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Investments (Tables)
 6 Months Ended
Jun. 30, 2020
Investments [Abstract]  
Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities
June 30, 2020December 31, 2019
Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair ValueAmortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Securities available-for-sale:        
U.S. Treasuries and U.S.        
government agencies$—  $—  $—  $—  $500  $2  $—  $502  
Obligations of states and     
political subdivisions211,439  7,383  595  218,227  112,393  4,800  6  117,187  
Mortgage-backed securities:     
U.S. government agencies746,148  40,638  279  786,507  631,637  12,292  1,825  642,104  
Private label10,477  876  4  11,349  10,896  589  —  11,485  
Trust preferred securities4,551  —  1,071  3,480  4,781  27  347  4,461  
Corporate securities31,568  1,857  44  33,381  31,669  500  43  32,126  
Total Debt Securities1,004,183  50,754  1,993  1,052,944  791,876  18,210  2,221  807,865  
Certificates of deposit held for investment2,241  —  —  2,241  2,241  —  —  2,241  
Total Securities Available-for-Sale$1,006,424  $50,754  $1,993  $1,055,185  $794,117  $18,210  $2,221  $810,106  
Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities
Securities held-to-maturity:        
Mortgage-backed securities:
U.S. government agencies$—  $—  $—  $—  $49,036  $1,562  $—  $50,598  
Total Securities Held-to-Maturity$—  $—  $—  $—  $49,036  $1,562  $—  $50,598  
Gross Unrealized Losses And Fair Value Of Investments The following table shows the gross unrealized losses and fair value of the Company’s investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):
June 30, 2020
Less Than Twelve MonthsTwelve Months or GreaterTotal
Estimated Fair ValueUnrealized LossEstimated Fair ValueUnrealized LossEstimated Fair ValueUnrealized Loss
Securities available-for-sale:      
Obligations of states and political subdivisions$35,005  $595  $—  $—  $35,005  $595  
Mortgage-backed securities:  
U.S. Government agencies83,810  279  38  —  83,848  279  
Private Label275  4  —  —  275  4  
Trust preferred securities —  —  3,480  1,071  3,480  1,071  
Corporate securities445  44  —  —  445  44  
Total available-for-sale$119,535  $922  $3,518  $1,071  $123,053  $1,993  

December 31, 2019
Less Than Twelve MonthsTwelve Months or GreaterTotal
Estimated Fair ValueUnrealized LossEstimated Fair ValueUnrealized LossEstimated Fair ValueUnrealized Loss
Securities available-for-sale:      
Obligations of states and political subdivisions$230  $—  $1,439  $6  $1,669  $6  
Mortgage-backed securities:  
U.S. Government agencies123,289  1,247  34,746  578  158,035  1,825  
Trust preferred securities4,200  347  —  —  4,200  347  
Corporate securities11,248  43  —  —  11,248  43  
Total available-for-sale$138,967  $1,637  $36,185  $584  $175,152  $2,221  
Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity The amortized cost and estimated fair value of debt securities at June 30, 2020, by contractual maturity, are shown in the following table (in thousands).  Expected maturities will differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.  Mortgage-backed securities have been allocated to their respective maturity groupings based on their contractual maturity.
Amortized CostEstimated Fair Value
Available-for-Sale Debt Securities  
Due in one year or less$2,050  $2,062  
Due after one year through five years15,327  15,900  
Due after five years through ten years294,981  312,351  
Due after ten years691,825  722,631  
Total$1,004,183  $1,052,944  
Gross Gains And Losses Realized
Gross gains and gross losses recognized by the Company from investment security transactions are summarized in the table below (in thousands):
Three months ended June 30,Six months ended June 30,
2020201920202019
Gross realized gains on securities sold$—  $21  $133  $110  
Gross realized losses on securities sold(6) —  (77) (1) 
Net investment security (losses) gains$(6) $21  $56  $109  
Gross unrealized gains recognized on equity securities still held$242  $113  $36  $241  
Gross unrealized losses recognized on equity securities still held—  —  (2,195) (53) 
Net unrealized gains (losses) recognized on equity securities still held$242  $113  $(2,159) $188