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Investments (Tables)
 6 Months Ended
Jun. 30, 2015
Investments [Abstract]  
Schedule of Available-for-sale Securities Reconciliation


June 30, 2015
Amortized
Cost		   Gross
Unrealized
Gains		     Gross
Unrealized
Losses		     Estimated Fair
Value		  
                 
US Government agencies $ 25,815     $ 350     $ (21 )   $ 26,144  
Mortgage-backed securities     378,713       3,541       (2,023 )     380,231  
State and political subdivisions     97,154       2,420       (519 )     99,055  
Other securities     749       740       -     1,489  
Total investment securities   $ 502,431     $ 7,051     $ (2,563 )   $ 506,919  

 

December 31, 2014
Amortized
Cost		   Gross
Unrealized
Gains		     Gross
Unrealized
Losses		     Estimated Fair
Value		  
                 
US Government agencies $ 26,959     $ 334     $ (23 )   $ 27,270  
Mortgage-backed securities     378,339       4,299       (1,196 )     381,442  
State and political subdivisions     98,056       3,093       (200 )     100,949  
Other securities     1,210       1,012       -       2,222  
Total investment securities   $ 504,564     $ 8,738     $ (1,419 )   $ 511,883  


Information Pertaining to Investment Securities Aggregated by Investment Category and Length of Time that Individual Securities in a Continuous Loss Position
June 30, 2015
Less than twelve months Twelve months or more      
    Gross             Gross        
     Unrealized           Unrealized         
    Losses     Fair Value     Losses     Fair Value  
                         
US Government agencies   $ (21 )   $ 2,032     $ -   $ -  
Mortgage-backed securities     (1,551 )     140,272       (472 )     38,258  
State and political subdivisions     (357 )     23,370       (162 )     5,041  
Total   $ (1,929 )   $ 165,674     $ (634 )   $ 43,299  

 

December 31, 2014
Less than twelve months Twelve months or more      
    Gross            Gross         
    Unrealized             Unrealized        
    Losses     Fair Value     Losses     Fair Value  
                         
US Government agencies   $ (23 )   $ 3,485     $ -     $ -  
Mortgage-backed securities     (564 )     84,004       (632 )     51,982  
State and political subdivisions     (31 )     7,738       (169 )     9,045  
Total   $ (618 )   $ 95,227     $ (801 )   $ 61,027  
Realized Gain (Loss) on Investments

 

   Three months ended June 30,        Six months ended June 30,  
    2015       2014       2015        2014   
Proceeds from sales, calls and maturities of securities available for sale $  2,963     $  4,995   $ 22,828   $ 9,660  
Gross gains on sales, calls and maturities of securities available for sale $  307     $  185   $ 522   $ 289  
Gross losses on sales, calls and maturities of securities available for sale    -        (2)       (199 )     (2 )
Net gains on sale of securities available for sale $  307     $  183     $ 323   $ 287  


Investments Classified by Contractual Maturity Date
Estimated Fair Value of Contractual Maturities
(dollars in thousands, unaudited)		    

            
June 30, 2015
     Amortized
Cost
      Fair Value  
   
Maturing within one year   $ 2,758     $ 2,798  
Maturing after one year through five years     237,740       240,900  
Maturing after five years through ten years     68,802       70,006  
Maturing after ten years     50,015       50,431  
             
Investment securities not due at a single maturity date:            
U.S Government agencies collateralized by mortgage obligations     142,367       141,295  
Other securities     749       1,489  
    $ 502,431     $ 506,919  

 

December 31, 2014
     Amortized
Cost 		     Fair Value  
     
Maturing within one year $ 686     $ 694  
Maturing after one year through five years     222,081       225,415  
Maturing after five years through ten years     97,949       99,583  
Maturing after ten years     54,531       55,705  
                 
Investment securities not due at a single maturity date:                
U.S Government agencies collateralized by mortgage obligations     128,107       128,264  
Other securities     1,210       2,222  
    $ 504,564     $ 511,883  
Summary of amortized cost and fair values of general obligation and revenue bonds
June 30, 2015 December 31, 2014       
Amortized Fair Market     Amortized     Fair Market  
General obligation bonds Cost Value     Cost     Value  
State of issuance                        
California   $ 20,624     $ 21,702     $ 20,078     $ 21,288  
Texas     14,261       14,297       14,489       14,675  
Illinois     8,593       8,645       8,272       8,394  
Ohio     7,857       7,865       7,456       7,555  
Washington     5,936       6,055       5,966       6,126  
Utah     955       968       956       984  
Other states     21,987       22,317       21,253       21,832  
Total General Obligation Bonds     80,213       81,849       78,470       80,854  
                             
Revenue bonds                            
State of issuance                            
Utah     4,441       4,440       3,769       3,834  
Texas     3,756       3,842       3,273       3,387  
California     1,605       1,642       2,174       2,233  
Washington     1,166       1,187       1,167       1,197  
Ohio     319       324       321       332  
Illinois     292       291       294       294  
Other states     5,362       5,480       8,588       8,818  
Total Revenue Bonds     16,941       17,206       19,586       20,095  
                             
Total Obligations of States and Political Subdivisions   $ 97,154     $ 99,055     $ 98,056     $ 100,949  
Revenue Bonds by Type
dollars in thousands, unaudited		  
              
     June 30, 2015          December 31, 2014        
Amortized    Fair Market       Amortized        Fair Market  
Revenue bonds Cost   Value       Cost       Value  
Revenue source:                                
Water   $ 3,722     $ 3,780     $ 7,100     $ 7,278  
College & University     3,210       3,296       2,723       2,834  
Sales Tax     2,295       2,322       2,361       2,405  
Electric & Power     1,876       1,891       1,880       1,914  
Lease     2,202       2,178       1,356       1,362  
Other sources     3,636       3,739       4,166       4,302  
Total Revenue Bonds   $ 16,941     $ 17,206     $ 19,586     $ 20,095