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DEPOSITS - Scheduled maturities of time certificates of deposit (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CD maturities            
Certificates of deposit maturities $ 2,167us-gaap_TimeDepositsNoncurrent
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember
$ 10,127us-gaap_TimeDepositsNoncurrent
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember
$ 9,455us-gaap_TimeDepositsNoncurrent
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember
$ 11,536us-gaap_TimeDepositsNoncurrent
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember
$ 31,845us-gaap_TimeDepositsNoncurrent
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember
$ 76,080us-gaap_TimeDepositsNoncurrent
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember
Total            
Certificates of deposit maturities $ 141,210us-gaap_TimeDepositsNoncurrent
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= SAL_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsTotalMember