XML 47 R34.htm IDEA: XBRL DOCUMENT
v3.21.1

Investment Securities (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2021
Investment Securities |
Schedule of amortized cost and fair value of investment securities held to maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross |  | Gross | ​ | ​ | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
(Dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value |
March 31, 2021: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 49,988 | ​ | $ | — | ​ | $ | (1,919) | ​ | $ | 48,069 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 749,291 | ​ | ​ | — | ​ | ​ | (19,340) | ​ | ​ | 729,951 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 99,326 | ​ | ​ | — | ​ | ​ | (4,627) | ​ | ​ | 94,699 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 250,708 | ​ | ​ | 44 | ​ | ​ | (5,878) | ​ | ​ | 244,874 | ​
Small Business Administration loan-backed securities | ​ | ​ | 65,000 | ​ | ​ | — | ​ | ​ | (1,831) | ​ | ​ | 63,169 | ​
​ | ​ | $ | 1,214,313 | ​ | $ | 44 | ​ | $ | (33,595) | ​ | $ | 1,180,762 | ​
December 31, 2020: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 25,000 | ​ | $ | 1 | ​ | $ | — | ​ | $ | 25,001 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 632,269 | ​ | ​ | 1,827 | ​ | ​ | (1,032) | ​ | ​ | 633,064 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 75,767 | ​ | ​ | 405 | ​ | ​ | — | ​ | ​ | 76,172 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 174,506 | ​ | ​ | 300 | ​ | ​ | (91) | ​ | ​ | 174,715 | ​
Small Business Administration loan-backed securities | ​ | ​ | 48,000 | ​ | ​ | 231 | ​ | ​ | — | ​ | ​ | 48,231 | ​
​ | ​ | $ | 955,542 | ​ | $ | 2,764 | ​ | $ | (1,123) | ​ | $ | 957,183 | ​
Schedule of amortized cost and fair value of investment securities available for sale | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
(Dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value |
March 31, 2021: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 25,000 | ​ | $ | — | ​ | $ | (1,447) | ​ | $ | 23,553 | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ |  | 1,560,744 | ​ |  | 9,607 | ​ |  | (21,669) | ​ |  | 1,548,682 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 682,412 | ​ | ​ | 14,441 | ​ | ​ | (6,303) | ​ | ​ | 690,550 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 581,776 | ​ | ​ | 7,021 | ​ | ​ | (8,418) | ​ | ​ | 580,379 | ​
State and municipal obligations | ​ |  | 589,954 | ​ |  | 10,510 | ​ |  | (4,361) | ​ |  | 596,103 | ​
Small Business Administration loan-backed securities | ​ |  | 439,210 | ​ |  | 2,741 | ​ |  | (3,414) | ​ |  | 438,537 | ​
Corporate securities | ​ | ​ | 13,549 | ​ | ​ | 170 | ​ | ​ | (33) | ​ | ​ | 13,686 | ​
​ | ​ | $ | 3,892,645 | ​ | $ | 44,490 | ​ | $ | (45,645) | ​ | $ | 3,891,490 | ​
December 31, 2020: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 29,882 | ​ | $ | 16 | ​ | $ | (642) | ​ | $ | 29,256 | ​
Residential mortgage-backed securities issued by U.S. government | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,351,506 | ​ | ​ | 16,657 | ​ | ​ | (1,031) | ​ | ​ | 1,367,132 | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 739,797 | ​ | ​ | 16,579 | ​ | ​ | (825) | ​ | ​ | 755,551 | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 229,219 | ​ | ​ | 10,939 | ​ | ​ | (50) | ​ | ​ | 240,108 | ​
State and municipal obligations | ​ | ​ | 502,575 | ​ | ​ | 17,491 | ​ | ​ | (27) | ​ | ​ | 520,039 | ​
Small Business Administration loan-backed securities | ​ |  | 401,496 | ​ |  | 4,978 | ​ |  | (1,590) | ​ |  | 404,884 | ​
Corporate securities | ​ |  | 13,562 | ​ |  | 140 | ​ |  | — | ​ |  | 13,702 | ​
​ | ​ | $ | 3,268,037 | ​ | $ | 66,800 | ​ | $ | (4,165) | ​ | $ | 3,330,672 | ​
Schedule of amortized cost and carrying value of other investment securities | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Carrying |
(Dollars in thousands) |  | Value |
March 31, 2021: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 16,283 | ​
Federal Reserve Bank stock | ​ | ​ | 129,716 | ​
Investment in unconsolidated subsidiaries | ​ |  | 4,941 | ​
Other nonmarketable investment securities | ​ |  | 10,528 | ​
​ | ​ | $ | 161,468 | ​
December 31, 2020: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 15,083 | ​
Federal Reserve Bank stock | ​ | ​ | 129,871 | ​
Investment in unconsolidated subsidiaries | ​ |  | 4,941 | ​
Other nonmarketable investment securities | ​ |  | 10,548 | ​
​ | ​ | $ | 160,443 | ​
Schedule of amortized cost and fair value of debt and equity securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Securities | ​ | Securities |
​ | ​ | Held to Maturity | ​ | Available for Sale |
​ | ​ | Amortized | ​ | Fair | ​ | Amortized | ​ | Fair |
(Dollars in thousands) |  | Cost |  | Value |  | Cost |  | Value |
Due in one year or less |  | $ | — | ​ | $ | — |  | $ | 6,546 |  | $ | 6,581 | ​
Due after one year through five years | ​ |  | — | ​ |  | — | ​ |  | 90,961 | ​ |  | 93,481 | ​
Due after five years through ten years | ​ |  | 103,666 | ​ |  | 99,660 | ​ |  | 556,874 | ​ |  | 561,777 | ​
Due after ten years | ​ |  | 1,110,647 | ​ |  | 1,081,102 | ​ |  | 3,238,264 | ​ |  | 3,229,651 | ​
​ | ​ | $ | 1,214,313 | ​ | $ | 1,180,762 | ​ | $ | 3,892,645 | ​ | $ | 3,891,490 | ​
Schedule of securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than | ​ | Twelve Months |
​ | ​ | Twelve Months | ​ | or More |
​ | ​ | Gross | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ |
​ | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair |
(Dollars in thousands) |  | Losses |  | Value |  | Losses |  | Value |
March 31, 2021: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held to Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 1,919 | ​ | $ | 48,069 | ​ | $ | — | ​ | $ | — | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 19,340 | ​ | ​ | 729,951 | ​ | ​ | — | ​ | ​ | — | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 4,627 | ​ | ​ | 94,699 | ​ | ​ | — | ​ | ​ | — | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 5,878 | ​ | ​ | 141,438 | ​ | ​ | — | ​ | ​ | — | ​
Small Business Administration loan-backed securities | ​ | ​ | 1,831 | ​ | ​ | 63,169 | ​ | ​ | — | ​ | ​ | — | ​
​ | ​ | $ | 33,595 | ​ | $ | 1,077,326 | ​ | $ | — | ​ | $ | — | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 1,447 | ​ | $ | 23,553 | ​ | $ | — | ​ | $ | — | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 21,669 | ​ | ​ | 987,348 | ​ | ​ | — | ​ | ​ | — | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 6,303 | ​ |  | 140,650 | ​ |  | — | ​ |  | — | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ |  | 8,418 | ​ | ​ | 271,699 | ​ | ​ | — | ​ | ​ | — | ​
State and municipal obligations | ​ |  | 4,361 | ​ | ​ | 153,477 | ​ | ​ | — | ​ | ​ | — | ​
Small Business Administration loan-backed securities | ​ |  | 2,225 | ​ | ​ | 136,824 | ​ | ​ | 1,189 | ​ | ​ | 123,335 | ​
Corporate securities | ​ | ​ | 33 | ​ | ​ | 6,967 | ​ | ​ | — | ​ | ​ | — | ​
​ | ​ | $ | 44,456 | ​ | $ | 1,720,518 | ​ | $ | 1,189 | ​ | $ | 123,335 | ​
December 31, 2020: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held to Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | $ | 1,032 | ​ | $ | 213,146 | ​ | $ | — | ​ | $ | — | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 91 | ​ | ​ | 27,445 | ​ | ​ | — | ​ | ​ | — | ​
​ | ​ | $ | 1,123 | ​ | $ | 240,591 | ​ | $ | — | ​ | $ | — | ​
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 642 | ​ | $ | 24,358 | ​ | $ | — | ​ | $ | — | ​
Residential mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 1,031 | ​ | ​ | 260,411 | ​ | ​ | — | ​ | ​ | — | ​
Residential collateralized mortgage-obligations issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 825 | ​ |  | 140,333 | ​ |  | — | ​ |  | — | ​
Commercial mortgage-backed securities issued by U.S. government | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
agencies or sponsored enterprises | ​ | ​ | 46 | ​ | ​ | 13,594 | ​ | ​ | 4 | ​ | ​ | 871 | ​
State and municipal obligations | ​ | ​ | 27 | ​ | ​ | 8,620 | ​ | ​ | — | ​ | ​ | — | ​
Small Business Administration loan-backed securities | ​ | ​ | 573 | ​ | ​ | 94,981 | ​ | ​ | 1,017 | ​ | ​ | 104,254 | ​
​ | ​ | $ | 3,144 | ​ | $ | 542,297 | ​ | $ | 1,021 | ​ | $ | 105,125 | ​

X
- References No definition available. + Details
Name: | ssb_InvestmentSecuritiesDisclosureAbstract
Namespace Prefix: | ssb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of other investment securities from cost basis to fair value. + References No definition available. + Details
Name: | ssb_ScheduleOfOtherInvestmentSecuritiesReconciliationTableTextBlock
Namespace Prefix: | ssb_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5B -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269825-111563 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 + Details
Name: | us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration