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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses and Recorded Investment Excluding Accrued Interest in Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period   $ 81,030   $ 81,030  
(Reversal of) provision for credit losses $ (2,154) (1,107) $ 11,826 (3,261) $ 27,587
Balance at end of period 75,885     75,885  
Commercial real estate          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 82,713 84,213 82,131 84,213 61,713
Loans charged off (886)   0 (1,451) (2,076)
Recoveries of loans previously charged off 26   608 198 958
Net (charge-offs) recoveries (860)   608 (1,253) (1,118)
(Reversal of) provision for credit losses (2,154)   11,826 (3,261) 27,587
Balance at end of period 79,699 82,713 94,565 79,699 94,565
Allowance for Loan Losses          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 79,353 81,030 78,243 81,030 57,649
Loans charged off (886)   0 (1,451) (2,076)
Recoveries of loans previously charged off 26   608 198 958
Net (charge-offs) recoveries (860)   608 (1,253) (1,118)
(Reversal of) provision for credit losses (2,608)   11,519 (3,892) 26,230
Balance at end of period 75,885 79,353 90,370 75,885 90,370
Allowance for Loan Losses | Commercial real estate          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 79,353 81,030 78,243 81,030 57,649
Loans charged off (886)   0 (1,451) (2,076)
Recoveries of loans previously charged off 26   608 198 958
Net (charge-offs) recoveries (860)   608 (1,253) (1,118)
(Reversal of) provision for credit losses (2,608)   11,519 (3,892) 26,230
Balance at end of period 75,885 79,353 90,370 75,885 90,370
Allowance for Loan Losses | Commercial | Commercial and industrial          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 19,703 20,608 23,573 20,608 22,353
Loans charged off (500)   0 (1,065) (1,164)
Recoveries of loans previously charged off 23   119 68 149
Net (charge-offs) recoveries (477)   119 (997) (1,015)
(Reversal of) provision for credit losses 930   2,926 545 4,618
Balance at end of period 20,156 19,703 26,618 20,156 26,618
Allowance for Loan Losses | Commercial | Commercial real estate          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 17,100 19,074 13,620 19,074 5,941
Loans charged off 0   0 0 0
Recoveries of loans previously charged off 0   0 0 0
Net (charge-offs) recoveries 0   0 0 0
(Reversal of) provision for credit losses (676)   3,752 (2,650) 6,584
Balance at end of period 16,424 17,100 17,372 16,424 17,372
Allowance for Loan Losses | Commercial | Multifamily          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 23,884 22,512 20,072 22,512 11,405
Loans charged off 0   0 0 0
Recoveries of loans previously charged off 0   0 0 0
Net (charge-offs) recoveries 0   0 0 0
(Reversal of) provision for credit losses (2,481)   5,033 (1,109) 11,891
Balance at end of period 21,403 23,884 25,105 21,403 25,105
Allowance for Loan Losses | Commercial | SBA          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 3,451 3,145 3,652 3,145 3,120
Loans charged off (386)   0 (386) (356)
Recoveries of loans previously charged off 3   0 129 121
Net (charge-offs) recoveries (383)   0 (257) (235)
(Reversal of) provision for credit losses 628   532 808 911
Balance at end of period 3,696 3,451 4,184 3,696 4,184
Allowance for Loan Losses | Commercial | Construction          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 5,552 5,849 7,052 5,849 3,906
Loans charged off 0   0 0 0
Recoveries of loans previously charged off 0   0 0 0
Net (charge-offs) recoveries 0   0 0 0
(Reversal of) provision for credit losses (818)   (377) (1,115) 2,666
Balance at end of period 4,734 5,552 6,675 4,734 6,675
Allowance for Loan Losses | Consumer | Single Family Residential Mortgage          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 9,161 9,191 9,593 9,191 10,486
Loans charged off 0   0 0 (552)
Recoveries of loans previously charged off 0   488 0 639
Net (charge-offs) recoveries 0   488 0 87
(Reversal of) provision for credit losses (53)   (416) (83) (488)
Balance at end of period 9,108 9,161 9,665 9,108 9,665
Allowance for Loan Losses | Consumer | Other Consumer          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 502 651 681 651 438
Loans charged off 0   0 0 (4)
Recoveries of loans previously charged off 0   1 1 49
Net (charge-offs) recoveries 0   1 1 45
(Reversal of) provision for credit losses (138)   69 (288) 48
Balance at end of period $ 364 502 $ 751 364 751
Impact of adopting ASU 2016-13 | Commercial real estate          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period   0   0 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
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   $ 0   $ 0 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
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
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
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
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
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)
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