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LOANS AND ALLOWANCE FOR LOAN LOSSES - Aging of Recorded Investment in Past Due Loans and Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 52,210	$ 40,530
Current	6,667,360	7,660,343
Total ending loan balances	6,719,570	7,700,873	$ 7,036,004
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	29,928	19,140
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	5,010	7,544
Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	17,272	13,846
NTM Loans
Financing Receivable, Past Due [Line Items]
Total ending loan balances	6,719,570	7,700,873
Traditional Loans and Leases
Financing Receivable, Past Due [Line Items]
Total Past Due	31,423	32,483
Current	5,940,881	6,841,659
Total ending loan balances	5,972,304	6,874,142
Traditional Loans and Leases | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	9,968	11,710
Traditional Loans and Leases | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	5,010	6,927
Traditional Loans and Leases | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	16,445	13,846
Traditional Loans and Leases | Construction
Financing Receivable, Past Due [Line Items]
Total ending loan balances	209,029	203,976
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total ending loan balances	1,951,707	1,944,142	1,742,559
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total ending loan balances	856,497	867,013	793,855
Commercial | Multifamily
Financing Receivable, Past Due [Line Items]
Total ending loan balances	1,598,978	2,241,246	1,959,965
Commercial | SBA
Financing Receivable, Past Due [Line Items]
Total ending loan balances	80,929	68,741	78,092
Commercial | Construction
Financing Receivable, Past Due [Line Items]
Total ending loan balances	209,029	203,976	$ 211,110
Commercial | Traditional Loans and Leases | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	6,077	5,286
Current	1,945,630	1,938,856
Total ending loan balances	1,951,707	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	1,063	350
Commercial | Traditional Loans and Leases | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	997	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	4,017	3,340
Commercial | Traditional Loans and Leases | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	0	582
Current	856,497	866,431
Total ending loan balances	856,497	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	1,598,978	2,240,890
Total ending loan balances	1,598,978	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	3,689	1,490
Current	77,240	67,251
Total ending loan balances	80,929	68,741
Commercial | Traditional Loans and Leases | SBA | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	944	551
Commercial | Traditional Loans and Leases | SBA | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	73	77
Commercial | Traditional Loans and Leases | SBA | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,672	862
Commercial | Traditional Loans and Leases | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	2,519	939
Current	206,510	203,037
Total ending loan balances	209,029	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
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total ending loan balances	1,961,065	2,305,490
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total ending loan balances	61,365	70,265
Consumer | NTM Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	20,787	8,047
Current	726,479	818,684
Total ending loan balances	747,266	826,731
Consumer | NTM Loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	19,960	7,430
Consumer | NTM Loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	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	20,787	8,047
Current	724,232	816,271
Total ending loan balances	745,019	824,318
Consumer | NTM Loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	19,960	7,430
Consumer | NTM Loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	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	2,247	2,413
Total ending loan balances	2,247	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	17,775	19,679
Current	1,198,271	1,461,493
Total ending loan balances	1,216,046	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	7,447	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	3,645	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	6,683	9,198
Consumer | Traditional Loans and Leases | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	1,363	4,151
Current	57,755	63,701
Total ending loan balances	59,118	67,852
Consumer | Traditional Loans and Leases | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	514	3,132
Consumer | Traditional Loans and Leases | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	295	573
Consumer | Traditional Loans and Leases | Other consumer | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 554	$ 446

X

- Definition

Amount of financing receivable not past due.

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