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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other service charges and fees |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,173 | $ 3,878 | $ 3,713
(Loss) on the sale and disposal of bank premises and equipment |  |  |  |  |  |  |  |  |  |  |  |  | (3) | (12) | (10)
Gain (loss) on sale of securities |  |  |  |  |  |  |  |  |  |  |  |  | 17 | (10) | 98
Other operating income |  |  |  |  |  |  |  |  |  |  |  |  | 114 | 463 | 285
Total noninterest income | $ 1,609 | $ 1,804 | $ 1,665 | $ 1,801 | $ 1,892 | $ 1,617 | $ 1,598 | $ 1,673 | $ 1,609 | $ 1,687 | $ 1,738 | $ 1,635 | 6,879 | 6,780 | 6,669
Trust asset management fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | 1,360 | 1,238 | 1,356
Overdrawn account fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | 995 | 999 | 1,003
Monthly and other service charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | 223 | 224 | 224
Interchange fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | 361 | 331 | 296
ATM fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | 2,240 | 2,046 | 2,056
Brokerage commissions (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other service charges and fees |  |  |  |  |  |  |  |  |  |  |  |  | 831 | 865 | 744
Other charges and fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | 671 | 583 | 565
Other service charges and fees |  |  |  |  |  |  |  |  |  |  |  |  | 741 | 636 | 617
Other operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | $ 153 | $ 190 | $ 159

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