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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
Total loans receivable |  |  |  | 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

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