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Loans and Allowance for Credit Losses - Additional Information (Details)
 12 Months Ended
Jan. 02, 2020
USD ($)
Dec. 31, 2020
USD ($)
alternative
Loan_modified
Dec. 31, 2019
USD ($)
Loan_modified
Dec. 31, 2018
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Increase (Decrease) in Accounts and Notes Receivable   $ 428,000,000        
Loan purchased amount   3,094,585,000 $ 2,666,616,000      
Accrued interest on loans   15,900,000 12,400,000      
Minimum value of loans individually measured for impairment   $ 250,000,000        
Number of alternatives for measuring impaired loans receivable | alternative   3        
Loans Receivable, Modifications, Still Accruing Interest   $ 4,400,000 2,700,000 $ 2,500,000    
Recorded balance of nonaccrual loans   23,750,000 25,118,000      
Interest Lost on Nonaccrual Loans   921,000 906,000 1,189,000    
Allowance for credit losses   41,910,000 26,911,000 26,189,000   $ 19,977,000
Troubled debt restructurings balance   9,502,000 5,803,000      
Loans receivable, modifications, allowance   1,016,000 381,000      
Real estate acquired through foreclosure   2,489,000 3,644,000      
Mortgage loans secured by real estate In foreclosure   $ 713,000 $ 667,000      
Financial Asset, Equal to or Greater than 90 Days Past Due            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of troubled debt restructurings loan modified | Loan_modified   0 0      
Financial Asset Acquired with Credit Deterioration            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loan purchased amount     $ 4,586,000      
Allowance for credit losses     365,000      
Financing receivable, allowance for credit losses reversed     1,229,000      
ASU 2016-13            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Amortized cost of PCD assets reflected the addition to allowance for credit losses $ 833,000          
Allowance for credit losses         $ 28,583,000  
ASU 2016-13 | Financial Asset Acquired with Credit Deterioration            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Amortized cost of PCD assets reflected the addition to allowance for credit losses $ 833,000          
Allowance for credit losses         28,583,000  
Commercial and Industrial Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Maximum loan-to-value ratio (in hundredths)   80.00%        
Amortization period of loans   seven years        
Loans receivable, time period   one year        
Allowance for credit losses   $ 13,485,000 9,273,000 9,893,000   7,425,000
Troubled debt restructurings balance   $ 2,389,000 1,349,000      
Agricultural            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Maximum loan-to-value ratio (in hundredths)   65.00%        
Amortization period of loans   twenty-five years        
Loans receivable, time period   one year        
Commercial Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Debt coverage ratio   1.20x        
Amortization period of loans   twenty years        
Recorded balance of nonaccrual loans   $ 8,760,000 4,351,000      
Commercial Real Estate | ASU 2016-13            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses         11,739,000  
Commercial Real Estate | ASU 2016-13 | Financial Asset Acquired with Credit Deterioration            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses         11,739,000  
Commercial Real Estate | Minimum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Maximum loan-to-value ratio (in hundredths)   65.00%        
Commercial Real Estate | Maximum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Maximum loan-to-value ratio (in hundredths)   80.00%        
1-4 Family Residential Properties            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Period when loans charged-down   180 days        
Recorded balance of nonaccrual loans   $ 6,930,000 7,379,000      
1-4 Family Residential Properties | ASU 2016-13            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses         2,142,000  
1-4 Family Residential Properties | ASU 2016-13 | Financial Asset Acquired with Credit Deterioration            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses         $ 2,142,000  
Stifel Bank            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loan purchased amount   183,000,000        
Paycheck Protection Program            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loan purchased amount   168,000,000        
Real Estate Loan            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Troubled debt restructurings balance   6,773,000 3,651,000      
Real Estate Loan | Agricultural            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses   $ 1,084,000 $ 1,093,000 $ 1,246,000   $ 1,001,000
Real Estate Loan | Residential Properties            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Maximum loan-to-value ratio (in hundredths)   80.00%        
Amortization period of loans   twenty-five years        
Balloon period   five years        
Unsecured Open-end Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Period when loans charged-down   180 days        
Other Secured Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Period when loans charged-down   120 days