government                
sponsored enterprises $ 271,774 $ 777 $ 2,474 $ 270,077
Mortgage-backed securities:                
Federal National Mortgage Association   227,129   1,933   2,307   226,755
Federal Home Loan Mortgage Corporation   28,840   501   204   29,137
Government National Mortgage Association   43,804   1,728   -   45,532
Collateralized mortgage obligations:                
Federal National Mortgage Association   83,447   514   1,132   82,829
Federal Home Loan Mortgage Corporation   95,268   186   2,752   92,702
Government National Mortgage Association   23,828   470   39   24,259
Privately issued   -   1,123   -   1,123
Total collateralized mortgage obligations   202,543   2,293   3,923   200,913
Total mortgage-backed securities   502,316   6,455   6,434   502,337
Asset-backed securities   -   225   -   225
Total available for sale securities $ 774,090 $ 7,457 $ 8,908 $ 772,639
Securities held to maturity:                
State and political subdivisions   289,713   4,790   451   294,052
Mortgage-backed securities:                
Federal National Mortgage Association   9,280   6   86   9,200
Government National Mortgage Association   21,827   5   211   21,621
Total mortgage-backed securities   31,107   11   297   30,821
Total held to maturity securities $ 320,820 $ 4,801 $ 748 $ 324,873
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 collateralized mortgage obligations   195,824   2,504   3,569   194,759
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
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 $ 30,008 $ 30,008
Due from one to five years   166,519   166,266
Due after five years through ten years   328,808   328,993
Due after ten years   248,755   247,372
  $ 774,090 $ 772,639
Debt securities held to maturity:        
Due in one year or less $ 24,064 $ 24,158
Due from one to five years   161,041   164,083
Due after five years through ten years   107,099   108,259
Due after ten years   28,616   28,373
  $ 320,820 $ 324,873
Sales And Calls Of Securities Available For Sale
  Three months ended   Six months ended
  June 30,   June 30,
   2015   2014   2015   2014
Proceeds from sales $ - $ 41,958 $ 29,508 $ 61,428
Gross realized gains   -   949   1,073   1,262
Gross realized losses   -   -   11   -
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
June 30, 2015                        
Securities available for sale:                        
U.S. Government agencies and government                        
sponsored enterprises $ 162,940 $ 2,110 $ 24,637 $ 364 $ 187,577 $ 2,474
Mortgage-backed securities:                        
Federal National Mortgage Association   93,817   1,779   34,433   528   128,250   2,307
Federal Home Loan Mortgage Corporation   6,005   204   -   -   6,005   204
Collateralized mortgage obligations:                        
Federal National Mortgage Association   24,181   271   19,886   861   44,067   1,132
Federal Home Loan Mortgage Corporation   21,765   484   61,553   2,268   83,318   2,752
Government National Mortgage Association   -   -   2,306   39   2,306   39
Total collateralized mortgage obligations   45,946   755   83,745   3,168   129,691   3,923
Total mortgage-backed securities   145,768   2,738   118,178   3,696   263,946   6,434
Total available for sale securities   308,708   4,848   142,815   4,060   451,523   8,908
Securities held to maturity:                        
State and political subdivisions   35,997   451   -   -   35,997   451
Mortgage-backed securities:           -   -        
Federal National Mortgage Association   5,724   86   -   -   5,724   86
Government National Mortgage Association   15,328   211   -   -   15,328   211
Total held to maturity securities   57,049   748   -   -   57,049   748
Total temporarily impaired securities $ 365,757 $ 5,596 $ 142,815 $ 4,060 $ 508,572 $ 9,656
    Less than 12 months   12 months or longer   Total  
    Fair   Unrealized   Fair Unrealized    Fair Unrealized 
    Value   Losses   Value   Losses   Value   Losses
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 collateralized mortgage obligations   11,228   24   104,280   3,545   115,508   3,569
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