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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at beginning of period $ 42,385 $ 37,483 $ 40,444 $ 35,533      
Charge-offs (959) (393) (4,214) (1,267)      
Recoveries 85 551 195 1,285      
Provision 3,561 2,592 8,647 4,682      
Balance at end of period 45,072 40,233 45,072 40,233      
Individually evaluated for impairment         $ 415   $ 665
Collectively evaluated for impairment         44,657   39,464
Total ending ALLL balance 42,385 37,483 40,444 35,533 45,072 $ 40,444 40,233
Loans:              
Individually evaluated for impairment         15,915   32,284
Collectively evaluated for impairment         6,210,982   5,894,140
Total ending loan balances         6,226,897 6,034,752 6,568,791
Purchased Credit Impaired              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at end of period 0 104 0 104      
Total ending ALLL balance 0 104 0 104 0   104
Loans:              
Total ending loan balances         0 141,826 642,367
Commercial | Commercial and industrial              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at beginning of period 10,495 8,004 7,584 5,850      
Charge-offs (571) 0 (953) (137)      
Recoveries 0 224 0 224      
Provision 2,576 (2) 5,869 2,289      
Balance at end of period 12,500 8,226 12,500 8,226      
Individually evaluated for impairment         195   0
Collectively evaluated for impairment         12,305   8,169
Total ending ALLL balance 10,495 8,004 7,584 5,850 12,500 7,584 8,226
Loans:              
Individually evaluated for impairment         497   3,397
Collectively evaluated for impairment         1,602,308   1,522,848
Total ending loan balances         1,602,805 1,522,960 1,531,041
Commercial | Commercial and industrial | Purchased Credit Impaired              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at end of period 0 57 0 57      
Total ending ALLL balance 0 57 0 57 0   57
Loans:              
Total ending loan balances         0 4,760 4,796
Commercial | Commercial real estate              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at beginning of period 5,126 3,554 5,467 4,252      
Charge-offs 0 0 (113) 0      
Recoveries 0 0 0 371      
Provision 202 1,472 (26) 403      
Balance at end of period 5,328 5,026 5,328 5,026      
Individually evaluated for impairment         0   0
Collectively evaluated for impairment         5,328   5,015
Total ending ALLL balance 5,126 3,554 5,467 4,252 5,328 5,467 5,026
Loans:              
Individually evaluated for impairment         0   0
Collectively evaluated for impairment         713,120   719,420
Total ending loan balances         713,120 729,959 721,838
Commercial | Commercial real estate | Purchased Credit Impaired              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at end of period 0 11 0 11      
Total ending ALLL balance 0 11 0 11 0   11
Loans:              
Total ending loan balances         0 1,182 2,418
Commercial | Multifamily              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at beginning of period 10,686 6,914 11,376 6,012      
Charge-offs 0 0 0 0      
Recoveries 0 0 0 0      
Provision 588 1,795 (102) 2,697      
Balance at end of period 11,274 8,709 11,274 8,709      
Individually evaluated for impairment         0   0
Collectively evaluated for impairment         11,274   8,709
Total ending ALLL balance 10,686 6,914 11,376 6,012 11,274 11,376 8,709
Loans:              
Individually evaluated for impairment         0   0
Collectively evaluated for impairment         1,617,890   1,199,207
Total ending loan balances         1,617,890 1,365,262 1,199,207
Commercial | Multifamily | Purchased Credit Impaired              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at end of period 0 0 0 0      
Total ending ALLL balance 0 0 0 0 0   0
Loans:              
Total ending loan balances         0 0 0
Commercial | SBA              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at beginning of period 1,084 697 939 683      
Charge-offs (58) 0 (351) 0      
Recoveries 83 67 157 343      
Provision 188 144 552 (118)      
Balance at end of period 1,297 908 1,297 908      
Individually evaluated for impairment         54   0
Collectively evaluated for impairment         1,243   889
Total ending ALLL balance 1,084 697 939 683 1,297 939 908
Loans:              
Individually evaluated for impairment         377   0
Collectively evaluated for impairment         78,227   64,977
Total ending loan balances         78,604 73,840 67,737
Commercial | SBA | Purchased Credit Impaired              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at end of period 0 19 0 19      
Total ending ALLL balance 0 19 0 19 0   19
Loans:              
Total ending loan balances         0 2,672 2,760
Commercial | Construction              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at beginning of period 2,974 1,677 2,015 1,530      
Charge-offs 0 0 (29) 0      
Recoveries 0 0 0 0      
Provision 238 40 1,226 187      
Balance at end of period 3,212 1,717 3,212 1,717      
Individually evaluated for impairment         0   0
Collectively evaluated for impairment         3,212   1,717
Total ending ALLL balance 2,974 1,677 2,015 1,530 3,212 2,015 1,717
Loans:              
Individually evaluated for impairment         0   0
Collectively evaluated for impairment         176,397   99,086
Total ending loan balances         176,397 125,100 99,086
Commercial | Construction | Purchased Credit Impaired              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at end of period 0 0 0 0      
Total ending ALLL balance 0 0 0 0 0   0
Loans:              
Total ending loan balances         0 0 0
Commercial | Lease financing              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at beginning of period 3 2,540 6 2,195      
Charge-offs 0 (393) 0 (974)      
Recoveries 0 98 29 183      
Provision (1) 722 (33) 1,563      
Balance at end of period 2 2,967 2 2,967      
Individually evaluated for impairment         1   0
Collectively evaluated for impairment         1   2,967
Total ending ALLL balance 3 2,540 6 2,195 2 6 2,967
Loans:              
Individually evaluated for impairment         41   0
Collectively evaluated for impairment         50   234,540
Total ending loan balances         91 379 234,540
Commercial | Lease financing | Purchased Credit Impaired              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at end of period 0 0 0 0      
Total ending ALLL balance 0 0 0 0 0   0
Loans:              
Total ending loan balances         0 0 0
Consumer | Single Family Residential Mortgage              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at beginning of period 11,009 13,143 12,075 13,854      
Charge-offs (78) 0 (2,490) (149)      
Recoveries 0 157 1 157      
Provision (564) (1,573) 781 (2,135)      
Balance at end of period 10,367 11,727 10,367 11,727      
Individually evaluated for impairment         165   665
Collectively evaluated for impairment         10,202   11,045
Total ending ALLL balance 11,009 13,143 12,075 13,854 10,367 12,075 11,727
Loans:              
Individually evaluated for impairment         14,636   28,593
Collectively evaluated for impairment         1,905,674   1,940,389
Total ending loan balances         1,920,310   2,601,375
Consumer | Single Family Residential Mortgage | Purchased Credit Impaired              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at end of period 0 17 0 17      
Total ending ALLL balance 0 17 0 17 0   17
Loans:              
Total ending loan balances         0   632,393
Consumer | Other Consumer              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at beginning of period 1,008 954 982 1,157      
Charge-offs (252) 0 (278) (7)      
Recoveries 2 5 8 7      
Provision 334 (6) 380 (204)      
Balance at end of period 1,092 953 1,092 953      
Individually evaluated for impairment         0   0
Collectively evaluated for impairment         1,092   953
Total ending ALLL balance 1,008 954 982 1,157 1,092 $ 982 953
Loans:              
Individually evaluated for impairment         364   294
Collectively evaluated for impairment         117,316   113,673
Total ending loan balances         117,680   113,967
Consumer | Other Consumer | Purchased Credit Impaired              
Allowance for Loan and Lease Losses [Roll Forward]              
Balance at end of period 0 0 0 0      
Total ending ALLL balance $ 0 $ 0 $ 0 $ 0 0   0
Loans:              
Total ending loan balances         $ 0   $ 0