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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Adopting ASU 2016-13 (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net decrease in retained earnings | $ 4,503 | $ 4,503 |  | $ 0 |
Allowance for credit losses - loans | 78,243 | 57,649 | $ 57,649 |  |
Allowance for credit losses - unfunded loan commitments |  | 4,064 |  |  |
Commercial real estate |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans | 82,131 |  | 61,713 | $ 68,093 | $ 66,814
Unfunded Loan Commitment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans | $ 3,900 |  | 4,100 |  |
Commercial | Commercial and industrial |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 22,353 |  |  |
Commercial | Commercial real estate |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 5,941 |  |  |
Commercial | Multifamily |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 11,405 |  |  |
Commercial | SBA |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 3,120 |  |  |
Commercial | Construction |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 3,906 |  |  |
Consumer | Single family residential mortgage |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 10,486 |  |  |
Consumer | Other consumer |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 438 |  |  |
As Reported Under ASC 326 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 65,258 |  |  |
Allowance for credit losses - unfunded loan commitments |  | 2,838 |  |  |
As Reported Under ASC 326 | Commercial | Commercial and industrial |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 23,015 |  |  |
As Reported Under ASC 326 | Commercial | Commercial real estate |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 10,788 |  |  |
As Reported Under ASC 326 | Commercial | Multifamily |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 13,214 |  |  |
As Reported Under ASC 326 | Commercial | SBA |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 3,508 |  |  |
As Reported Under ASC 326 | Commercial | Construction |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 4,009 |  |  |
As Reported Under ASC 326 | Consumer | Single family residential mortgage |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 10,066 |  |  |
As Reported Under ASC 326 | Consumer | Other consumer |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 658 |  |  |
Impact of ASC 326 Adoption |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 7,609 |  |  |
Allowance for credit losses - unfunded loan commitments |  | (1,226) |  |  |
Impact of ASC 326 Adoption | Commercial real estate |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  |  | $ 6,383 |  | $ 0
Impact of ASC 326 Adoption | Commercial | Commercial and industrial |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 662 |  |  |
Impact of ASC 326 Adoption | Commercial | Commercial real estate |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 4,847 |  |  |
Impact of ASC 326 Adoption | Commercial | Multifamily |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 1,809 |  |  |
Impact of ASC 326 Adoption | Commercial | SBA |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 388 |  |  |
Impact of ASC 326 Adoption | Commercial | Construction |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | 103 |  |  |
Impact of ASC 326 Adoption | Consumer | Single family residential mortgage |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | (420) |  |  |
Impact of ASC 326 Adoption | Consumer | Other consumer |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses - loans |  | $ 220 |  |  |

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