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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Narrative (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
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Apr. 30, 2021 USD ($) | Feb. 28, 2021 USD ($) | Dec. 31, 2021 USD ($) investment method $ / shares | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) segment investment method $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) shares | Aug. 31, 2021 | Jul. 31, 2021 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Number of equity method investments | investment |  |  | 3 |  | 3 |  |  |  |
Period past due for loans to be considered as delinquent |  |  |  |  | 90 days |  |  |  |
Total valuation methods used on impaired loans | method |  |  | 3 |  | 3 |  |  |  |
Total loans serviced for others |  |  | $ 2,800,000 |  | $ 2,800,000 | $ 2,900,000 |  |  |
Other real estate |  |  | 2,300,000 |  | 2,300,000 | 5,700,000 |  |  |
Marketing expense |  |  |  |  | 525,000 | $ 1,096,000 | $ 1,290,000 |  |
Deferred income tax valuation allowance |  |  | 0 |  | 0 |  |  |  |
Liability for uncertain tax positions |  |  | 0 |  | 0 |  |  |  |
Unrecognized tax benefits |  |  | 0 |  | $ 0 |  |  |  |
Number of reportable segments | segment |  |  |  |  | 3 |  |  |  |
Interchecks |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  | 16.90% |
Disposal group, disposed of by sale |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Deposits assumed |  |  |  |  |  |  |  |  | $ 163,300,000
Loans of branches held for sale |  |  |  |  |  |  |  |  | $ 57,800,000
Gain on sale of banking centers |  |  | 10,800,000 | $ 10,800,000 |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Antidilutive securities (in shares) | shares |  |  |  |  | 0.3 | 0.5 | 0.4 |  |
Software |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  | 3 years |  |  |  |
Minimum | Building |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  | 7 years |  |  |  |
Minimum | Furniture, Fixtures And Equipment |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  | 3 years |  |  |  |
Maximum | Building |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  | 40 years |  |  |  |
Maximum | Furniture, Fixtures And Equipment |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  | 10 years |  |  |  |
Subsidiary bank |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
FHLB stock |  |  | $ 1,800,000 |  | $ 1,800,000 | $ 2,800,000 |  |  |
FHLB stock par value (in dollars per share) | $ / shares |  |  | $ 100 |  | $ 100 | $ 100 |  |  |
Flexia |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Payments for software |  | $ 1,000,000.0 |  |  |  |  |  |  |
Flexia |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest |  | 80.00% |  |  |  |  |  |  |
Purchase consideration |  | $ 2,500,000 |  |  |  |  |  |  |
Trabian |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest | 80.00% |  |  |  |  |  |  |  |
Purchase consideration | $ 1,600,000 |  |  |  |  |  |  |  |

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