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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses and Recorded Investment Excluding Accrued Interest in Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 57,649    
Provision for (reversal of) credit losses 15,761 $ (2,976) $ 2,098
Balance at end of period 78,243 57,649  
Loans:      
Individually evaluated for impairment 62,446   32,964
Collectively evaluated for impairment 5,605,018   7,524,236
Total 5,667,464 5,951,885 7,557,200
Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 61,713   66,814
Charge-offs (2,076)   (1,063)
Recoveries of loans previously charged off 350   244
Net (charge-offs) recoveries (1,726)   (819)
Provision for (reversal of) credit losses 15,761   2,098
Balance at end of period 82,131 61,713 68,093
Commercial | Commercial and industrial      
Loans:      
Individually evaluated for impairment 24,594   4,861
Collectively evaluated for impairment 1,553,629   1,902,241
Total 1,578,223 1,691,270 1,907,102
Commercial | Commercial real estate      
Loans:      
Individually evaluated for impairment 2,763   573
Collectively evaluated for impairment 807,261   864,948
Total 810,024 818,817 865,521
Commercial | Multifamily      
Loans:      
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 1,466,083   2,332,527
Total 1,466,083 1,494,528 2,332,527
Commercial | SBA      
Loans:      
Individually evaluated for impairment 5,292   3,808
Collectively evaluated for impairment 65,291   71,190
Total 70,583 70,981 74,998
Commercial | Construction      
Loans:      
Individually evaluated for impairment 0   2,519
Collectively evaluated for impairment 227,947   209,030
Total 227,947 231,350 211,549
Commercial | Lease Financing      
Loans:      
Individually evaluated for impairment     0
Collectively evaluated for impairment     0
Total     0
Consumer | Single Family Residential Mortgage      
Loans:      
Individually evaluated for impairment 29,183   20,362
Collectively evaluated for impairment 1,438,192   2,082,332
Total 1,467,375   2,102,694
Consumer | Other Consumer      
Loans:      
Individually evaluated for impairment 614   841
Collectively evaluated for impairment 46,615   61,968
Total 47,229   62,809
Allowance for Loan Losses      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 57,649   62,192
Charge-offs (2,076)   (1,063)
Recoveries of loans previously charged off 350   244
Net (charge-offs) recoveries (1,726)   (819)
Provision for (reversal of) credit losses 14,711   2,512
Balance at end of period 78,243 57,649 63,885
Individually evaluated for impairment 5,814   1,945
Collectively evaluated for impairment 72,429   61,940
Allowance for Loan Losses | Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 57,649   62,192
Charge-offs (2,076)   (1,063)
Recoveries of loans previously charged off 350   244
Net (charge-offs) recoveries (1,726)   (819)
Provision for (reversal of) credit losses 14,711   2,512
Balance at end of period 78,243 57,649 63,885
Allowance for Loan Losses | Commercial | Commercial and industrial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 22,353   18,191
Charge-offs (1,164)   (93)
Recoveries of loans previously charged off 30   33
Net (charge-offs) recoveries (1,134)   (60)
Provision for (reversal of) credit losses 1,692   762
Balance at end of period 23,573 22,353 18,893
Individually evaluated for impairment 3,606   48
Collectively evaluated for impairment 19,967   18,845
Allowance for Loan Losses | Commercial | Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 5,941   6,674
Charge-offs 0   0
Recoveries of loans previously charged off 0   0
Net (charge-offs) recoveries 0   0
Provision for (reversal of) credit losses 2,832   164
Balance at end of period 13,620 5,941 6,838
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 13,620   6,838
Allowance for Loan Losses | Commercial | Multifamily      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 11,405   17,970
Charge-offs 0   0
Recoveries of loans previously charged off 0   0
Net (charge-offs) recoveries 0   0
Provision for (reversal of) credit losses 6,858   928
Balance at end of period 20,072 11,405 18,898
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 20,072   18,898
Allowance for Loan Losses | Commercial | SBA      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 3,120   1,827
Charge-offs (356)   (356)
Recoveries of loans previously charged off 121   41
Net (charge-offs) recoveries (235)   (315)
Provision for (reversal of) credit losses 379   1,545
Balance at end of period 3,652 3,120 3,057
Individually evaluated for impairment 2,208   1,634
Collectively evaluated for impairment 1,444   1,423
Allowance for Loan Losses | Commercial | Construction      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 3,906   3,461
Charge-offs 0   0
Recoveries of loans previously charged off 0   0
Net (charge-offs) recoveries 0   0
Provision for (reversal of) credit losses 3,043   (8)
Balance at end of period 7,052 3,906 3,453
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 7,052   3,453
Allowance for Loan Losses | Commercial | Lease Financing      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period     0
Charge-offs     0
Recoveries of loans previously charged off     3
Net (charge-offs) recoveries     3
Provision for (reversal of) credit losses     (3)
Balance at end of period     0
Individually evaluated for impairment     0
Collectively evaluated for impairment     0
Allowance for Loan Losses | Consumer | Single Family Residential Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 10,486   13,128
Charge-offs (552)   (526)
Recoveries of loans previously charged off 151   150
Net (charge-offs) recoveries (401)   (376)
Provision for (reversal of) credit losses (72)   (610)
Balance at end of period 9,593 10,486 12,142
Individually evaluated for impairment 0   230
Collectively evaluated for impairment 9,593   11,912
Allowance for Loan Losses | Consumer | Other Consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 438   941
Charge-offs (4)   (88)
Recoveries of loans previously charged off 48   17
Net (charge-offs) recoveries 44   (71)
Provision for (reversal of) credit losses (21)   (266)
Balance at end of period 681 438 604
Individually evaluated for impairment 0   33
Collectively evaluated for impairment 681   571
Impact of adopting ASU 2016-13 | Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 6,383   0
Balance at end of period   6,383  
Impact of adopting ASU 2016-13 | Allowance for Loan Losses      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 7,609    
Balance at end of period   7,609  
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 7,609   $ 0
Balance at end of period   7,609  
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Commercial | Commercial and industrial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 662    
Balance at end of period   662  
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Commercial | Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 4,847    
Balance at end of period   4,847  
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Commercial | Multifamily      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 1,809    
Balance at end of period   1,809  
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Commercial | SBA      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 388    
Balance at end of period   388  
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Commercial | Construction      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 103    
Balance at end of period   103  
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Consumer | Single Family Residential Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period (420)    
Balance at end of period   (420)  
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Consumer | Other Consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 220    
Balance at end of period   $ 220