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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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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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