Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financial Assets
Securities available for sale	$ 424,252	$ 402,190
Equity securities	7,222	7,130
Loan yield maintenance provisions	1,805	767
Fair Value, Measurements, Recurring
Financial Assets
Total investment securities	431,474	409,320
Loan yield maintenance provisions	1,805	767
Corporate bonds
Financial Assets
Securities available for sale	1,432	1,188
Corporate bonds | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	1,432	1,188
Collateralized mortgage obligations | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	20,649	21,072
Small Business Administration
Financial Assets
Securities available for sale	11,222	11,930
Small Business Administration | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	11,222	11,930
Other investments measured at net asset value | Fair Value, Measurements, Recurring
Financial Assets
Equity securities	6,663	6,635
U.S. Treasury and U.S. government sponsored entities
Financial Assets
Securities available for sale	5,882	6,009
U.S. Treasury and U.S. government sponsored entities | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	5,882	6,009
State and political subdivisions
Financial Assets
Securities available for sale	231,318	211,944
State and political subdivisions | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	231,318	211,944
Mortgage-backed securities - residential
Financial Assets
Securities available for sale	153,749	150,047
Mortgage-backed securities - residential | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	153,749	150,047
Equity securities at fair value | Fair Value, Measurements, Recurring
Financial Assets
Equity securities	559	495
Interest rate swaps | Fair Value, Measurements, Recurring
Financial Liabilities
Derivative liabilities	1,805	767
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Financial Assets
Total investment securities	559	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	559	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	424,246	402,184
Loan yield maintenance provisions	1,805	767
Significant Other Observable Inputs (Level 2) | Corporate bonds | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	1,432	1,188
Significant Other Observable Inputs (Level 2) | Collateralized mortgage obligations | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	20,649	21,072
Significant Other Observable Inputs (Level 2) | Small Business Administration | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	11,222	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	5,882	6,009
Significant Other Observable Inputs (Level 2) | State and political subdivisions | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	231,318	211,944
Significant Other Observable Inputs (Level 2) | Mortgage-backed securities - residential | Fair Value, Measurements, Recurring
Financial Assets
Securities available for sale	153,743	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	1,805	767
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Financial Assets
Total investment securities	6	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	6	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