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BORROWINGS (Narrative) (Details) - USD ($) $ in Thousands |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 29, 2019 | Feb. 01, 2019 | Aug. 23, 2012 | Sep. 30, 2020 | Dec. 31, 2019
Subordinated Borrowing [Line Items] |  |  |  |  |
Remaining available balance for the federal funds lines |  |  |  | $ 942,000 | $ 682,000
Maximum collateral dependent line of credit with the FHLB |  |  |  | 5,900,000 | 5,200,000
Remaining fair value discount on acquired notes |  |  |  | 1,200 |
Prepayment penalty | $ 7,400 |  | $ 19,600 |  |
Remaining borrowing capacity |  |  |  | 25,000 | 25,000
Trust Preferred Capital Notes |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Remaining fair value discount on acquired notes |  |  |  | 14,300 |
Long-term debt borrowings |  |  |  | 155,159 |
Subordinated Debt |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Remaining fair value discount on acquired notes |  |  |  |  | $ 1,400
Long-term debt borrowings |  |  |  | 158,500 |
PPPLF Advances |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Long-term debt borrowings |  |  |  | 189,945 |
Remaining borrowing capacity |  |  |  | 1,400,000 |
StellarOne Bank and Xenith [Member] | Trust Preferred Capital Notes |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Trust preferred capital notes principal balance |  |  |  | 58,500 |
Trust preferred securities acquired |  |  |  | $ 87,000 |
Access National Bank |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Trust preferred capital notes principal balance |  | $ 5,000 |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition The cash inflow from issuance of preferred stocks by a business trust or other special purpose entity, mainly established by a bank holding entity, to third party investors. The trust's assets are deeply subordinated debentures of the bank holding entity. Most trust preferred securities are subject to a mandatory redemption upon the repayment of the debentures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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