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Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Other noninterest income - ASC 606 $ 1,152 $ 1,188 $ 3,186 $ 3,269
Total noninterest income in scope of ASC 606 17,369 16,305 50,842 47,626
Total noninterest income out of scope of ASC 606 5,895 4,465 14,172 13,454
Noninterest Income 23,264 20,770 65,014 61,080
Deposit Account [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 4,658 4,401 13,640 13,337
Credit Card, Merchant Discount [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3,943 3,597 11,267 10,279
ATM Charge [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 825 815 2,215 2,261
Investment Advisory, Management and Administrative Service [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 5,912 5,402 17,577 16,027
Investment Advisory, Retail Investment and Insurance Service [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 652 565 1,951 1,549
Merchant Processing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 227 $ 337 $ 1,006 $ 904