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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance $ 37,315 $ 35,647 $ 30,932    
Charge-offs (7,127) (4,405) (13,412)    
Recoveries 1,059 2,743 1,433    
Provision for loan losses 6,768 3,330 16,694    
Ending Balance 38,015 37,315 35,647    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       $ 38,435 $ 29,411
Collectively evaluated for impairment       6,702,825 6,092,580
Loans receivable, at amortized cost or lower of cost or market       6,768,175 6,154,561
Allowance for loan losses, individually evaluated for impairment       1,451 1,360
Allowance for loan losses, collectively evaluated for impairment       32,537 31,144
Total allowance for loan losses 37,315 35,647 30,932 38,015 37,315
Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       26,915 32,570
Allowance for loan losses, loans acquired with credit deterioration       4,027 4,811
Multi-family          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 11,602 12,016      
Charge-offs 0 0      
Recoveries 0 0      
Provision for loan losses 566 (414)      
Ending Balance 12,168 11,602 12,016    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       0 0
Collectively evaluated for impairment       3,500,500 3,212,895
Total loans receivable       3,502,381 3,214,999
Allowance for loan losses, individually evaluated for impairment       0 0
Allowance for loan losses, collectively evaluated for impairment       12,168 11,602
Total allowance for loan losses 11,602 12,016 12,016 12,168 11,602
Multi-family | Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       1,881 2,104
Allowance for loan losses, loans acquired with credit deterioration       0 0
Commercial and industrial          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 11,050 8,864      
Charge-offs (4,157) (2,920)      
Recoveries 676 381      
Provision for loan losses 3,349 4,725      
Ending Balance 10,918 11,050 8,864    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       17,461 8,516
Collectively evaluated for impairment       1,130,865 979,158
Total loans receivable       1,149,090 988,711
Allowance for loan losses, individually evaluated for impairment       650 1,024
Allowance for loan losses, collectively evaluated for impairment       9,804 9,686
Total allowance for loan losses 11,050 8,864 8,864 10,918 11,050
Commercial and industrial | Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       764 1,037
Allowance for loan losses, loans acquired with credit deterioration       464 340
Commercial real estate - owner occupied          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 2,183 1,348      
Charge-offs (731) (27)      
Recoveries 9 0      
Provision for loan losses 1,771 862      
Ending Balance 3,232 2,183 1,348    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       1,448 2,050
Collectively evaluated for impairment       472,708 379,353
Total loans receivable       484,728 393,632
Allowance for loan losses, individually evaluated for impairment       642 287
Allowance for loan losses, collectively evaluated for impairment       2,580 1,896
Total allowance for loan losses 2,183 1,348 1,348 3,232 2,183
Commercial real estate - owner occupied | Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       10,572 12,229
Allowance for loan losses, loans acquired with credit deterioration       10 0
Commercial real estate - non-owner occupied          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 7,894 8,420      
Charge-offs (486) (140)      
Recoveries 0 130      
Provision for loan losses 29 (516)      
Ending Balance 7,437 7,894 8,420    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       160 2,151
Collectively evaluated for impairment       1,213,309 1,185,237
Total loans receivable       1,218,719 1,193,715
Allowance for loan losses, individually evaluated for impairment       0 14
Allowance for loan losses, collectively evaluated for impairment       4,630 4,626
Total allowance for loan losses 7,894 8,420 8,420 7,437 7,894
Commercial real estate - non-owner occupied | Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       5,250 6,327
Allowance for loan losses, loans acquired with credit deterioration       2,807 3,254
Construction          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 840 1,074      
Charge-offs 0 0      
Recoveries 164 1,854      
Provision for loan losses (25) (2,088)      
Ending Balance 979 840 1,074    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       0 0
Collectively evaluated for impairment       85,393 64,789
Total loans receivable       85,393 64,789
Allowance for loan losses, individually evaluated for impairment       0 0
Allowance for loan losses, collectively evaluated for impairment       979 772
Total allowance for loan losses 840 1,074 1,074 979 840
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 68
Residential real estate          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 3,342 3,298      
Charge-offs (415) (493)      
Recoveries 72 367      
Provision for loan losses (70) 170      
Ending Balance 2,929 3,342 3,298    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       9,247 6,972
Collectively evaluated for impairment       219,162 178,963
Total loans receivable       234,090 193,502
Allowance for loan losses, individually evaluated for impairment       155 35
Allowance for loan losses, collectively evaluated for impairment       2,177 2,414
Total allowance for loan losses 3,342 3,298 3,298 2,929 3,342
Residential real estate | Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       5,681 7,567
Allowance for loan losses, loans acquired with credit deterioration       597 893
Manufactured housing          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 286 494      
Charge-offs 0 0      
Recoveries 0 0      
Provision for loan losses (106) (208)      
Ending Balance 180 286 494    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       10,089 9,665
Collectively evaluated for impairment       77,587 88,995
Total loans receivable       90,227 101,730
Allowance for loan losses, individually evaluated for impairment       4 0
Allowance for loan losses, collectively evaluated for impairment       82 88
Total allowance for loan losses 286 494 494 180 286
Manufactured housing | Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       2,551 3,070
Allowance for loan losses, loans acquired with credit deterioration       94 198
Other          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Beginning Balance 118 133      
Charge-offs (1,338) (825)      
Recoveries 138 11      
Provision for loan losses 1,254 799      
Ending Balance 172 118 133    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually evaluated for impairment       30 57
Collectively evaluated for impairment       3,301 3,190
Total loans receivable       3,547 3,483
Allowance for loan losses, individually evaluated for impairment       0 0
Allowance for loan losses, collectively evaluated for impairment       117 60
Total allowance for loan losses $ 118 $ 133 $ 133 172 118
Other | Purchased credit impaired loans          
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Loans acquired with credit deterioration       216 236
Allowance for loan losses, loans acquired with credit deterioration       $ 55 $ 58