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Equity method investment (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 01, 2016
Feb. 01, 2015
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]          
Core deposits and other intangible assets     $ 33,819 $ 42,336  
Amortization of intangibles     8,518 9,793 $ 9,908
Dividends received from equity method investment     69,996 53,020 51,312
Loans     $ 23,414,262 22,424,501  
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     $ 6,800 7,600  
Amortization of intangibles     752 1,200 1,900
Accretion income     1,500 2,100 2,600
Accretable discount     1,200 2,700  
Dividends received from equity method investment     70,000 53,000 51,300
Line of Credit Facility, Maximum Borrowing Capacity     100,000    
Proceeds from Lines of Credit     $ 47,200    
Line of Credit Facility, Interest Rate Description     SOFR plus 200 basis points    
Commercial loans held for sale sold     $ 646,600 453,800 337,800
Payments to Acquire Loans Held-for-investment     276,700 100,000 $ 0
Loans     $ 319,100 $ 95,800  
Bankers Healthcare Group, LLC | Bankers Healthcare Group, LLC          
Schedule of Equity Method Investments [Line Items]          
Common stock issued (in shares) 860,470        
Common stock issued in the purchase agreement (value) $ 39,900        
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%