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Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Other noninterest income - ASC 606 $ 939 $ 974
Total noninterest income in scope of ASC 606 16,774 16,037
Total noninterest income out of scope of ASC 606 4,759 3,826
Noninterest Income 21,533 19,863
Deposit Account [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 4,406 4,431
Credit Card, Merchant Discount [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 3,735 3,405
ATM Charge [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 666 654
Investment Advisory, Management and Administrative Service [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 6,069 5,582
Investment Advisory, Retail Investment and Insurance Service [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 679 560
Merchant Processing [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax $ 280 $ 431