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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 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period $ 54,763 $ 49,333 $ 42,736 $ 49,333 $ 40,444      
Charge-offs (950)   (2,898) (15,589) (3,255)      
Recoveries 212   44 782 110      
Provision 2,653   2,503 22,152 5,086      
Balance at end of period 56,678 54,763 42,385 56,678 42,385      
Individually evaluated for impairment           $ 1,188   $ 424
Collectively evaluated for impairment           55,490   41,937
Total ending ALLL balance 54,763 49,333 42,736 49,333 40,444 56,678 $ 49,333 42,385
Loans:                
Individually evaluated for impairment           27,365   10,844
Collectively evaluated for impairment           7,008,639   5,941,192
Total ending loan balances           7,036,004 6,659,407 5,956,337
Purchased Credit Impaired                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at end of period     24   24      
Total ending ALLL balance     24   24     24
Loans:                
Total ending loan balances               4,301
Commercial | Commercial and industrial                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period 17,571 14,280 10,888 14,280 7,584      
Charge-offs (276)   (132) (347) (382)      
Recoveries 36   0 97 0      
Provision (467)   (261) 2,834 3,293      
Balance at end of period 16,864 17,571 10,495 16,864 10,495      
Individually evaluated for impairment           595   0
Collectively evaluated for impairment           16,269   10,495
Total ending ALLL balance 17,571 14,280 10,888 14,280 7,584 16,864 14,280 10,495
Loans:                
Individually evaluated for impairment           5,829   0
Collectively evaluated for impairment           1,736,730   1,560,264
Total ending loan balances           1,742,559 1,701,951 1,560,916
Commercial | Commercial and industrial | Purchased Credit Impaired                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at end of period     0   0      
Total ending ALLL balance     0   0     0
Loans:                
Total ending loan balances               652
Commercial | Commercial real estate                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period 5,417 4,971 4,543 4,971 5,467      
Charge-offs 0   (113) 0 (113)      
Recoveries 0   0 0 0      
Provision 315   696 761 (228)      
Balance at end of period 5,732 5,417 5,126 5,732 5,126      
Individually evaluated for impairment           0   0
Collectively evaluated for impairment           5,732   5,121
Total ending ALLL balance 5,417 4,971 4,543 4,971 5,467 5,732 4,971 5,126
Loans:                
Individually evaluated for impairment           0   0
Collectively evaluated for impairment           793,855   715,650
Total ending loan balances           793,855 717,415 716,771
Commercial | Commercial real estate | Purchased Credit Impaired                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at end of period     5   5      
Total ending ALLL balance     5   5     5
Loans:                
Total ending loan balances               1,121
Commercial | Multifamily                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period 14,219 13,265 11,029 13,265 11,376      
Charge-offs (8)   0 (8) 0      
Recoveries 0   0 0 0      
Provision 419   (343) 1,373 (690)      
Balance at end of period 14,630 14,219 10,686 14,630 10,686      
Individually evaluated for impairment           0   0
Collectively evaluated for impairment           14,630   10,686
Total ending ALLL balance 14,219 13,265 11,029 13,265 11,376 14,630 13,265 10,686
Loans:                
Individually evaluated for impairment           0   0
Collectively evaluated for impairment           1,959,965   1,545,888
Total ending loan balances           1,959,965 1,816,141 1,545,888
Commercial | Multifamily | Purchased Credit Impaired                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at end of period     0   0      
Total ending ALLL balance     0   0     0
Loans:                
Total ending loan balances               0
Commercial | SBA                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period 1,577 1,701 1,146 1,701 939      
Charge-offs (302)   (293) (683) (293)      
Recoveries 167   31 232 74      
Provision 398   200 590 364      
Balance at end of period 1,840 1,577 1,084 1,840 1,084      
Individually evaluated for impairment           124   0
Collectively evaluated for impairment           1,716   1,065
Total ending ALLL balance 1,577 1,701 1,146 1,701 939 1,840 1,701 1,084
Loans:                
Individually evaluated for impairment           646   0
Collectively evaluated for impairment           77,446   74,726
Total ending loan balances           78,092 78,699 77,254
Commercial | SBA | Purchased Credit Impaired                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at end of period     19   19      
Total ending ALLL balance     19   19     19
Loans:                
Total ending loan balances               2,528
Commercial | Construction                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period 3,220 3,318 3,018 3,318 2,015      
Charge-offs 0   (29) 0 (29)      
Recoveries 0   0 0 0      
Provision 199   (15) 101 988      
Balance at end of period 3,419 3,220 2,974 3,419 2,974      
Individually evaluated for impairment           0   0
Collectively evaluated for impairment           3,419   2,974
Total ending ALLL balance 3,220 3,318 3,018 3,318 2,015 3,419 3,318 2,974
Loans:                
Individually evaluated for impairment           0   0
Collectively evaluated for impairment           211,110   156,246
Total ending loan balances           211,110 182,960 156,246
Commercial | Construction | Purchased Credit Impaired                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at end of period     0   0      
Total ending ALLL balance     0   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 0 5 0 6      
Charge-offs 0   0 0 0      
Recoveries 5   10 9 29      
Provision (5)   (12) (9) (32)      
Balance at end of period 0 0 3 0 3      
Individually evaluated for impairment           0   0
Collectively evaluated for impairment           0   3
Total ending ALLL balance 0 0 5 0 6 0 0 3
Loans:                
Individually evaluated for impairment           0   0
Collectively evaluated for impairment           0   173
Total ending loan balances           0 13 173
Commercial | Lease financing | Purchased Credit Impaired                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at end of period     0   0      
Total ending ALLL balance     0   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 11,969 10,996 11,240 10,996 12,075      
Charge-offs (364)   (2,331) (479) (2,412)      
Recoveries 0   0 436 1      
Provision 1,631   2,100 2,283 1,345      
Balance at end of period 13,236 11,969 11,009 13,236 11,009      
Individually evaluated for impairment           461   424
Collectively evaluated for impairment           12,775   10,585
Total ending ALLL balance 11,969 10,996 11,240 10,996 12,075 13,236 10,996 11,009
Loans:                
Individually evaluated for impairment           20,140   9,971
Collectively evaluated for impairment           2,154,043   1,768,565
Total ending loan balances           2,174,183   1,778,536
Consumer | Single Family Residential Mortgage | Purchased Credit Impaired                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at end of period     0   0      
Total ending ALLL balance     0   0     0
Loans:                
Total ending loan balances               0
Consumer | Other Consumer                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at beginning of period 790 802 867 802 982      
Charge-offs 0   0 (14,072) (26)      
Recoveries 4   3 8 6      
Provision 163   138 14,219 46      
Balance at end of period 957 790 1,008 957 1,008      
Individually evaluated for impairment           8   0
Collectively evaluated for impairment           949   1,008
Total ending ALLL balance $ 790 $ 802 867 $ 802 982 957 $ 802 1,008
Loans:                
Individually evaluated for impairment           750   873
Collectively evaluated for impairment           75,490   119,680
Total ending loan balances           $ 76,240   120,553
Consumer | Other Consumer | Purchased Credit Impaired                
Allowance for Loan and Lease Losses [Roll Forward]                
Balance at end of period     0   0      
Total ending ALLL balance     $ 0   $ 0     0
Loans:                
Total ending loan balances               $ 0