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Loans Receivable and Allowance for Loan Losses - Schedule of Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance $ 38,015 $ 37,315 $ 35,647    
Charge-offs (4,757) (7,127) (4,405)    
Recoveries 1,072 1,059 2,743    
Provision for loan losses 5,642 6,768 3,330    
Ending Balance 39,972 38,015 37,315    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       $ 39,118 $ 38,435
Collectively evaluated for impairment       7,077,806 6,702,825
Loans receivable, at amortized cost or lower of cost or market       7,138,498 6,768,175
Allowance for loan losses, individually evaluated for impairment       845 1,451
Allowance for loan losses, collectively evaluated for impairment       36,249 32,537
Total allowance for loan losses 38,015 37,315 35,647 39,972 38,015
Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       21,574 26,915
Allowance for loan losses, loans acquired with credit deterioration       2,878 4,027
Multi-family          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 12,168 11,602      
Charge-offs 0 0      
Recoveries 0 0      
Provision for loan losses (706) 566      
Ending Balance 11,462 12,168 11,602    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       1,155 0
Collectively evaluated for impairment       3,282,452 3,500,500
Loans receivable, at amortized cost or lower of cost or market       3,285,297 3,502,381
Allowance for loan losses, individually evaluated for impairment       539 0
Allowance for loan losses, collectively evaluated for impairment       10,923 12,168
Total allowance for loan losses 12,168 11,602 11,602 11,462 12,168
Multi-family | Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       1,690 1,881
Allowance for loan losses, loans acquired with credit deterioration       0 0
Commercial and industrial          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 10,918 11,050      
Charge-offs (1,722) (4,157)      
Recoveries 403 676      
Provision for loan losses 2,546 3,349      
Ending Balance 12,145 10,918 11,050    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       17,828 17,461
Collectively evaluated for impairment       1,355,436 1,130,865
Loans receivable, at amortized cost or lower of cost or market       1,373,800 1,149,090
Allowance for loan losses, individually evaluated for impairment       261 650
Allowance for loan losses, collectively evaluated for impairment       11,516 9,804
Total allowance for loan losses 10,918 11,050 11,050 12,145 10,918
Commercial and industrial | Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       536 764
Allowance for loan losses, loans acquired with credit deterioration       368 464
Commercial real estate owner occupied          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 3,232 2,183      
Charge-offs (747) (731)      
Recoveries 326 9      
Provision for loan losses 509 1,771      
Ending Balance 3,320 3,232 2,183    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       1,069 1,448
Collectively evaluated for impairment       567,970 472,708
Loans receivable, at amortized cost or lower of cost or market       577,477 484,728
Allowance for loan losses, individually evaluated for impairment       1 642
Allowance for loan losses, collectively evaluated for impairment       3,319 2,580
Total allowance for loan losses 3,232 2,183 2,183 3,320 3,232
Commercial real estate owner occupied | Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       8,438 10,572
Allowance for loan losses, loans acquired with credit deterioration       0 10
Commercial real estate non-owner occupied          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 7,437 7,894      
Charge-offs 0 (486)      
Recoveries 5 0      
Provision for loan losses (1,349) 29      
Ending Balance 6,093 7,437 7,894    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       129 160
Collectively evaluated for impairment       1,120,633 1,213,309
Loans receivable, at amortized cost or lower of cost or market       1,125,106 1,218,719
Allowance for loan losses, individually evaluated for impairment       0 0
Allowance for loan losses, collectively evaluated for impairment       4,161 4,630
Total allowance for loan losses 7,437 7,894 7,894 6,093 7,437
Commercial real estate non-owner occupied | Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       4,344 5,250
Allowance for loan losses, loans acquired with credit deterioration       1,932 2,807
Construction          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 979 840      
Charge-offs 0 0      
Recoveries 241 164      
Provision for loan losses (596) (25)      
Ending Balance 624 979 840    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       0 0
Collectively evaluated for impairment       56,491 85,393
Loans receivable, at amortized cost or lower of cost or market       56,491 85,393
Allowance for loan losses, individually evaluated for impairment       0 0
Allowance for loan losses, collectively evaluated for impairment       624 979
Total allowance for loan losses 979 840 840 624 979
Construction | Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       0 0
Allowance for loan losses, loans acquired with credit deterioration       0 0
Residential real estate          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 2,929 3,342      
Charge-offs (466) (415)      
Recoveries 76 72      
Provision for loan losses 1,115 (70)      
Ending Balance 3,654 2,929 3,342    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       8,631 9,247
Collectively evaluated for impairment       553,593 219,162
Loans receivable, at amortized cost or lower of cost or market       566,561 234,090
Allowance for loan losses, individually evaluated for impairment       41 155
Allowance for loan losses, collectively evaluated for impairment       3,227 2,177
Total allowance for loan losses 2,929 3,342 3,342 3,654 2,929
Residential real estate | Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       4,337 5,681
Allowance for loan losses, loans acquired with credit deterioration       386 597
Manufactured housing          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 180 286      
Charge-offs 0 0      
Recoveries 0 0      
Provision for loan losses (35) (106)      
Ending Balance 145 180 286    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       10,195 10,089
Collectively evaluated for impairment       67,528 77,587
Loans receivable, at amortized cost or lower of cost or market       79,731 90,227
Allowance for loan losses, individually evaluated for impairment       3 4
Allowance for loan losses, collectively evaluated for impairment       89 82
Total allowance for loan losses 180 286 286 145 180
Manufactured housing | Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       2,008 2,551
Allowance for loan losses, loans acquired with credit deterioration       53 94
Other          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 172 118      
Charge-offs (1,822) (1,338)      
Recoveries 21 138      
Provision for loan losses 4,158 1,254      
Ending Balance 2,529 172 118    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       111 30
Collectively evaluated for impairment       73,703 3,301
Loans receivable, at amortized cost or lower of cost or market       74,035 3,547
Allowance for loan losses, individually evaluated for impairment       0 0
Allowance for loan losses, collectively evaluated for impairment       2,390 117
Total allowance for loan losses $ 172 $ 118 $ 118 2,529 172
Other | Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       221 216
Allowance for loan losses, loans acquired with credit deterioration       $ 139 $ 55