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Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill $ 543,199   $ 445,355 $ 445,355
MBT        
Business Acquisition [Line Items]        
Cash and cash equivalents   $ 10,222    
Interest-bearing time deposits   281,228    
Investment securities   212,235    
Loans   731,260    
Premises and equipment   21,664    
Federal Home Loan Bank stock   4,148    
Interest receivable   3,361    
Cash surrender value of life insurance   59,545    
Tax asset, deferred and receivable   4,970    
Other assets   7,737    
Deposits   (1,105,926)    
Securities sold under repurchase agreements   (94,760)    
Federal Home Loan Bank advances   (10,853)    
Other liabilities   (9,261)    
Net tangible assets acquired   115,570    
Core deposit intangible   16,527    
Goodwill   97,844    
Purchase price   $ 229,941