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Long-Term Debt and Other Borrowed Funds (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument    
Long-term debt and capital lease obligations $ 15,800,000 $ 13,100,000
Fiscal Year Maturities of Long-term Debt    
2018 100,000  
2019 100,000  
2020 100,000  
2021 5,100,000  
2022 100,000  
Thereafter 10,300,000  
Long-term debt and capital lease obligations 15,800,000 13,100,000
Advances from FHLB 0 0
Other borrowings $ 0 $ 20,000,000
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 $ 1,300,000 $ 1,400,000
Notes payable | Subsidiaries    
Fiscal Year Maturities of Long-term Debt    
Long Term Debt, Acquired or Assumed $ 11,700,000 14,400,000
Notes payable | Note Payable, 6.24% | Subsidiaries    
Debt Instrument    
Stated interest rate 6.24%  
Long-term debt $ 1,800,000 1,600,000
Notes payable | Note Payable, 2.28% | Subsidiaries    
Debt Instrument    
Stated interest rate 2.28%  
Long-term debt $ 5,000,000 5,000,000
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
Notes payable | Note Payable, 1.30%, Maturing June 1, 2034 [Member] | Subsidiaries    
Debt Instrument    
Long-term debt 600,000 $ 0
Federal Home Loan Bank | Notes Payable to FHLB | Subsidiaries    
Fiscal Year Maturities of Long-term Debt    
FHLB, advances, maximum amount available $ 1,399,000,000  
Secured Debt    
Fiscal Year Maturities of Long-term Debt    
Ownership percentage in subsidiary 99.90%  
Line of credit facility, maximum borrowing capacity $ 461,700,000  
Federal Funds Purchased    
Fiscal Year Maturities of Long-term Debt    
Line of credit facility, maximum borrowing capacity 205,000,000  
Unsecured Debt [Member]    
Fiscal Year Maturities of Long-term Debt    
Line of credit facility, maximum borrowing capacity $ 50,000,000  
Minimum | Note Payable, 6.24% | Subsidiaries    
Debt Instrument    
Stated interest rate 1.00%  
Maximum | Note Payable, 6.24% | Subsidiaries    
Debt Instrument    
Stated interest rate 6.24%