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Equity method investment (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 01, 2016
Feb. 01, 2015
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]          
Core deposits and other intangible assets     $ 42,336 $ 51,130  
Amortization of intangibles     9,793 9,908 $ 10,549
Dividends received from equity method investment     53,020 51,312 33,651
Payments to Acquire Loans Held-for-investment     $ 100,000    
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%        
Core deposits and other intangible assets     $ 7,600 8,800  
Amortization of intangibles     1,200 1,900 2,800
Accretion income     2,100 2,600 2,900
Accretable discount     2,700 4,800  
Common stock issued (in shares) 860,470        
Common stock issued in the purchase agreement (value) $ 39,900        
Dividends received from equity method investment     53,000 51,300 33,700
Line of Credit Facility, Maximum Borrowing Capacity     100,000    
Proceeds from Lines of Credit     $ 0    
Line of Credit Facility, Interest Rate Description     LIBOR plus 225 basis points    
Payments to Acquire Loans Receivable     $ 453,800 $ 337,800 $ 129,800
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   30.00%      
Payments to Acquire Businesses, Gross   $ 75,000      
Additional ownership percentage 10.45%