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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

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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.

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