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ACQUISITIONS (Narrative) (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Feb. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Cash paid in acquisition |  | $ 12,000 | $ 14,304,000 | $ 231,000
Merger-related costs |  | 27,824,000 | 39,728,000 | 5,393,000
Goodwill |  | 935,560,000 | 727,168,000 |
Issuance of common stock in regard to acquisitions |  | 499,974,000 | 794,809,000 | $ 0
Access National Bank |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of shares equivalent to each share of acquired entity | 0.75 |  |  |
Company's common shares issued | 15,842,026 |  |  |
Consideration transferred, fair value | $ 499,974,000 |  |  |
Cash paid in acquisition | 12,000 |  |  |
Merger-related costs |  | $ 26,200,000 | $ 1,800,000 |
Goodwill | 208,376,000 |  |  |
Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets, amortization period |  | 4 years |  |
Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets, amortization period |  | 10 years |  |
Performing | Access National Bank |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired performing loans, fair value | 2,100,000,000 |  |  |
Contractually required principal and interest payments | 2,500,000,000 |  |  |
Contractual cash flows not expected to be collected | 17,900,000 |  |  |
Nonperforming | Access National Bank |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value of loans acquired with a deterioration of credit quality | 33,307,000 |  |  |
Contractually required principal and interest payments | $ 44,429,000 |  |  |

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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