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Pending Acquisition (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]            
Assets $ 3,105,671   $ 3,096,535      
Deposits 2,584,447   2,614,138      
Equity 428,742 $ 412,148 $ 387,352 $ 377,903 $ 371,285 $ 364,879
Choice Bancorp Inc.            
Business Acquisition [Line Items]            
Assets 436,000          
Loans 352,000          
Deposits 306,000          
Equity $ 41,000          
Percentage of assets represented by acquiree 0.14