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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Allowance for Loan and Lease Losses and Recorded Investment Excluding Accrued Interest in Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of period $ 49,333 $ 40,444      
Charge-offs (14,639) (357)      
Recoveries 570 66      
Provision 19,499 2,583      
Balance at end of period 54,763 42,736      
Individually evaluated for impairment     $ 1,680   $ 250
Collectively evaluated for impairment     53,083   42,325
Total ending ALLL balance 49,333 40,444 54,763 $ 49,333 42,736
Loans:          
Individually evaluated for impairment     26,057   13,395
Collectively evaluated for impairment     6,904,450   5,952,227
Total ending loan balances     6,930,507 6,659,407 6,105,321
Purchased Credit Impaired          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at end of period   161      
Total ending ALLL balance   161     161
Loans:          
Total ending loan balances         139,699
Commercial | Commercial and industrial          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of period 14,280 7,584      
Charge-offs (71) (250)      
Recoveries 61 0      
Provision 3,301 3,554      
Balance at end of period 17,571 10,888      
Individually evaluated for impairment     1,115   0
Collectively evaluated for impairment     16,456   10,888
Total ending ALLL balance 14,280 7,584 17,571 14,280 10,888
Loans:          
Individually evaluated for impairment     5,265   0
Collectively evaluated for impairment     1,633,294   1,580,969
Total ending loan balances     1,638,559 1,701,951 1,585,656
Commercial | Commercial and industrial | Purchased Credit Impaired          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at end of period   0      
Total ending ALLL balance   0     0
Loans:          
Total ending loan balances         4,687
Commercial | Commercial real estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of period 4,971 5,467      
Charge-offs 0 0      
Recoveries 0 0      
Provision 446 (924)      
Balance at end of period 5,417 4,543      
Individually evaluated for impairment     0   0
Collectively evaluated for impairment     5,417   4,538
Total ending ALLL balance 4,971 5,467 5,417 4,971 4,543
Loans:          
Individually evaluated for impairment     0   0
Collectively evaluated for impairment     773,193   749,440
Total ending loan balances     773,193 717,415 750,592
Commercial | Commercial real estate | Purchased Credit Impaired          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at end of period   5      
Total ending ALLL balance   5     5
Loans:          
Total ending loan balances         1,152
Commercial | Multifamily          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of period 13,265 11,376      
Charge-offs 0 0      
Recoveries 0 0      
Provision 954 (347)      
Balance at end of period 14,219 11,029      
Individually evaluated for impairment     0   0
Collectively evaluated for impairment     14,219   11,029
Total ending ALLL balance 13,265 11,376 14,219 13,265 11,029
Loans:          
Individually evaluated for impairment     0   0
Collectively evaluated for impairment     1,944,082   1,449,715
Total ending loan balances     1,944,082 1,816,141 1,449,715
Commercial | Multifamily | Purchased Credit Impaired          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at end of period   0      
Total ending ALLL balance   0     0
Loans:          
Total ending loan balances         0
Commercial | SBA          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of period 1,701 939      
Charge-offs (381) 0      
Recoveries 65 43      
Provision 192 164      
Balance at end of period 1,577 1,146      
Individually evaluated for impairment     124   0
Collectively evaluated for impairment     1,453   1,127
Total ending ALLL balance 1,701 939 1,577 1,701 1,146
Loans:          
Individually evaluated for impairment     359   0
Collectively evaluated for impairment     78,663   73,433
Total ending loan balances     79,022 78,699 76,040
Commercial | SBA | Purchased Credit Impaired          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at end of period   19      
Total ending ALLL balance   19     19
Loans:          
Total ending loan balances         2,607
Commercial | Construction          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of period 3,318 2,015      
Charge-offs 0 0      
Recoveries 0 0      
Provision (98) 1,003      
Balance at end of period 3,220 3,018      
Individually evaluated for impairment     0   0
Collectively evaluated for impairment     3,220   3,018
Total ending ALLL balance 3,318 2,015 3,220 3,318 3,018
Loans:          
Individually evaluated for impairment     0   1,528
Collectively evaluated for impairment     200,766   140,636
Total ending loan balances     200,766 182,960 142,164
Commercial | Construction | Purchased Credit Impaired          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at end of period   0      
Total ending ALLL balance   0     0
Loans:          
Total ending loan balances         0
Commercial | Lease financing          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of period 0 6      
Charge-offs 0 0      
Recoveries 4 19      
Provision (4) (20)      
Balance at end of period 0 5      
Individually evaluated for impairment     0   0
Collectively evaluated for impairment     0   5
Total ending ALLL balance 0 6 0 0 5
Loans:          
Individually evaluated for impairment     0   0
Collectively evaluated for impairment     3   285
Total ending loan balances     3 13 285
Commercial | Lease financing | Purchased Credit Impaired          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at end of period   0      
Total ending ALLL balance   0     0
Loans:          
Total ending loan balances         0
Consumer | Single Family Residential Mortgage          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of period 10,996 12,075      
Charge-offs (115) (81)      
Recoveries 436 1      
Provision 652 (755)      
Balance at end of period 11,969 11,240      
Individually evaluated for impairment     420   250
Collectively evaluated for impairment     11,549   10,853
Total ending ALLL balance 10,996 12,075 11,969 10,996 11,240
Loans:          
Individually evaluated for impairment     19,667   10,984
Collectively evaluated for impairment     2,181,691   1,832,818
Total ending loan balances     2,201,358   1,975,055
Consumer | Single Family Residential Mortgage | Purchased Credit Impaired          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at end of period   137      
Total ending ALLL balance   137     137
Loans:          
Total ending loan balances         131,253
Consumer | Other Consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of period 802 982      
Charge-offs (14,072) (26)      
Recoveries 4 3      
Provision 14,056 (92)      
Balance at end of period 790 867      
Individually evaluated for impairment     21   0
Collectively evaluated for impairment     769   867
Total ending ALLL balance $ 802 982 790 $ 802 867
Loans:          
Individually evaluated for impairment     766   883
Collectively evaluated for impairment     92,758   124,931
Total ending loan balances     $ 93,524   125,814
Consumer | Other Consumer | Purchased Credit Impaired          
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at end of period   0      
Total ending ALLL balance   $ 0     0
Loans:          
Total ending loan balances         $ 0