BUSINESS COMBINATIONS - Covenant Financial Pro Forma (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Covenant Financial Inc.
BUSINESS COMBINATIONS
Merger-related expenses, including Covenant's expense	$ 1,353,000
Merger-related expenses, net of tax	1,111,000
Tax benefits excluded from pro-forma realized from stock-based compensation vested	600,000
Covenant Financial Inc.
BUSINESS COMBINATIONS
Merger-related expenses, including Covenant's expense	9,061,000
Merger related expenses	7,708,000	$ 287,000
Merger-related expenses, including Covenant's expense, net of tax	7,245,000
Interest income	88,379,000	88,830,000
Interest expense	13,407,000	15,156,000
Net interest income	74,972,000	73,674,000
Provision for loan losses	4,013,000	1,309,000
Net interest income after provision for loan losses	70,959,000	72,365,000
Noninterest income.	24,657,000	20,550,000
Net gains on securities	169,000	23,000
Loss on prepayment of borrowings	1,636,000	0
Other noninterest expenses	60,094,000	62,377,000
Income before income tax provision	34,055,000	30,561,000
Income tax provision	6,227,000	5,311,000
Net income	$ 27,828,000	$ 25,250,000
Earnings per common share - basic (in dollars per share)	$ 1.75	$ 1.64
Earnings per common share - diluted (in dollars per share)	$ 1.75	$ 1.63