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Mergers and Acquisitions- Park & SBFC (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 30, 2017 | Jan. 03, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2018
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |
Federal funds purchased and securities sold under agreements to repurchase |  |  |  | $ 298,741,000 |  |  | $ 270,649,000
Goodwill |  |  | $ 999,586,000 | 1,002,900,000 | $ 999,586,000 | $ 999,586,000 | 1,002,900,000
Consideration: |  |  |  |  |  |  |
SSB common stock issued ($688,566) and cash exchanged for fractional shares ($88) | $ 68,700,000 |  |  |  |  |  |
Additional information |  |  |  |  |  |  |
Provisional income tax expense |  |  |  | $ 26,600,000 |  | 26,600,000 |
Proforma amounts |  |  |  |  |  |  |
Total revenues (net interest income plus noninterest income), Pro Forma |  |  | 14,052,000 |  |  | 690,716,000 |
Net operating income available to the common shareholder, Pro Forma |  |  | 4,829,000 |  |  | 146,821,000 |
Park Sterling Corporation |  |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |  |
Cash and cash equivalents | 116,454,000 |  |  |  |  |  |
Investment securities | 462,924,000 |  |  |  |  |  |
Loans held for sale | 70,882,000 |  |  |  |  |  |
Loans, net of allowance and mark | 2,241,326,000 |  |  |  |  |  |
Premises and equipment | 55,790,000 |  |  |  |  |  |
Intangible assets | 29,496,000 |  |  |  |  |  |
OREO and repossessed assets | 2,330,000 |  |  |  |  |  |
Bank owned life insurance | 72,703,000 |  |  |  |  |  |
Deferred tax asset. | 31,682,000 |  |  |  |  |  |
Other assets | 21,119,000 |  |  |  |  |  |
Total assets | 3,104,706,000 |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |
Noninterest-bearing | 561,874,000 |  |  |  |  |  |
Interest-bearing | 1,888,890,000 |  |  |  |  |  |
Total deposits | 2,450,764,000 |  |  |  |  |  |
Other borrowings | 340,938,000 |  |  |  |  |  |
Other liabilities | 26,310,000 |  |  |  |  |  |
Total liabilities | 2,818,012,000 |  |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed | 286,694,000 |  |  |  |  |  |
Goodwill | 406,265,000 |  |  |  |  |  |
Net assets acquired over liabilities assumed | $ 692,959,000 |  |  |  |  |  |
Consideration: |  |  |  |  |  |  |
Common stock shares outstanding | 7,480,343 |  |  |  |  |  |
Purchase price per share of the SSB's common stock | $ 92.05 |  |  |  |  |  |
SSB common stock issued ($688,566) and cash exchanged for fractional shares ($88) | $ 688,654,000 |  |  |  |  |  |
Common stock issued | 688,566,000 |  |  |  |  |  |
Price per fractional share | 88 |  |  |  |  |  |
Cash paid for stock options outstanding | 4,305,000 |  |  |  |  |  |
Fair value of total consideration transferred | 692,959,000 |  |  |  |  |  |
Additional information |  |  |  |  |  |  |
Allowance for loan losses | 12,500,000 |  |  |  |  |  |
Fair value mark on loans | $ 21,300,000 |  |  |  |  |  |
Interest rate on core deposit intangibles (in %) | 1.66% |  |  |  |  |  |
Goodwill write-off | $ 73,100,000 |  |  |  |  |  |
Premium for fixed maturity time deposits | 2,300,000 |  |  |  |  |  |
Fair value mark on fixed maturity time deposits | 253,000 |  |  |  |  |  |
Fair value adjustment on Trust Preferred Securities | 2,400,000 |  |  |  |  |  |
Discount on trust preferred securities | 14,000,000.0 |  |  |  |  |  |
Fair value adjustments to employee benefit plans | 1,500,000 |  |  |  |  |  |
Merger-related costs |  |  | 44,500,000 |  | 44,500,000 | 44,500,000 | $ 28,600,000
Proforma amounts |  |  |  |  |  |  |
Total revenues (net interest income plus noninterest income), Pro Forma |  |  |  |  | 67,823,000 |  |
Net operating income available to the common shareholder, Pro Forma |  |  |  |  | 25,790,000 |  |
Park Sterling Corporation | As previously recorded by acquiree |  |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |  |
Cash and cash equivalents | 116,454,000 |  |  |  |  |  |
Investment securities | 461,261,000 |  |  |  |  |  |
Loans held for sale | 2,200,000 |  |  |  |  |  |
Loans, net of allowance and mark | 2,346,612,000 |  |  |  |  |  |
Premises and equipment | 61,059,000 |  |  |  |  |  |
Intangible assets | 73,090,000 |  |  |  |  |  |
OREO and repossessed assets | 2,549,000 |  |  |  |  |  |
Bank owned life insurance | 72,703,000 |  |  |  |  |  |
Deferred tax asset. | 17,963,000 |  |  |  |  |  |
Other assets | 21,595,000 |  |  |  |  |  |
Total assets | 3,175,486,000 |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |
Noninterest-bearing | 561,874,000 |  |  |  |  |  |
Interest-bearing | 1,886,810,000 |  |  |  |  |  |
Total deposits | 2,448,684,000 |  |  |  |  |  |
Other borrowings | 329,249,000 |  |  |  |  |  |
Other liabilities | 24,179,000 |  |  |  |  |  |
Total liabilities | 2,802,112,000 |  |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed | 373,374,000 |  |  |  |  |  |
Net assets acquired over liabilities assumed | 373,374,000 |  |  |  |  |  |
Park Sterling Corporation | Adjustments |  |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |  |
Investment securities | 1,444,000 |  |  |  |  |  |
Loans held for sale | 68,686,000 |  |  |  |  |  |
Loans, net of allowance and mark | (95,878,000) |  |  |  |  |  |
Premises and equipment | (4,882,000) |  |  |  |  |  |
Intangible assets | (46,915,000) |  |  |  |  |  |
OREO and repossessed assets | (429,000) |  |  |  |  |  |
Deferred tax asset. | 11,596,000 |  |  |  |  |  |
Other assets | (476,000) |  |  |  |  |  |
Total assets | (66,854,000) |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |
Interest-bearing | 2,692,000 |  |  |  |  |  |
Total deposits | 2,692,000 |  |  |  |  |  |
Other borrowings | 11,689,000 |  |  |  |  |  |
Other liabilities | 2,131,000 |  |  |  |  |  |
Total liabilities | 16,512,000 |  |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed | (83,366,000) |  |  |  |  |  |
Goodwill | 402,951,000 |  |  |  |  |  |
Net assets acquired over liabilities assumed | 319,585,000 |  |  |  |  |  |
Additional information |  |  |  |  |  |  |
Adjustment to acquired loans portfolio | 70,400,000 |  |  |  |  |  |
Park Sterling Corporation | Subsequent Fair Value Adjustments |  |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |  |
Investment securities | 219,000 |  |  |  |  |  |
Loans held for sale | (4,000) |  |  |  |  |  |
Loans, net of allowance and mark | (9,408,000) |  |  |  |  |  |
Premises and equipment | (387,000) |  |  |  |  |  |
Intangible assets | 3,321,000 |  |  |  |  |  |
OREO and repossessed assets | 210,000 |  |  |  |  |  |
Deferred tax asset. | 2,123,000 |  |  |  |  |  |
Total assets | (3,926,000) |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |
Interest-bearing | (612,000) |  |  |  |  |  |
Total deposits | (612,000) |  |  |  |  |  |
Total liabilities | (612,000) |  |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed | (3,314,000) |  |  |  |  |  |
Goodwill | $ 3,314,000 |  |  |  |  |  |
Southeastern Bank Financial |  |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 72,043,000 |  |  |  |  |
Investment securities |  | 590,054,000 |  |  |  |  |
Loans held for sale |  | 13,652,000 |  |  |  |  |
Loans, net of allowance and mark |  | 1,049,950,000 |  |  |  |  |
Premises and equipment |  | 24,077,000 |  |  |  |  |
Intangible assets |  | 18,120,000 |  |  |  |  |
OREO and repossessed assets |  | 450,000 |  |  |  |  |
Bank owned life insurance |  | 44,513,000 |  |  |  |  |
Deferred tax asset. |  | 16,075,000 |  |  |  |  |
Other assets |  | 7,063,000 |  |  |  |  |
Total assets |  | 1,835,997,000 |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |
Noninterest-bearing |  | 262,967,000 |  |  |  |  |
Interest-bearing |  | 1,257,953,000 |  |  |  |  |
Total deposits |  | 1,520,920,000 |  |  |  |  |
Federal funds purchased and securities sold under agreements to repurchase |  | 1,014,000 |  |  |  |  |
Other borrowings |  | 109,500,000 |  |  |  |  |
Other liabilities |  | 27,743,000 |  |  |  |  |
Total liabilities |  | 1,659,177,000 |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed |  | 176,820,000 |  |  |  |  |
Goodwill |  | 258,295,000 |  |  |  |  |
Net assets acquired over liabilities assumed |  | $ 435,115,000 |  |  |  |  |
Consideration: |  |  |  |  |  |  |
Common stock shares outstanding |  | 4,978,338 |  |  |  |  |
Purchase price per share of the SSB's common stock |  | $ 87.30 |  |  |  |  |
SSB common stock issued ($688,566) and cash exchanged for fractional shares ($88) |  | $ 434,625,000 |  |  |  |  |
Common stock issued |  | 434,609 |  |  |  |  |
Price per fractional share |  | 16 |  |  |  |  |
Cash paid for stock options outstanding |  | 490,000 |  |  |  |  |
Fair value of total consideration transferred |  | 435,115,000 |  |  |  |  |
Additional information |  |  |  |  |  |  |
Adjustment to acquired loans portfolio |  | 30,700,000 |  |  |  |  |
Allowance for loan losses |  | 20,100,000 |  |  |  |  |
Discount on trust preferred securities |  | 2,100,000 |  |  |  |  |
Federal Home Loan Bank, Advances, Premium |  | 1,000,000.0 |  |  |  |  |
Fair value adjustments to employee benefit plans |  | 8,300,000 |  |  |  |  |
Provision for loan losses |  |  |  |  |  | 325,000 |
Southeastern Bank Financial | As previously recorded by acquiree |  |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |  |
Cash and cash equivalents |  | 72,043,000 |  |  |  |  |
Investment securities |  | 591,824,000 |  |  |  |  |
Loans held for sale |  | 13,652,000 |  |  |  |  |
Loans, net of allowance and mark |  | 1,060,618,000 |  |  |  |  |
Premises and equipment |  | 25,419,000 |  |  |  |  |
Intangible assets |  | 140,000 |  |  |  |  |
OREO and repossessed assets |  | 580,000 |  |  |  |  |
Bank owned life insurance |  | 44,513,000 |  |  |  |  |
Deferred tax asset. |  | 16,247,000 |  |  |  |  |
Other assets |  | 7,545,000 |  |  |  |  |
Total assets |  | 1,832,581,000 |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |
Noninterest-bearing |  | 262,967,000 |  |  |  |  |
Interest-bearing |  | 1,257,953,000 |  |  |  |  |
Total deposits |  | 1,520,920,000 |  |  |  |  |
Federal funds purchased and securities sold under agreements to repurchase |  | 1,014,000 |  |  |  |  |
Other borrowings |  | 110,620,000 |  |  |  |  |
Other liabilities |  | 19,980,000 |  |  |  |  |
Total liabilities |  | 1,652,534,000 |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed |  | 180,047,000 |  |  |  |  |
Net assets acquired over liabilities assumed |  | 180,047,000 |  |  |  |  |
Southeastern Bank Financial | Adjustments |  |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |  |
Investment securities |  | (1,770,000) |  |  |  |  |
Loans, net of allowance and mark |  | (10,668,000) |  |  |  |  |
Premises and equipment |  | (2,212,000) |  |  |  |  |
Intangible assets |  | 17,980,000 |  |  |  |  |
OREO and repossessed assets |  | (30,000) |  |  |  |  |
Deferred tax asset. |  | (687,000) |  |  |  |  |
Other assets |  | (482,000) |  |  |  |  |
Total assets |  | 2,131,000 |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |
Other borrowings |  | (1,120,000) |  |  |  |  |
Other liabilities |  | 5,553,000 |  |  |  |  |
Total liabilities |  | 4,433,000 |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed |  | (2,302,000) |  |  |  |  |
Goodwill |  | 257,370,000 |  |  |  |  |
Net assets acquired over liabilities assumed |  | 255,068,000 |  |  |  |  |
Southeastern Bank Financial | Subsequent Fair Value Adjustments |  |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |  |
Premises and equipment |  | 870,000 |  |  |  |  |
OREO and repossessed assets |  | (100,000) |  |  |  |  |
Deferred tax asset. |  | 515,000 |  |  |  |  |
Total assets |  | 1,285,000 |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |
Other liabilities |  | 2,210,000 |  |  |  |  |
Total liabilities |  | 2,210,000 |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed |  | (925,000) |  |  |  |  |
Goodwill |  | 925,000 |  |  |  |  |
Southeastern Bank Financial Corporation And Park Sterling Corporation |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |
Adjustment of other miscellaneous liabilities |  | $ 496,000 |  |  |  |  |
Merger-related costs |  |  | $ 50,000,000.0 |  | $ 50,000,000.0 | $ 50,000,000.0 |

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