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Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financial Assets
Securities available for sale	$ 432,233	$ 402,190
Equity securities	7,909	7,130
Loan yield maintenance provisions	1,898	767	$ 653
Fair Value, Measurements, Recurring
Financial Assets
Total investment securities	440,142	409,320
Loan yield maintenance provisions	1,898	767
Corporate bonds
Financial Assets
Securities available for sale	1,260	1,188
Corporate bonds | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	1,260	1,188
Collateralized mortgage obligations | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	11,347	21,072
Small Business Administration
Financial Assets
Securities available for sale	6,480	11,930
Small Business Administration | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	6,480	11,930
Other equity investments measured at net asset value | Fair Value, Measurements, Recurring
Financial Assets
Equity securities	7,315	6,635
U.S. Treasury and U.S. government sponsored entities
Financial Assets
Securities available for sale	3,811	6,009
U.S. Treasury and U.S. government sponsored entities | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	3,811	6,009
State and political subdivisions
Financial Assets
Securities available for sale	261,425	211,944
State and political subdivisions | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	261,425	211,944
Mortgage-backed securities - residential
Financial Assets
Securities available for sale	147,910	150,047
Mortgage-backed securities - residential | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	147,910	150,047
Equity securities at fair value | Fair Value, Measurements, Recurring
Financial Assets
Equity securities	594	495
Interest rate swaps | Fair Value, Measurements, Recurring
Financial Liabilities
Derivative liabilities	1,898	767
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Financial Assets
Total investment securities	594	495
Loan yield maintenance provisions	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized mortgage obligations | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Small Business Administration | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury and U.S. government sponsored entities | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | State and political subdivisions | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities - residential | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities at fair value | Fair Value, Measurements, Recurring
Financial Assets
Equity securities	594	495
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swaps | Fair Value, Measurements, Recurring
Financial Liabilities
Derivative liabilities	0	0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Financial Assets
Total investment securities	432,228	402,184
Loan yield maintenance provisions	1,898	767
Significant Other Observable Inputs (Level 2) | Corporate bonds | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	1,260	1,188
Significant Other Observable Inputs (Level 2) | Collateralized mortgage obligations | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	11,347	21,072
Significant Other Observable Inputs (Level 2) | Small Business Administration | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	6,480	11,930
Significant Other Observable Inputs (Level 2) | U.S. Treasury and U.S. government sponsored entities | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	3,811	6,009
Significant Other Observable Inputs (Level 2) | State and political subdivisions | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	261,425	211,944
Significant Other Observable Inputs (Level 2) | Mortgage-backed securities - residential | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	147,905	150,041
Significant Other Observable Inputs (Level 2) | Equity securities at fair value | Fair Value, Measurements, Recurring
Financial Assets
Equity securities	0	0
Significant Other Observable Inputs (Level 2) | Interest rate swaps | Fair Value, Measurements, Recurring
Financial Liabilities
Derivative liabilities	1,898	767
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Financial Assets
Total investment securities	5	6
Loan yield maintenance provisions	0	0
Significant Unobservable Inputs (Level 3) | Corporate bonds | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) | Collateralized mortgage obligations | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) | Small Business Administration | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) | U.S. Treasury and U.S. government sponsored entities | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) | State and political subdivisions | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) | Mortgage-backed securities - residential | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	5	6
Significant Unobservable Inputs (Level 3) | Equity securities at fair value | Fair Value, Measurements, Recurring
Financial Assets
Equity securities	0	0
Significant Unobservable Inputs (Level 3) | Interest rate swaps | Fair Value, Measurements, Recurring
Financial Liabilities
Derivative liabilities	$ 0	$ 0

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