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Summary of Significant Accounting Policies - Impact of Adoption (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]      
Debt securities, available-for-sale, allowance for credit loss $ 897    
Allowance for credit losses, loans and lease 68,216 $ 35,331  
Reserve for unfunded commitments   420  
Cumulative Effect, Period Of Adoption, Adjustment      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   12,922  
Reserve for unfunded commitments   1,145  
Cumulative Effect, Period Of Adoption, Adjusted Balance      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   48,253  
Reserve for unfunded commitments   1,565  
Commercial Financial And Agricultural [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   8,759  
Commercial Financial And Agricultural [Member] | Cumulative Effect, Period Of Adoption, Adjustment      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   5,284  
Commercial Financial And Agricultural [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   14,043  
Real-Estate Commercial [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   15,750  
Real-Estate Commercial [Member] | Cumulative Effect, Period Of Adoption, Adjustment      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   6,208  
Real-Estate Commercial [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   21,958  
Real-Estate Construction [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   2,446  
Real-Estate Construction [Member] | Cumulative Effect, Period Of Adoption, Adjustment      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   29  
Real-Estate Construction [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   2,475  
Real Estate Residential Secured For Business Purpose [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   2,622  
Real Estate Residential Secured For Business Purpose [Member] | Cumulative Effect, Period Of Adoption, Adjustment      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   2,502  
Real Estate Residential Secured For Business Purpose [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   5,124  
Real Estate Residential Secured For Personal Purpose [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   2,713  
Real Estate Residential Secured For Personal Purpose [Member] | Cumulative Effect, Period Of Adoption, Adjustment      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   (706)  
Real Estate Residential Secured For Personal Purpose [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   2,007  
Real Estate Home Equity Secured For Personal Purpose [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   1,076  
Real Estate Home Equity Secured For Personal Purpose [Member] | Cumulative Effect, Period Of Adoption, Adjustment      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   (364)  
Real Estate Home Equity Secured For Personal Purpose [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   712  
Loans to Individuals [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   470  
Loans to Individuals [Member] | Cumulative Effect, Period Of Adoption, Adjustment      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   104  
Loans to Individuals [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   574  
Lease Financings [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   1,311  
Lease Financings [Member] | Cumulative Effect, Period Of Adoption, Adjustment      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   (135)  
Lease Financings [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   1,176  
Unallocated [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   184  
Unallocated [Member] | Cumulative Effect, Period Of Adoption, Adjustment      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   0  
Unallocated [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit losses, loans and lease   184  
Corporate Bonds [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Debt securities, available-for-sale, allowance for credit loss $ 897 0 $ 0
Corporate Bonds [Member] | Cumulative Effect, Period Of Adoption, Adjustment      
Summary Of Significant Accounting Policies [Line Items]      
Debt securities, available-for-sale, allowance for credit loss   300  
Corporate Bonds [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance      
Summary Of Significant Accounting Policies [Line Items]      
Debt securities, available-for-sale, allowance for credit loss   $ 300