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Business Combinations (Narrative) (Details)
$ in Thousands
6 Months Ended
Apr. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jul. 13, 2018
USD ($)
Business Acquisition [Line Items]      
Useful life   17 years  
Acquisition related costs   $ 1,900  
Capital One [Member]      
Business Acquisition [Line Items]      
Assets under management     $ 4,000,000
Assets under management and administration     10,400,000
Cash for customer deposit liabilities assumed     $ 217,000
Assets   30,365  
Deposit liabilities   217,432  
Trust And Asset Management Acquisition [Member]      
Business Acquisition [Line Items]      
Trust fee revenue   10,100  
Related expense   9,800  
MidSouth [Member]      
Business Acquisition [Line Items]      
Assets   1,700,000  
Loans   900,000  
Deposit liabilities   $ 1,400,000  
Fixed conversion ratio 0.2952    
Business combination transaction value on an average of share price $ 213,000