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Loans Receivable and Allowance for Loan Losses - Loans by Type and Performance Status (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing $ 19,813 $ 24,063
Non-Accrual 26,415 17,792
Current 6,695,032 6,080,136
Total loans $ 6,768,175 6,154,561
Due days for loan payments (days) 30 days  
Delinquent period (days) 90 days  
30 to 89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing $ 17,070 21,250
90 Days Or More Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 2,743 2,813
Purchased credit impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased Credit-Impaired Loans 26,915 32,570
Multi-family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 4,900 12,573
Non-Accrual 0 0
Current 3,495,600 3,200,322
Total loans 3,502,381 3,214,999
Multi-family | 30 to 89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 4,900 12,573
Multi-family | 90 Days Or More Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 0 0
Multi-family | Purchased credit impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased Credit-Impaired Loans 1,881 2,104
Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 103 350
Non-Accrual 17,392 8,443
Current 1,130,831 978,881
Total loans 1,149,090 988,711
Commercial and industrial | 30 to 89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 103 350
Commercial and industrial | 90 Days Or More Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 0 0
Commercial and industrial | Purchased credit impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased Credit-Impaired Loans 764 1,037
Commercial real estate - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 202 137
Non-Accrual 1,453 2,039
Current 472,501 379,227
Total loans 484,728 393,632
Commercial real estate - owner occupied | 30 to 89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 202 137
Commercial real estate - owner occupied | 90 Days Or More Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 0 0
Commercial real estate - owner occupied | Purchased credit impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased Credit-Impaired Loans 10,572 12,229
Commercial real estate - non-owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 93 0
Non-Accrual 160 2,057
Current 1,213,216 1,185,331
Total loans 1,218,719 1,193,715
Commercial real estate - non-owner occupied | 30 to 89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 93 0
Commercial real estate - non-owner occupied | 90 Days Or More Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 0 0
Commercial real estate - non-owner occupied | Purchased credit impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased Credit-Impaired Loans 5,250 6,327
Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 0 0
Non-Accrual 0 0
Current 85,393 64,789
Total loans 85,393 64,789
Construction | 30 to 89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 0 0
Construction | 90 Days Or More Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 0 0
Construction | Purchased credit impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased Credit-Impaired Loans 0 0
Residential real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 7,628 4,417
Non-Accrual 5,420 2,959
Current 215,361 178,559
Total loans 234,090 193,502
Residential real estate | 30 to 89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 7,628 4,417
Residential real estate | 90 Days Or More Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 0 0
Residential real estate | Purchased credit impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased Credit-Impaired Loans 5,681 7,567
Manufactured housing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 6,771 6,574
Non-Accrual 1,959 2,236
Current 78,946 89,850
Total loans 90,227 101,730
Manufactured housing | 30 to 89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 4,028 3,761
Manufactured housing | 90 Days Or More Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 2,743 2,813
Manufactured housing | Purchased credit impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased Credit-Impaired Loans 2,551 3,070
Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 116 12
Non-Accrual 31 58
Current 3,184 3,177
Total loans 3,547 3,483
Other | 30 to 89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 116 12
Other | 90 Days Or More Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due Still Accruing 0 0
Other | Purchased credit impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased Credit-Impaired Loans $ 216 $ 236