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Revenue from Contracts with Customers (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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
TOTAL NONINTEREST INCOME | $ 6,705 | $ 6,478 | $ 6,306 | $ 6,010 | $ 6,051 | $ 6,058 | $ 6,055 | $ 5,887 | $ 25,499 | $ 24,051 | $ 23,244
Service Charges on Deposit Accounts |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 4,254 | 4,077 | 4,010
Debit Card and EFT Fees |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 3,351 | 3,089 | 2,661
Trust Fees |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 7,126 | 6,431 | 6,235
Insurance Agency Commissions |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 2,621 | 2,407 | 1,560
Retirement Plan Consulting Fees |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 1,684 | 1,857 | 1,990
Investment Commissions |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 1,103 | 919 | $ 1,210
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
TOTAL NONINTEREST INCOME |  |  |  |  |  |  |  |  | 25,499 | 24,051 |
Operating Segments | Trust Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
TOTAL NONINTEREST INCOME |  |  |  |  |  |  |  |  | 7,126 | 6,431 |
Operating Segments | Bank Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
TOTAL NONINTEREST INCOME |  |  |  |  |  |  |  |  | 16,689 | 15,763 |
Operating Segments | Retirement Consulting Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
TOTAL NONINTEREST INCOME |  |  |  |  |  |  |  |  | 1,684 | 1,857 |
Operating Segments | Service Charges on Deposit Accounts |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 4,254 | 4,077 |
Operating Segments | Service Charges on Deposit Accounts | Trust Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 0 | 0 |
Operating Segments | Service Charges on Deposit Accounts | Bank Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 4,254 | 4,077 |
Operating Segments | Service Charges on Deposit Accounts | Retirement Consulting Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 0 | 0 |
Operating Segments | Debit Card and EFT Fees |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 3,351 | 3,089 |
Operating Segments | Debit Card and EFT Fees | Trust Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 0 | 0 |
Operating Segments | Debit Card and EFT Fees | Bank Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 3,351 | 3,089 |
Operating Segments | Debit Card and EFT Fees | Retirement Consulting Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 0 | 0 |
Operating Segments | Trust Fees |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 7,126 | 6,431 |
Operating Segments | Trust Fees | Trust Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 7,126 | 6,431 |
Operating Segments | Trust Fees | Bank Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 0 | 0 |
Operating Segments | Trust Fees | Retirement Consulting Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 0 | 0 |
Operating Segments | Insurance Agency Commissions |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 2,621 | 2,407 |
Operating Segments | Insurance Agency Commissions | Trust Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 0 | 0 |
Operating Segments | Insurance Agency Commissions | Bank Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 2,621 | 2,407 |
Operating Segments | Insurance Agency Commissions | Retirement Consulting Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 0 | 0 |
Operating Segments | Retirement Plan Consulting Fees |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 1,684 | 1,857 |
Operating Segments | Retirement Plan Consulting Fees | Trust Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 0 | 0 |
Operating Segments | Retirement Plan Consulting Fees | Bank Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 0 | 0 |
Operating Segments | Retirement Plan Consulting Fees | Retirement Consulting Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 1,684 | 1,857 |
Operating Segments | Investment Commissions |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 1,103 | 919 |
Operating Segments | Investment Commissions | Trust Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 0 | 0 |
Operating Segments | Investment Commissions | Bank Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 1,103 | 919 |
Operating Segments | Investment Commissions | Retirement Consulting Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 0 | 0 |
Operating Segments | Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 5,360 | 5,271 |
Operating Segments | Other | Trust Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 0 | 0 |
Operating Segments | Other | Bank Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 5,360 | 5,271 |
Operating Segments | Other | Retirement Consulting Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | $ 0 | $ 0 |

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