Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
TOTAL NONINTEREST INCOME	$ 10,682	$ 9,467	$ 9,136	$ 7,870	$ 7,647	$ 7,441	$ 6,994	$ 6,520	$ 37,155	$ 28,602	$ 25,499
Service Charges on Deposit Accounts
Disaggregation Of Revenue [Line Items]
Noninterest income									3,682	4,514	4,254
Debit Card and EFT Fees
Disaggregation Of Revenue [Line Items]
Noninterest income									3,927	3,522	3,351
Trust Fees
Disaggregation Of Revenue [Line Items]
Noninterest income									7,632	7,475	7,126
Insurance Agency Commissions
Disaggregation Of Revenue [Line Items]
Noninterest income									3,124	2,919	2,621
Retirement Plan Consulting Fees
Disaggregation Of Revenue [Line Items]
Noninterest income									1,523	1,489	1,684
Investment Commissions
Disaggregation Of Revenue [Line Items]
Noninterest income									1,530	1,406	1,103
Operating Segments
Disaggregation Of Revenue [Line Items]
TOTAL NONINTEREST INCOME									37,155	28,602	25,499
Operating Segments | Service Charges on Deposit Accounts
Disaggregation Of Revenue [Line Items]
Noninterest income									3,682	4,514	4,254
Operating Segments | Debit Card and EFT Fees
Disaggregation Of Revenue [Line Items]
Noninterest income									3,927	3,522	3,351
Operating Segments | Trust Fees
Disaggregation Of Revenue [Line Items]
Noninterest income									7,632	7,475	7,126
Operating Segments | Insurance Agency Commissions
Disaggregation Of Revenue [Line Items]
Noninterest income									3,124	2,919	2,621
Operating Segments | Retirement Plan Consulting Fees
Disaggregation Of Revenue [Line Items]
Noninterest income									1,523	1,489	1,684
Operating Segments | Investment Commissions
Disaggregation Of Revenue [Line Items]
Noninterest income									1,530	1,406	1,103
Operating Segments | Other
Disaggregation Of Revenue [Line Items]
Other (outside the scope of ASC 606)									15,737	7,277	5,360
Operating Segments | Trust Segment
Disaggregation Of Revenue [Line Items]
TOTAL NONINTEREST INCOME									9,155	8,964	8,810
Operating Segments | Trust Segment | Service Charges on Deposit Accounts
Disaggregation Of Revenue [Line Items]
Noninterest income									0	0	0
Operating Segments | Trust Segment | Debit Card and EFT Fees
Disaggregation Of Revenue [Line Items]
Noninterest income									0	0	0
Operating Segments | Trust Segment | Trust Fees
Disaggregation Of Revenue [Line Items]
Noninterest income									7,632	7,475	7,126
Operating Segments | Trust Segment | Insurance Agency Commissions
Disaggregation Of Revenue [Line Items]
Noninterest income									0	0	0
Operating Segments | Trust Segment | Retirement Plan Consulting Fees
Disaggregation Of Revenue [Line Items]
Noninterest income									1,523	1,489	1,684
Operating Segments | Trust Segment | Investment Commissions
Disaggregation Of Revenue [Line Items]
Noninterest income									0	0	0
Operating Segments | Trust Segment | Other
Disaggregation Of Revenue [Line Items]
Other (outside the scope of ASC 606)									0	0	0
Operating Segments | Bank Segment
Disaggregation Of Revenue [Line Items]
TOTAL NONINTEREST INCOME									28,000	19,638	16,689
Operating Segments | Bank Segment | Service Charges on Deposit Accounts
Disaggregation Of Revenue [Line Items]
Noninterest income									3,682	4,514	4,254
Operating Segments | Bank Segment | Debit Card and EFT Fees
Disaggregation Of Revenue [Line Items]
Noninterest income									3,927	3,522	3,351
Operating Segments | Bank Segment | Trust Fees
Disaggregation Of Revenue [Line Items]
Noninterest income									0	0	0
Operating Segments | Bank Segment | Insurance Agency Commissions
Disaggregation Of Revenue [Line Items]
Noninterest income									3,124	2,919	2,621
Operating Segments | Bank Segment | Retirement Plan Consulting Fees
Disaggregation Of Revenue [Line Items]
Noninterest income									0	0	0
Operating Segments | Bank Segment | Investment Commissions
Disaggregation Of Revenue [Line Items]
Noninterest income									1,530	1,406	1,103
Operating Segments | Bank Segment | Other
Disaggregation Of Revenue [Line Items]
Other (outside the scope of ASC 606)									$ 15,737	$ 7,277	$ 5,360