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BUSINESS COMBINATIONS - Monument Bancorp (Details)		3 Months Ended								12 Months Ended
	Apr. 01, 2019 USD ($) Office shares	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
BUSINESS COMBINATIONS
Goodwill		$ 52,505,000				$ 28,388,000				$ 52,505,000	$ 28,388,000	$ 11,942,000
Loss on prepayment of borrowings		1,636,000	$ 0	$ 0	$ 0
Net gains on available-for-sale debt securities		144,000	25,000	0	0	3,000	$ 13,000	$ 7,000	$ 0	169,000	23,000
Merger-related expenses		$ 182,000	$ 6,402,000	$ 983,000	$ 141,000	$ 281,000	$ 206,000	$ 3,301,000	$ 311,000	$ 7,708,000	4,099,000
Monument Bancorp, Inc
BUSINESS COMBINATIONS
Common stock acquired (as a percent)	100.00%
Number of bank offices | Office	2
Number of lending office | Office	1
Total purchase consideration	$ 42,700,000
Cash paid	$ 9,600,000
Consideration in shares of commons stock (in shares) | shares	1,279,825
Common equity issued in business combination	$ 33,100,000
Equity portion of business acquisition consideration issuance costs	181,000
Goodwill	16,400,000
Core deposit intangible asset	1,500,000
Loans	259,300,000
Deposits	223,300,000
Borrowings	111,600,000
Subordinated debt	12,400,000
Available-for-sale debt securities	94,600,000
Net gains on available-for-sale debt securities	$ 0
Refinement term of assets and liabilities	1 year
Merger-related expenses											$ 3,812,000
Monument Bancorp, Inc | Subordinated debt, Redeemed April 1, 2019
BUSINESS COMBINATIONS
Subordinated debt	$ 5,400,000
Loss on prepayment of borrowings	$ 0

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