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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Financing Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Provision for Loan and Lease Losses |  | $ (3,000) | $ 4,500 | $ (3,700) | $ 14,371 |
Balance at beginning of period | $ 55,743 |  |  | 55,743 |  |
Balance at end of period |  | 63,629 |  | 63,629 |  |
Allowance for credit losses |  |  |  |  |  |
Balance at beginning of period | 55,743 | 66,602 |  | 55,743 |  |
Balance at end of period | 67,338 | 63,629 |  | 63,629 |  |
Provision (credit) charged to expense |  | (3,000) |  | (3,700) |  |
Losses charged off |  | (486) |  | (2,040) |  |
Recoveries |  | 513 |  | 2,031 |  |
CECL adoption | Allowance for credit losses |  |  |  |  |  |
Provision for Loan and Lease Losses | 11,595 |  |  |  |  |
Loans Receivable |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  |  |  |  |  | $ 713
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  |  |  |  |  | 54,350
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  |  |  |  |  | 680
Financing Receivable, Individually Evaluated for Impairment |  |  |  |  |  | 9,048
Financing Receivable, Collectively Evaluated for Impairment |  |  |  |  |  | 5,117,838
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model |  |  |  |  |  | 98,643
Loans Receivable | Allowance for unfunded commitment |  |  |  |  |  |
Balance at beginning of period |  | 7,709 |  |  |  |
Balance at end of period | 8,690 | 8,352 |  | 8,352 |  |
Provision (credit) charged to expense |  | 643 |  | (338) |  |
Loans Receivable | Allowance for credit losses |  |  |  |  |  |
Balance at beginning of period |  |  | 49,801 |  | 40,294 |
Balance at end of period |  |  | 54,238 |  | 54,238 |
Provision (credit) charged to expense |  |  | 4,500 |  | 14,371 |
Losses charged off |  |  | (686) |  | (2,589) |
Recoveries |  |  | 623 |  | 2,162 |
Loans Receivable | CECL adoption | Allowance for unfunded commitment |  |  |  |  |  |
Provision for Loan and Lease Losses | 8,690 |  |  |  |  |
Commercial Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  |  |  |  |  | 445
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  |  |  |  |  | 32,937
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  |  |  |  |  | 325
Financing Receivable, Individually Evaluated for Impairment |  |  |  |  |  | 3,438
Financing Receivable, Collectively Evaluated for Impairment |  |  |  |  |  | 1,550,239
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model |  |  |  |  |  | 24,613
Commercial Real Estate | Allowance for unfunded commitment |  |  |  |  |  |
Balance at beginning of period |  | 417 |  |  |  |
Balance at end of period | 354 | 338 |  | 338 |  |
Provision (credit) charged to expense |  | (79) |  | (16) |  |
Commercial Real Estate | Allowance for credit losses |  |  |  |  |  |
Balance at beginning of period | 33,707 | 30,507 | 28,905 | 33,707 | 24,334 |
Balance at end of period | 31,176 | 27,513 | 32,593 | 27,513 | 32,593 |
Provision (credit) charged to expense |  | (3,000) | 3,686 | (3,700) | 8,217 |
Recoveries |  | 6 | 2 | 37 | 42 |
Commercial Real Estate | CECL adoption | Allowance for unfunded commitment |  |  |  |  |  |
Provision for Loan and Lease Losses | 354 |  |  |  |  |
Commercial Real Estate | CECL adoption | Allowance for credit losses |  |  |  |  |  |
Provision for Loan and Lease Losses | (2,531) |  |  |  |  |
Commercial construction |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  |  |  |  |  | 3,378
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  |  |  |  |  | 143
Financing Receivable, Collectively Evaluated for Impairment |  |  |  |  |  | 1,266,847
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model |  |  |  |  |  | 2,551
Commercial construction | Allowance for unfunded commitment |  |  |  |  |  |
Balance at beginning of period |  | 354 |  |  |  |
Balance at end of period | 910 | 354 |  | 354 |  |
Provision (credit) charged to expense |  |  |  | (556) |  |
Commercial construction | Allowance for credit losses |  |  |  |  |  |
Balance at beginning of period | 3,521 | 2,215 | 2,793 | 3,521 | 3,076 |
Balance at end of period | 2,356 | 2,221 | 4,027 | 2,221 | 4,027 |
Provision (credit) charged to expense |  |  | 1,222 |  | 918 |
Losses charged off |  |  |  | (154) | (1) |
Recoveries |  | 6 | 12 | 19 | 34 |
Commercial construction | CECL adoption | Allowance for unfunded commitment |  |  |  |  |  |
Provision for Loan and Lease Losses | 910 |  |  |  |  |
Commercial construction | CECL adoption | Allowance for credit losses |  |  |  |  |  |
Provision for Loan and Lease Losses | (1,165) |  |  |  |  |
One- to four-family residential construction |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  |  |  |  |  | 90
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  |  |  |  |  | 4,382
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  |  |  |  |  | 64
Financing Receivable, Individually Evaluated for Impairment |  |  |  |  |  | 3,546
Financing Receivable, Collectively Evaluated for Impairment |  |  |  |  |  | 655,146
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model |  |  |  |  |  | 57,113
One- to four-family residential construction | Allowance for unfunded commitment |  |  |  |  |  |
Balance at beginning of period |  | 760 |  |  |  |
Balance at end of period | 917 | 765 |  | 765 |  |
Provision (credit) charged to expense |  | 5 |  | (152) |  |
One- to four-family residential construction | Allowance for credit losses |  |  |  |  |  |
Balance at beginning of period | 4,536 | 9,209 | 4,492 | 4,536 | 4,339 |
Balance at end of period | 9,069 | 9,217 | 4,432 | 9,217 | 4,432 |
Provision (credit) charged to expense |  |  | (127) |  | 17 |
Losses charged off |  | (37) |  | (179) | (40) |
Recoveries |  | 45 | 67 | 327 | 116 |
One- to four-family residential construction | CECL adoption | Allowance for unfunded commitment |  |  |  |  |  |
Provision for Loan and Lease Losses | 917 |  |  |  |  |
One- to four-family residential construction | CECL adoption | Allowance for credit losses |  |  |  |  |  |
Provision for Loan and Lease Losses | 4,533 |  |  |  |  |
Other residential |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  |  |  |  |  | 9,282
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  |  |  |  |  | 93
Financing Receivable, Collectively Evaluated for Impairment |  |  |  |  |  | 1,021,145
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model |  |  |  |  |  | 6,150
Other residential | Allowance for unfunded commitment |  |  |  |  |  |
Balance at beginning of period |  | 4,972 |  |  |  |
Balance at end of period | 5,227 | 5,160 |  | 5,160 |  |
Provision (credit) charged to expense |  | 188 |  | (67) |  |
Other residential | Allowance for credit losses |  |  |  |  |  |
Balance at beginning of period | 9,375 | 15,299 | 9,064 | 9,375 | 5,153 |
Balance at end of period | 15,207 | 15,299 | 8,731 | 15,299 | 8,731 |
Provision (credit) charged to expense |  |  | (344) |  | 3,401 |
Recoveries |  |  | 11 | 92 | 177 |
Other residential | CECL adoption | Allowance for unfunded commitment |  |  |  |  |  |
Provision for Loan and Lease Losses | 5,227 |  |  |  |  |
Other residential | CECL adoption | Allowance for credit losses |  |  |  |  |  |
Provision for Loan and Lease Losses | 5,832 |  |  |  |  |
Commercial business |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  |  |  |  |  | 14
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  |  |  |  |  | 2,331
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  |  |  |  |  | 45
Financing Receivable, Individually Evaluated for Impairment |  |  |  |  |  | 167
Financing Receivable, Collectively Evaluated for Impairment |  |  |  |  |  | 384,734
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model |  |  |  |  |  | 2,549
Commercial business | Allowance for unfunded commitment |  |  |  |  |  |
Balance at beginning of period |  | 821 |  |  |  |
Balance at end of period | 935 | 1,355 |  | 1,355 |  |
Provision (credit) charged to expense |  | 534 |  | 420 |  |
Commercial business | Allowance for credit losses |  |  |  |  |  |
Balance at beginning of period | 2,390 | 3,932 | 1,817 | 2,390 | 1,355 |
Balance at end of period | 3,889 | 3,981 | 1,906 | 3,981 | 1,906 |
Provision (credit) charged to expense |  |  | 55 |  | 424 |
Losses charged off |  | (3) | (1) | (60) | (10) |
Recoveries |  | 52 | 35 | 152 | 137 |
Commercial business | CECL adoption | Allowance for unfunded commitment |  |  |  |  |  |
Provision for Loan and Lease Losses | 935 |  |  |  |  |
Commercial business | CECL adoption | Allowance for credit losses |  |  |  |  |  |
Provision for Loan and Lease Losses | 1,499 |  |  |  |  |
Consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  |  |  |  |  | 164
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  |  |  |  |  | 2,040
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  |  |  |  |  | 10
Financing Receivable, Individually Evaluated for Impairment |  |  |  |  |  | 1,897
Financing Receivable, Collectively Evaluated for Impairment |  |  |  |  |  | 239,727
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model |  |  |  |  |  | $ 5,667
Consumer | Allowance for unfunded commitment |  |  |  |  |  |
Balance at beginning of period |  | 385 |  |  |  |
Balance at end of period | 347 | 380 |  | 380 |  |
Provision (credit) charged to expense |  | (5) |  | 33 |  |
Consumer | Allowance for credit losses |  |  |  |  |  |
Balance at beginning of period | 2,214 | 5,440 | 2,730 | 2,214 | 2,037 |
Balance at end of period | 5,641 | 5,398 | 2,549 | 5,398 | 2,549 |
Provision (credit) charged to expense |  |  | 8 |  | 1,394 |
Losses charged off |  | (446) | (685) | (1,647) | (2,538) |
Recoveries |  | $ 404 | $ 496 | $ 1,404 | $ 1,656 |
Consumer | CECL adoption | Allowance for unfunded commitment |  |  |  |  |  |
Provision for Loan and Lease Losses | 347 |  |  |  |  |
Consumer | CECL adoption | Allowance for credit losses |  |  |  |  |  |
Provision for Loan and Lease Losses | $ 3,427 |  |  |  |  |

X
- Definition The carrying amount as of the balance sheet date of loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer, for which it was deemed probable at acquisition that the investor would be unable to collect all contractually required payments, and to which the income recognition total model was not applied. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123409700&loc=d3e13503-111538 + Details
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- Definition Amount of increase in allowance for credit loss on accounts receivable, from recovery. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123409700&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 + Details
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