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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

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