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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | 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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on the sale and disposal of bank premises and equipment |  |  |  |  |  |  |  |  |  |  |  |  | $ 137 | $ (3) | $ (12)
(Loss) gain on sale of securities |  |  |  |  |  |  |  |  |  |  |  |  | (7) | 17 | (10)
Other operating income |  |  |  |  |  |  |  |  |  |  |  |  | 169 | 114 | 463
Total noninterest income | $ 1,818 | $ 2,219 | $ 1,878 | $ 1,844 | $ 1,609 | $ 1,804 | $ 1,665 | $ 1,801 | $ 1,892 | $ 1,617 | $ 1,598 | $ 1,673 | 7,759 | 6,879 | 6,780
Trust asset management fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | 1,380 | 1,360 | 1,238
Overdrawn account fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | 961 | 995 | 999
Monthly and other service charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | 226 | 223 | 224
Interchange fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | 380 | 361 | 331
ATM fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | 2,431 | 2,240 | 2,046
Brokerage commissions (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | 1,150 | 831 | 865
Secondary market fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | 486 | 306 | 241
Other charges and fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | 412 | 365 | 342
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 4,893 | 4,173 | 3,878
Other operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  |  | 212 | 153 | 190
Noninterest Income | Other charges and fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | $ 446 | $ 435 | $ 395

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