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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments And Contingencies [Abstract]  
Off-Balance Sheet Commitments
    2017   2016
Commitments to extend credit $ 661,021 $ 555,713
Standby letters of credit   12,181   12,689
Leases Future Minimum Payments By Years And In The Aggregate
2018 $ 2,459
2019   2,370
2020   2,217
2021   2,039
2022   1,775
Thereafter   30,815
  $ 41,675