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LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Stated at Face Amount, Net of Unearned Income) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment, net of deferred fees and costs | $ 14,308,646 |  | $ 12,610,936
Total Allowance for credit losses | (169,977) | $ (94,838) | (42,294)
Total loans held for investment, net | 14,138,669 |  | 12,568,642
Loans, recorded investment under the Cares Act | 14,138,669 |  | 12,568,642
Construction and Land Development |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment, net of deferred fees and costs | 1,247,939 |  | 1,250,924
Commercial Real Estate - Owner Occupied |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment, net of deferred fees and costs | 2,067,087 |  | 2,041,243
Commercial Real Estate - Non-Owner Occupied |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment, net of deferred fees and costs | 3,455,125 |  | 3,286,098
Multifamily Real Estate |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment, net of deferred fees and costs | 717,719 |  | 633,743
Commercial and Industrial |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment, net of deferred fees and costs | 3,555,971 |  | 2,114,033
Residential 1-4 Family - Commercial |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment, net of deferred fees and costs | 715,384 |  | 724,337
Residential 1-4 Family - Consumer |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment, net of deferred fees and costs | 841,051 |  | 890,503
Residential 1-4 Family - Revolving |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment, net of deferred fees and costs | 627,765 |  | 659,504
Auto |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment, net of deferred fees and costs | 380,053 |  | 350,419
Consumer |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment, net of deferred fees and costs | 311,362 |  | 372,853
Other Commercial |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment, net of deferred fees and costs | 389,190 |  | $ 287,279
Paycheck Protection Program (PPP) |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Total loans held for investment, net | 1,600,000 |  |
Loans, recorded investment under the Cares Act | 1,600,000 |  |
Paycheck Protection Program (PPP) | Commercial and Industrial |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Total loans held for investment, net | 1,600,000 |  |
Loans, recorded investment under the Cares Act | 1,600,000 |  |
Paycheck Protection Program (PPP) | Other Commercial |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Total loans held for investment, net | 20,300 |  |
Loans, recorded investment under the Cares Act | $ 20,300 |  |

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