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LOANS AND ALLOWANCE FOR LOAN LOSSES - Aging of Recorded Investment in Past Due Loans and Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 56,342	$ 40,530
Current	6,326,917	7,660,343
Total ending loan balances	6,383,259	7,700,873	$ 7,253,293
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	23,520	19,140
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	15,602	7,544
Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	17,220	13,846
NTM Loans
Financing Receivable, Past Due [Line Items]
Total ending loan balances	6,383,259	7,700,873
Traditional Loans and Leases
Financing Receivable, Past Due [Line Items]
Total Past Due	34,582	32,483
Current	5,695,202	6,841,659
Total ending loan balances	5,729,784	6,874,142
Traditional Loans and Leases | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	13,699	11,710
Traditional Loans and Leases | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	4,490	6,927
Traditional Loans and Leases | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	16,393	13,846
Traditional Loans and Leases | Construction
Financing Receivable, Past Due [Line Items]
Total ending loan balances	228,561	203,976
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total ending loan balances	1,775,953	2,305,490
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total ending loan balances	59,122	70,265
Consumer | NTM Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	21,760	8,047
Current	631,715	818,684
Total ending loan balances	653,475	826,731
Consumer | NTM Loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	9,821	7,430
Consumer | NTM Loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	11,112	617
Consumer | NTM Loans | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	827	0
Consumer | NTM Loans | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due	21,760	8,047
Current	629,407	816,271
Total ending loan balances	651,167	824,318
Consumer | NTM Loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	9,821	7,430
Consumer | NTM Loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	11,112	617
Consumer | NTM Loans | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	827	0
Consumer | NTM Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	2,308	2,413
Total ending loan balances	2,308	2,413
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 and Leases | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due	23,687	19,679
Current	1,101,099	1,461,493
Total ending loan balances	1,124,786	1,481,172
Consumer | Traditional Loans and Leases | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	11,999	7,321
Consumer | Traditional Loans and Leases | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,370	3,160
Consumer | Traditional Loans and Leases | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	10,318	9,198
Consumer | Traditional Loans and Leases | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	764	4,151
Current	56,050	63,701
Total ending loan balances	56,814	67,852
Consumer | Traditional Loans and Leases | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	547	3,132
Consumer | Traditional Loans and Leases | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	573
Consumer | Traditional Loans and Leases | Other consumer | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	217	446
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total ending loan balances	1,789,478	1,944,142	1,673,055
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total ending loan balances	891,029	867,013	823,193
Commercial | Multifamily
Financing Receivable, Past Due [Line Items]
Total ending loan balances	1,563,757	2,241,246	2,112,190
Commercial | SBA
Financing Receivable, Past Due [Line Items]
Total ending loan balances	75,359	68,741	71,494
Commercial | Construction
Financing Receivable, Past Due [Line Items]
Total ending loan balances	228,561	203,976	$ 200,294
Commercial | Traditional Loans and Leases | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	5,243	5,286
Current	1,784,235	1,938,856
Total ending loan balances	1,789,478	1,944,142
Commercial | Traditional Loans and Leases | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	776	350
Commercial | Traditional Loans and Leases | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,890	1,596
Commercial | Traditional Loans and Leases | Commercial and industrial | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,577	3,340
Commercial | Traditional Loans and Leases | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	0	582
Current	891,029	866,431
Total ending loan balances	891,029	867,013
Commercial | Traditional Loans and Leases | Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans and Leases | Commercial real estate | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	582
Commercial | Traditional Loans and Leases | Commercial real estate | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans and Leases | Multifamily
Financing Receivable, Past Due [Line Items]
Total Past Due	0	356
Current	1,563,757	2,240,890
Total ending loan balances	1,563,757	2,241,246
Commercial | Traditional Loans and Leases | Multifamily | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	356
Commercial | Traditional Loans and Leases | Multifamily | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans and Leases | Multifamily | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans and Leases | SBA
Financing Receivable, Past Due [Line Items]
Total Past Due	2,369	1,490
Current	72,990	67,251
Total ending loan balances	75,359	68,741
Commercial | Traditional Loans and Leases | SBA | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	377	551
Commercial | Traditional Loans and Leases | SBA | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	230	77
Commercial | Traditional Loans and Leases | SBA | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,762	862
Commercial | Traditional Loans and Leases | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	2,519	939
Current	226,042	203,037
Total ending loan balances	228,561	203,976
Commercial | Traditional Loans and Leases | Construction | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans and Leases | Construction | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	939
Commercial | Traditional Loans and Leases | Construction | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 2,519	$ 0

X

- Definition

Amount of financing receivable not past due.

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