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Equity method investment (Details)
$ in Thousands
12 Months Ended
Mar. 01, 2016
USD ($)
shares
Feb. 01, 2015
USD ($)
Rate
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]          
Core deposits and other intangible assets     $ 51,130 $ 46,161  
Amortization of intangibles     9,908 10,549 $ 8,816
Dividends received from equity method investment     $ 51,312 33,651 21,650
Bankers Healthcare Group, LLC          
Schedule of Equity Method Investments [Line Items]          
Equity Method Investment, Ownership Percentage     49.00%    
Payments to Acquire Businesses, Gross $ 74,100        
Additional ownership percentage 19.00%        
Number of board of managers designated by bank 2        
Number of board managers 5        
Core deposits and other intangible assets     $ 8,800 10,700  
Amortization of intangibles     1,900 2,800 3,300
Accretion income     2,600 2,900 3,100
Accretable discount     4,800 7,400  
Common stock issued (in shares) | shares 860,470        
Common stock issued in the purchase agreement (value) $ 39,900        
Dividends received from equity method investment     51,300 33,700 21,700
Line of Credit Facility, Maximum Borrowing Capacity     60,000    
Proceeds from Lines of Credit     $ 10,000    
Line of Credit Facility, Interest Rate Description     LIBOR plus 225 basis points    
Payments to Purchase Other Loans Held-for-sale     $ 337,800 $ 129,800 $ 10,300
Bankers Healthcare Group, LLC | Pinnacle Financial          
Schedule of Equity Method Investments [Line Items]          
Additional ownership percentage 8.55%        
Bankers Healthcare Group, LLC | Pinnacle Bank          
Schedule of Equity Method Investments [Line Items]          
Equity Method Investment, Ownership Percentage | Rate   30.00%      
Payments to Acquire Businesses, Gross   $ 75,000      
Additional ownership percentage 10.45%