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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging of Recorded Investment in Past Due Loans and Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 31,617	$ 57,607
Current	5,866,788	5,894,278
Total	5,898,405	5,951,885
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	11,673	19,290
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,308	13,583
Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	17,636	24,734
NTM Loans
Financing Receivable, Past Due [Line Items]
Total	437,113	600,656
Traditional Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	20,228	37,080
Current	5,441,064	5,314,149
Total	5,461,292	5,351,229
Traditional Loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	7,473	15,317
Traditional Loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,667	10,048
Traditional Loans | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	11,088	11,715
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total	1,230,236	1,590,774
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total	33,386	54,165
Consumer | NTM Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	11,389	20,527
Current	425,724	580,129
Total	437,113	600,656
Consumer | NTM Loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	4,200	3,973
Consumer | NTM Loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	641	3,535
Consumer | NTM Loans | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	6,548	13,019
Consumer | NTM Loans | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due	11,389	20,527
Current	424,126	577,830
Total	435,515	598,357
Consumer | NTM Loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	4,200	3,973
Consumer | NTM Loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	641	3,535
Consumer | NTM Loans | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	6,548	13,019
Consumer | NTM Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	1,598	2,299
Total	1,598	2,299
Consumer | NTM Loans | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Consumer | NTM Loans | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Consumer | NTM Loans | Other consumer | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Consumer | Traditional Loans | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due	11,558	22,854
Current	783,163	969,563
Total	794,721	992,417
Consumer | Traditional Loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	6,836	13,752
Consumer | Traditional Loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	980	3,496
Consumer | Traditional Loans | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,742	5,606
Consumer | Traditional Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	277	334
Current	31,511	51,532
Total	31,788	51,866
Consumer | Traditional Loans | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	216	199
Consumer | Traditional Loans | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	61	40
Consumer | Traditional Loans | Other consumer | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	95
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	2,088,308	1,691,270
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	807,195	818,817
Commercial | Multifamily
Financing Receivable, Past Due [Line Items]
Total	1,289,820	1,494,528
Commercial | SBA
Financing Receivable, Past Due [Line Items]
Total	273,444	70,981
Commercial | Construction
Financing Receivable, Past Due [Line Items]
Total	176,016	231,350
Commercial | NTM Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial | NTM Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial | NTM Loans | Multifamily
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial | NTM Loans | SBA
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial | NTM Loans | Construction
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial | Traditional Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	4,351	10,312
Current	2,083,957	1,680,958
Total	2,088,308	1,691,270
Commercial | Traditional Loans | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	67	780
Commercial | Traditional Loans | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	5,670
Commercial | Traditional Loans | Commercial and industrial | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	4,284	3,862
Commercial | Traditional Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	807,195	818,817
Total	807,195	818,817
Commercial | Traditional Loans | Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Commercial real estate | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Commercial real estate | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Multifamily
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	1,289,820	1,494,528
Total	1,289,820	1,494,528
Commercial | Traditional Loans | Multifamily | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Multifamily | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Multifamily | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | SBA
Financing Receivable, Past Due [Line Items]
Total Past Due	4,042	3,580
Current	269,402	67,401
Total	273,444	70,981
Commercial | Traditional Loans | SBA | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	354	586
Commercial | Traditional Loans | SBA | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	626	842
Commercial | Traditional Loans | SBA | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,062	2,152
Commercial | Traditional Loans | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	176,016	231,350
Total	176,016	231,350
Commercial | Traditional Loans | Construction | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Construction | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Construction | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 0	$ 0

X

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