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Acquisitions (Details)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
May 18, 2020
USD ($)
Nov. 08, 2019
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
Branch
Dec. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Nov. 07, 2019
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]                  
Acquisition     $ 0 $ 44,594          
Assets     4,541,228 3,577,260          
Deposits     3,537,805 2,954,453          
Equity     532,853 $ 516,990 $ 511,740   $ 412,148 $ 399,593 $ 387,352
Commerce Financial Holdings, Inc.                  
Business Acquisition [Line Items]                  
Common stock surrendered $ 100                
Commerce Financial Holdings, Inc.                  
Business Acquisition [Line Items]                  
Termination costs $ 500                
Merger Agreement | Choice Bancorp Inc.                  
Business Acquisition [Line Items]                  
Common stock issued for consideration (in shares) | shares   1,184,102              
Number of common stock for each outstanding share of common stock   0.00497              
Value of common stock issued for consideration   $ 79,800              
Price per share for stock issued in consideration (in dollars per share) | $ / shares   $ 67.39              
Value of cash consideration   $ 1,700              
Direct stock issuance costs for the merger charged against additional paid in capital   200              
Amount of addition in assets   457,000              
Amount of addition in loans   348,000              
Amount of addition in deposits   289,000              
Acquisition   45,000              
Merger Agreement | Choice Bancorp Inc. | Core deposit intangibles                  
Business Acquisition [Line Items]                  
Intangible assets assumed   $ 1,700              
Choice Bancorp Inc.                  
Business Acquisition [Line Items]                  
Percentage of assets represented by acquiree           0.12      
Advantage Community Bancshares, Inc.                  
Business Acquisition [Line Items]                  
Assets     160,000            
Loans     89,000            
Deposits     135,000            
Equity     $ 21,000            
Number Of Branches | Branch     4