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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently Adopted and New Accounting Pronouncements (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2018
Recently Adopted Accounting Pronouncements [Abstract] |  |  |
Retained earnings | $ 882,851 | $ 960,183 |
Allowance for loan losses | 49,911 | 60,869 | $ 49,284
Loans | 6,890,543 | 7,415,952 |
ASU 2016-13 [Member] |  |  |
Recently Adopted Accounting Pronouncements [Abstract] |  |  |
Allowance for loan losses | 51,268 | 60,869 |
ASU 2016-13 [Member] | Cumulative Effect Adjustment [Member] |  |  |
Recently Adopted Accounting Pronouncements [Abstract] |  |  |
Retained earnings |  | 1,100 |
Allowance for loan losses | (1,357) | (3,100) |
Other liabilities |  | 1,400 |
Increase in other operating liabilities |  | $ 600 |
Addition to allowance for credit losses | $ 3,100 |  |

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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