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LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance for Loan and Lease Losses and Recorded Investment Excluding Accrued Interest in Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period $ 59,523   $ 56,678 $ 62,192 $ 49,333      
Charge-offs (35,546)   (388) (39,060) (15,977)      
Recoveries 410   82 730 864      
Net (charge-offs) recoveries (35,136)   (306) (38,330) (15,113)      
Provision for (reversal of) loan losses 38,540 $ (1,987) 1,410 39,065 23,562      
Balance at end of period 62,927 59,523 57,782 62,927 57,782      
Individually evaluated for impairment           $ 7,493   $ 902
Collectively evaluated for impairment           55,434   56,880
Total ending ALLL balance 59,523 59,523 56,678 62,192 49,333 62,927 $ 62,192 57,782
Loans:                
Individually evaluated for impairment           51,720   30,551
Collectively evaluated for impairment           6,331,539   7,222,742
Total ending loan balances           6,383,259 7,700,873 7,253,293
Commercial | Commercial and industrial                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period 21,529   16,864 18,191 14,280      
Charge-offs (34,673)   (342) (36,788) (689)      
Recoveries 59   61 102 158      
Net (charge-offs) recoveries (34,614)   (281) (36,686) (531)      
Provision for (reversal of) loan losses 37,660   (40) 43,070 2,794      
Balance at end of period 24,575 21,529 16,543 24,575 16,543      
Individually evaluated for impairment           4,614   122
Collectively evaluated for impairment           19,961   16,421
Total ending ALLL balance 21,529 21,529 16,864 18,191 14,280 24,575 18,191 16,543
Loans:                
Individually evaluated for impairment           22,042   5,614
Collectively evaluated for impairment           1,767,436   1,667,441
Total ending loan balances           1,789,478 1,944,142 1,673,055
Commercial | Commercial real estate                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period 6,877   5,732 6,674 4,971      
Charge-offs 0   0 0 0      
Recoveries 0   0 0 0      
Net (charge-offs) recoveries 0   0 0 0      
Provision for (reversal of) loan losses (298)   280 (95) 1,041      
Balance at end of period 6,579 6,877 6,012 6,579 6,012      
Individually evaluated for impairment           0   0
Collectively evaluated for impairment           6,579   6,012
Total ending ALLL balance 6,877 6,877 5,732 6,579 4,971 6,579 6,674 6,012
Loans:                
Individually evaluated for impairment           0   0
Collectively evaluated for impairment           891,029   823,193
Total ending loan balances           891,029 867,013 823,193
Commercial | Multifamily                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period 12,625   14,630 17,970 13,265      
Charge-offs 0   0 (6) (8)      
Recoveries 0   0 0 0      
Net (charge-offs) recoveries 0   0 (6) (8)      
Provision for (reversal of) loan losses (660)   843 (5,999) 2,216      
Balance at end of period 11,965 12,625 15,473 11,965 15,473      
Individually evaluated for impairment           0   0
Collectively evaluated for impairment           11,965   15,473
Total ending ALLL balance 12,625 12,625 14,630 11,965 13,265 11,965 17,970 15,473
Loans:                
Individually evaluated for impairment           0   0
Collectively evaluated for impairment           1,563,757   2,112,190
Total ending loan balances           1,563,757 2,241,246 2,112,190
Commercial | SBA                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period 3,120   1,840 1,827 1,701      
Charge-offs (738)   0 (1,086) (683)      
Recoveries 50   8 152 240      
Net (charge-offs) recoveries (688)   8 (934) (443)      
Provision for (reversal of) loan losses 1,686   22 3,225 612      
Balance at end of period 4,118 3,120 1,870 4,118 1,870      
Individually evaluated for impairment           2,858   133
Collectively evaluated for impairment           1,260   1,737
Total ending ALLL balance 3,120 3,120 1,840 4,118 1,870 4,118 1,827 1,870
Loans:                
Individually evaluated for impairment           5,696   1,834
Collectively evaluated for impairment           69,663   69,660
Total ending loan balances           75,359 68,741 71,494
Commercial | Construction                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period 3,715   3,419 3,461 3,318      
Charge-offs 0   0 0 0      
Recoveries 0   0 0 0      
Net (charge-offs) recoveries 0   0 0 0      
Provision for (reversal of) loan losses 165   (172) 419 (71)      
Balance at end of period 3,880 3,715 3,247 3,880 3,247      
Individually evaluated for impairment           0   0
Collectively evaluated for impairment           3,880   3,247
Total ending ALLL balance 3,715 3,715 3,419 3,461 3,318 3,880 3,461 3,247
Loans:                
Individually evaluated for impairment           2,519   0
Collectively evaluated for impairment           226,042   200,294
Total ending loan balances           228,561 203,976 200,294
Commercial | Lease Financing                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period 0   0 0 0      
Charge-offs 0   0 0 0      
Recoveries 3   3 9 12      
Net (charge-offs) recoveries 3   3 9 12      
Provision for (reversal of) loan losses (3)   (3) (9) (12)      
Balance at end of period 0 0 0 0 0      
Individually evaluated for impairment           0   0
Collectively evaluated for impairment           0   0
Total ending ALLL balance 0 0 0 0 0 0 0 0
Loans:                
Individually evaluated for impairment           0   0
Collectively evaluated for impairment           0   0
Total ending loan balances           0   0
Consumer | Single Family Residential Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period 11,072   13,236 13,128 10,996      
Charge-offs (135)   (45) (1,086) (524)      
Recoveries 0   0 150 436      
Net (charge-offs) recoveries (135)   (45) (936) (88)      
Provision for (reversal of) loan losses 342   407 (913) 2,690      
Balance at end of period 11,279 11,072 13,598 11,279 13,598      
Individually evaluated for impairment           0   640
Collectively evaluated for impairment           11,279   12,958
Total ending ALLL balance 11,072 11,072 13,236 11,279 13,598 11,279 13,128 13,598
Loans:                
Individually evaluated for impairment           20,641   22,364
Collectively evaluated for impairment           1,755,312   2,277,705
Total ending loan balances           1,775,953   2,300,069
Consumer | Other Consumer                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period 585   957 941 802      
Charge-offs 0   (1) (94) (14,073)      
Recoveries 298   10 317 18      
Net (charge-offs) recoveries 298   9 223 (14,055)      
Provision for (reversal of) loan losses (352)   73 (633) 14,292      
Balance at end of period 531 585 1,039 531 1,039      
Individually evaluated for impairment           21   7
Collectively evaluated for impairment           510   1,032
Total ending ALLL balance $ 585 $ 585 $ 957 $ 941 $ 802 531 $ 941 1,039
Loans:                
Individually evaluated for impairment           822   739
Collectively evaluated for impairment           58,300   72,259
Total ending loan balances           $ 59,122   $ 72,998