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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at beginning of period $ 56,678 $ 42,385 $ 49,333 $ 40,444      
Charge-offs (388) (959) (15,977) (4,214)      
Recoveries 82 85 864 195      
Provision 1,410 3,561 23,562 8,647      
Balance at end of period 57,782 45,072 57,782 45,072      
Individually evaluated for impairment         $ 902   $ 415
Collectively evaluated for impairment         56,880   44,657
Total ending ALLL balance 56,678 42,385 49,333 40,444 57,782 $ 49,333 45,072
Loans:              
Individually evaluated for impairment         30,551   15,915
Collectively evaluated for impairment         7,222,742   6,210,982
Total ending loan balances         7,253,293 6,659,407 6,226,897
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 | Commercial and industrial              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at beginning of period 16,864 10,495 14,280 7,584      
Charge-offs (342) (571) (689) (953)      
Recoveries 61 0 158 0      
Provision (40) 2,576 2,794 5,869      
Balance at end of period 16,543 12,500 16,543 12,500      
Individually evaluated for impairment         122   195
Collectively evaluated for impairment         16,421   12,305
Total ending ALLL balance 16,864 10,495 14,280 7,584 16,543 14,280 12,500
Loans:              
Individually evaluated for impairment         5,614   497
Collectively evaluated for impairment         1,667,441   1,602,308
Total ending loan balances         1,673,055 1,701,951 1,602,805
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             0
Commercial | Commercial real estate              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at beginning of period 5,732 5,126 4,971 5,467      
Charge-offs 0 0 0 (113)      
Recoveries 0 0 0 0      
Provision 280 202 1,041 (26)      
Balance at end of period 6,012 5,328 6,012 5,328      
Individually evaluated for impairment         0   0
Collectively evaluated for impairment         6,012   5,328
Total ending ALLL balance 5,732 5,126 4,971 5,467 6,012 4,971 5,328
Loans:              
Individually evaluated for impairment         0   0
Collectively evaluated for impairment         823,193   713,120
Total ending loan balances         823,193 717,415 713,120
Commercial | Commercial real estate | 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 | Multifamily              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at beginning of period 14,630 10,686 13,265 11,376      
Charge-offs 0 0 (8) 0      
Recoveries 0 0 0 0      
Provision 843 588 2,216 (102)      
Balance at end of period 15,473 11,274 15,473 11,274      
Individually evaluated for impairment         0   0
Collectively evaluated for impairment         15,473   11,274
Total ending ALLL balance 14,630 10,686 13,265 11,376 15,473 13,265 11,274
Loans:              
Individually evaluated for impairment         0   0
Collectively evaluated for impairment         2,112,190   1,617,890
Total ending loan balances         2,112,190 1,816,141 1,617,890
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 1,840 1,084 1,701 939      
Charge-offs 0 (58) (683) (351)      
Recoveries 8 83 240 157      
Provision 22 188 612 552      
Balance at end of period 1,870 1,297 1,870 1,297      
Individually evaluated for impairment         133   54
Collectively evaluated for impairment         1,737   1,243
Total ending ALLL balance 1,840 1,084 1,701 939 1,870 1,701 1,297
Loans:              
Individually evaluated for impairment         1,834   377
Collectively evaluated for impairment         69,660   78,227
Total ending loan balances         71,494 78,699 78,604
Commercial | SBA | 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 | Construction              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at beginning of period 3,419 2,974 3,318 2,015      
Charge-offs 0 0 0 (29)      
Recoveries 0 0 0 0      
Provision (172) 238 (71) 1,226      
Balance at end of period 3,247 3,212 3,247 3,212      
Individually evaluated for impairment         0   0
Collectively evaluated for impairment         3,247   3,212
Total ending ALLL balance 3,419 2,974 3,318 2,015 3,247 3,318 3,212
Loans:              
Individually evaluated for impairment         0   0
Collectively evaluated for impairment         200,294   176,397
Total ending loan balances         200,294 182,960 176,397
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 3 0 6      
Charge-offs 0 0 0 0      
Recoveries 3 0 12 29      
Provision (3) (1) (12) (33)      
Balance at end of period 0 2 0 2      
Individually evaluated for impairment         0   1
Collectively evaluated for impairment         0   1
Total ending ALLL balance 0 3 0 6 0 0 2
Loans:              
Individually evaluated for impairment         0   41
Collectively evaluated for impairment         0   50
Total ending loan balances         0 13 91
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 13,236 11,009 10,996 12,075      
Charge-offs (45) (78) (524) (2,490)      
Recoveries 0 0 436 1      
Provision 407 (564) 2,690 781      
Balance at end of period 13,598 10,367 13,598 10,367      
Individually evaluated for impairment         640   165
Collectively evaluated for impairment         12,958   10,202
Total ending ALLL balance 13,236 11,009 10,996 12,075 13,598 10,996 10,367
Loans:              
Individually evaluated for impairment         22,364   14,636
Collectively evaluated for impairment         2,277,705   1,905,674
Total ending loan balances         2,300,069   1,920,310
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 957 1,008 802 982      
Charge-offs (1) (252) (14,073) (278)      
Recoveries 10 2 18 8      
Provision 73 334 14,292 380      
Balance at end of period 1,039 1,092 1,039 1,092      
Individually evaluated for impairment         7   0
Collectively evaluated for impairment         1,032   1,092
Total ending ALLL balance $ 957 1,008 $ 802 982 1,039 $ 802 1,092
Loans:              
Individually evaluated for impairment         739   364
Collectively evaluated for impairment         72,259   117,316
Total ending loan balances         $ 72,998   117,680
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