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Revenue Recognition (Summary of Revenue) (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
Revenue from Contract with Customer [Abstract]                      
Percentage of total revenue excluded from adoption of 606                 83.00% 85.00% 86.00%
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 $ 45,532 $ 41,354 $ 37,284
Other income                 26,899 22,440 21,392
Total non-interest income $ 20,448 $ 20,626 $ 14,365 $ 16,991 $ 17,725 $ 18,047 $ 15,834 $ 12,188 72,431 63,794 58,676
Wealth management fees                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 25,733 22,503 17,957
Insurance agency income                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 3,513 0 0
Service charges on deposit accounts                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 10,312 13,117 13,330
Debit card and ATM fees                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 5,974 5,734 5,997
Banking service charges and other fees                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 $ 16,286 $ 18,851 $ 19,327