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Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation Of Revenue [Line Items]    
Service charges on deposit accounts $ 1,003 $ 951
Debit card and EFT fees 806 653
Trust fees 1,807 1,678
Insurance agency commissions 699 674
Retirement plan consulting fees 379 513
Investment commissions 256 222
Other [1] 1,060 1,196
TOTAL NONINTEREST INCOME 6,010 5,887
Trust Segment | Operating Segments    
Disaggregation Of Revenue [Line Items]    
Service charges on deposit accounts 0 0
Debit card and EFT fees 0 0
Trust fees 1,807 1,678
Insurance agency commissions 0 0
Retirement plan consulting fees 0 0
Investment commissions 0 0
Other [1] 0 0
TOTAL NONINTEREST INCOME 1,807 1,678
Bank Segment | Operating Segments    
Disaggregation Of Revenue [Line Items]    
Service charges on deposit accounts 1,003 951
Debit card and EFT fees 806 653
Trust fees 0 0
Insurance agency commissions 699 674
Retirement plan consulting fees 0 0
Investment commissions 256 222
Other [1] 1,060 1,196
TOTAL NONINTEREST INCOME 3,824 3,696
Retirement Consulting Segment | Operating Segments    
Disaggregation Of Revenue [Line Items]    
Service charges on deposit accounts 0 0
Debit card and EFT fees 0 0
Trust fees 0 0
Insurance agency commissions 0 0
Retirement plan consulting fees 379 513
Investment commissions 0 0
Other [1] 0 0
TOTAL NONINTEREST INCOME $ 379 $ 513
[1] Not within the scope of ASC 606.