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Long-Term Debt and Other Borrowed Funds (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument      
Long-term debt and capital lease obligations $ 13,900,000 $ 15,800,000  
Fiscal Year Maturities of Long-term Debt      
2018 100,000    
2019 100,000    
2020 5,100,000    
2021 100,000    
2022 100,000    
Thereafter 8,400,000    
Long-term debt and capital lease obligations 13,900,000 $ 15,800,000  
Advances from FHLB 0   $ 0
Other borrowings 0    
Subordinated term loan | Subordinated Term Loan, 6.81% | Parent Company      
Debt Instrument      
Stated interest rate     6.81%
Capital lease obligations | Capital Lease Obligation, 8.00% | Subsidiaries      
Debt Instrument      
Stated interest rate   8.00%  
Capital Lease Obligations 1,200,000 $ 1,300,000  
Notes payable | Subsidiaries      
Fiscal Year Maturities of Long-term Debt      
Long Term Debt, Acquired or Assumed 12,600,000 $ 14,400,000  
Notes payable | Note Payable, 6.24% | Subsidiaries      
Debt Instrument      
Stated interest rate   6.24%  
Long-term debt 0 $ 1,800,000  
Notes payable | Note Payable, 2.28% | Subsidiaries      
Debt Instrument      
Stated interest rate   2.28%  
Long-term debt 5,000,000.0 $ 5,000,000.0  
Notes payable | Note Payable, 1.00% | Subsidiaries      
Debt Instrument      
Stated interest rate   1.00%  
Long-term debt 5,100,000 $ 5,100,000  
Notes payable | Note Payable, 1.30%, maturing March 31, 2038 [Member] | Subsidiaries      
Debt Instrument      
Long-term debt 2,000,000.0 2,000,000.0  
Notes payable | Note Payable, 1.30%, Maturing June 1, 2034 [Member] | Subsidiaries      
Debt Instrument      
Long-term debt 600,000 $ 600,000  
Federal Home Loan Bank | Notes Payable to FHLB | Subsidiaries      
Fiscal Year Maturities of Long-term Debt      
FHLB, advances, maximum amount available $ 1,616,000,000.0    
Secured Debt      
Fiscal Year Maturities of Long-term Debt      
Ownership percentage in subsidiary 99.90%    
Line of credit facility, maximum borrowing capacity $ 455,600,000    
Federal Funds Purchased      
Fiscal Year Maturities of Long-term Debt      
Line of credit facility, maximum borrowing capacity 205,000,000.0    
Unsecured Debt [Member]      
Fiscal Year Maturities of Long-term Debt      
Line of credit facility, maximum borrowing capacity $ 50,000,000.0    
Minimum | Note Payable, 6.24% | Subsidiaries      
Debt Instrument      
Stated interest rate 1.00%    
Maximum [Member] | Note Payable, 6.24% | Subsidiaries      
Debt Instrument      
Stated interest rate 6.24%