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Investments (Tables)
 3 Months Ended
Mar. 31, 2020
Investments [Abstract]  
Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities
March 31, 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  $500  $2  $—  $502  
Obligations of states and     
political subdivisions121,684  4,896  630  125,950  112,393  4,800  6  117,187  
Mortgage-backed securities:     
U.S. government agencies718,679  41,318  532  759,465  631,637  12,292  1,825  642,104  
Private label10,669  269  76  10,862  10,896  589  —  11,485  
Trust preferred securities4,549  —  1,149  3,400  4,781  27  347  4,461  
Corporate securities31,618  465  390  31,693  31,669  500  43  32,126  
Total Debt Securities887,699  46,950  2,777  931,872  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$889,940  $46,950  $2,777  $934,113  $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):
March 31, 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$17,990  $629  $320  $1  $18,310  $630  
Mortgage-backed securities:  
U.S. Government agencies64,404  511  4,780  21  69,184  532  
Private Label5,540  76  —  —  5,540  76  
Trust preferred securities —  —  3,400  1,149  3,400  1,149  
Corporate securities15,193  390  —  —  15,193  390  
Total available-for-sale$103,127  $1,606  $8,500  $1,171  $111,627  $2,777  

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 March 31, 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$2,091  $2,108  
Due after one year through five years14,955  15,386  
Due after five years through ten years235,144  248,975  
Due after ten years635,509  665,403  
Total$887,699  $931,872  
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 March 31,
20202019
Gross realized gains on securities sold$134  $89  
Gross realized losses on securities sold(71) (1) 
Net investment security (losses) gains$63  $88  
Gross unrealized gains recognized on equity securities still held$24  $143  
Gross unrealized losses recognized on equity securities still held(2,426) (68) 
Net unrealized (losses) gains recognized on equity securities still held$(2,402) $75