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Loans Receivable and Allowance for Loan Losses - Non-Covered Loans and Covered Loans by Class and Performance Status (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due $ 6,757 $ 24,063
Non-Accrual 19,171 17,792
Current 6,670,538 6,067,889
Loans receivable 6,723,278 6,142,390
Loans receivable, gross $ 6,725,504 6,142,314
Due days for loan payments 30 days  
Delinquent period 90 days  
Purchased Credit Impaired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 29,038 32,570
30-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 3,594 21,250
90 Days or More Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 3,163 2,813
Multi-family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 12,573
Non-Accrual 0 0
Current 3,397,645 3,200,322
Loans receivable, gross 3,399,617 3,214,999
Multi-family | Purchased Credit Impaired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 1,972 2,104
Multi-family | 30-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 12,573
Multi-family | 90 Days or More Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 350
Non-Accrual 10,051 8,443
Current 1,051,303 967,391
Loans receivable, gross 1,062,283 977,221
Commercial and industrial | Purchased Credit Impaired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 929 1,037
Commercial and industrial | 30-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 350
Commercial and industrial | 90 Days or More Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Commercial real estate - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 137
Non-Accrual 2,645 2,039
Current 429,283 379,227
Loans receivable, gross 443,204 393,632
Commercial real estate - owner occupied | Purchased Credit Impaired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 11,276 12,229
Commercial real estate - owner occupied | 30-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 137
Commercial real estate - owner occupied | 90 Days or More Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Commercial real estate - non-owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Non-Accrual 285 2,057
Current 1,209,987 1,185,331
Loans receivable, gross 1,216,012 1,193,715
Commercial real estate - non-owner occupied | Purchased Credit Impaired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 5,740 6,327
Commercial real estate - non-owner occupied | 30-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Commercial real estate - non-owner occupied | 90 Days or More Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Non-Accrual 0 0
Current 61,226 64,789
Loans receivable, gross 61,226 64,789
Construction | Purchased Credit Impaired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 0 0
Construction | 30-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Construction | 90 Days or More Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Residential real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 1,113 4,417
Non-Accrual 4,059 2,959
Current 433,243 178,559
Loans receivable, gross 444,453 193,502
Residential real estate | Purchased Credit Impaired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 6,038 7,567
Residential real estate | 30-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 1,113 4,417
Residential real estate | 90 Days or More Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Manufactured housing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 5,643 6,574
Non-Accrual 2,075 2,236
Current 85,570 89,850
Loans receivable, gross 96,148 101,730
Manufactured housing | Purchased Credit Impaired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 2,860 3,070
Manufactured housing | 30-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 2,480 3,761
Manufactured housing | 90 Days or More Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 3,163 2,813
Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 1 12
Non-Accrual 56 58
Current 2,281 2,420
Loans receivable, gross 2,561 2,726
Other | Purchased Credit Impaired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 223 236
Other | 30-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 1 12
Other | 90 Days or More Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due $ 0 $ 0