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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Commitments And Contingencies [Abstract]  
Off-Balance Sheet Commitments
    2016   2015
Commitments to extend credit $ 555,713 $ 514,818
Standby letters of credit   12,689   11,746
Leases Future Minimum Payments By Years And In The Aggregate
2017 $ 2,173
2018   2,201
2019   2,125
2020   1,999
2021   1,823
Thereafter   30,885
  $ 41,206