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FAIR VALUE - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial Assets:
Securities available for sale	$ 761,531	$ 554,611
Recurring
Financial Assets:
Securities available for sale	761,531	554,611
Equity investments, at fair value	2,290	1,880
Derivative Asset	9,948	14,345
Financial Liabilities:
Derivative Liabilities	10,310	14,702
Non-recurring | Other real estate owned:
Other real estate owned:
Total other real estate owned, net	171	237
Non-recurring | Other real estate owned: | Commercial mortgages, other
Other real estate owned:
Total other real estate owned, net		111
Non-recurring | Residential mortgages | Other real estate owned:
Other real estate owned:
Total other real estate owned, net	124	126
Non-recurring | Consumer loans: | Other real estate owned: | Home equity lines and loans
Other real estate owned:
Total other real estate owned, net	47
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring
Financial Assets:
Securities available for sale	40,337	0
Equity investments, at fair value	2,290	1,880
Derivative Asset	0	0
Financial Liabilities:
Derivative Liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-recurring | Other real estate owned:
Other real estate owned:
Total other real estate owned, net	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-recurring | Other real estate owned: | Commercial mortgages, other
Other real estate owned:
Total other real estate owned, net		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-recurring | Residential mortgages | Other real estate owned:
Other real estate owned:
Total other real estate owned, net	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-recurring | Consumer loans: | Other real estate owned: | Home equity lines and loans
Other real estate owned:
Total other real estate owned, net	0
Significant Other Observable Inputs (Level 2) | Recurring
Financial Assets:
Securities available for sale	721,194	554,611
Equity investments, at fair value	0	0
Derivative Asset	9,948	14,345
Financial Liabilities:
Derivative Liabilities	10,310	14,702
Significant Other Observable Inputs (Level 2) | Non-recurring | Other real estate owned:
Other real estate owned:
Total other real estate owned, net	0	0
Significant Other Observable Inputs (Level 2) | Non-recurring | Other real estate owned: | Commercial mortgages, other
Other real estate owned:
Total other real estate owned, net		0
Significant Other Observable Inputs (Level 2) | Non-recurring | Residential mortgages | Other real estate owned:
Other real estate owned:
Total other real estate owned, net	0	0
Significant Other Observable Inputs (Level 2) | Non-recurring | Consumer loans: | Other real estate owned: | Home equity lines and loans
Other real estate owned:
Total other real estate owned, net	0
Significant Unobservable Inputs (Level 3) | Recurring
Financial Assets:
Securities available for sale	0	0
Equity investments, at fair value	0	0
Derivative Asset	0	0
Financial Liabilities:
Derivative Liabilities	0	0
Significant Unobservable Inputs (Level 3) | Non-recurring | Other real estate owned:
Other real estate owned:
Total other real estate owned, net	171	237
Significant Unobservable Inputs (Level 3) | Non-recurring | Other real estate owned: | Commercial mortgages, other
Other real estate owned:
Total other real estate owned, net		111
Significant Unobservable Inputs (Level 3) | Non-recurring | Residential mortgages | Other real estate owned:
Other real estate owned:
Total other real estate owned, net	124	126
Significant Unobservable Inputs (Level 3) | Non-recurring | Consumer loans: | Other real estate owned: | Home equity lines and loans
Other real estate owned:
Total other real estate owned, net	47
U.S. Treasury notes and bonds | Recurring
Financial Assets:
Securities available for sale	40,337
U.S. Treasury notes and bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring
Financial Assets:
Securities available for sale	40,337
U.S. Treasury notes and bonds | Significant Other Observable Inputs (Level 2) | Recurring
Financial Assets:
Securities available for sale	0
U.S. Treasury notes and bonds | Significant Unobservable Inputs (Level 3) | Recurring
Financial Assets:
Securities available for sale	0
Mortgage-backed securities, residential
Financial Assets:
Securities available for sale	586,126	467,866
Mortgage-backed securities, residential | Recurring
Financial Assets:
Securities available for sale	586,126	467,866
Mortgage-backed securities, residential | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring
Financial Assets:
Securities available for sale	0	0
Mortgage-backed securities, residential | Significant Other Observable Inputs (Level 2) | Recurring
Financial Assets:
Securities available for sale	586,126	467,866
Mortgage-backed securities, residential | Significant Unobservable Inputs (Level 3) | Recurring
Financial Assets:
Securities available for sale	0	0
Obligations of states and political subdivisions
Financial Assets:
Securities available for sale	42,352	43,405
Obligations of states and political subdivisions | Recurring
Financial Assets:
Securities available for sale	42,352	43,405
Obligations of states and political subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring
Financial Assets:
Securities available for sale	0	0
Obligations of states and political subdivisions | Significant Other Observable Inputs (Level 2) | Recurring
Financial Assets:
Securities available for sale	42,352	43,405
Obligations of states and political subdivisions | Significant Unobservable Inputs (Level 3) | Recurring
Financial Assets:
Securities available for sale	0	0
Corporate bonds and notes
Financial Assets:
Securities available for sale	17,061	9,035
Corporate bonds and notes | Recurring
Financial Assets:
Securities available for sale	17,061	9,035
Corporate bonds and notes | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring
Financial Assets:
Securities available for sale	0	0
Corporate bonds and notes | Significant Other Observable Inputs (Level 2) | Recurring
Financial Assets:
Securities available for sale	17,061	9,035
Corporate bonds and notes | Significant Unobservable Inputs (Level 3) | Recurring
Financial Assets:
Securities available for sale	0	0
SBA loan pools
Financial Assets:
Securities available for sale	75,655	34,305
SBA loan pools | Recurring
Financial Assets:
Securities available for sale	75,655	34,305
SBA loan pools | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring
Financial Assets:
Securities available for sale	0	0
SBA loan pools | Significant Other Observable Inputs (Level 2) | Recurring
Financial Assets:
Securities available for sale	75,655	34,305
SBA loan pools | Significant Unobservable Inputs (Level 3) | Recurring
Financial Assets:
Securities available for sale	$ 0	$ 0

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