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Loans Receivable and Allowance for Loan Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, total | $ 38,435 | $ 29,411 |
Unpaid principle balance, total | 39,089 | 30,692 |
Related allowance | 1,451 | 1,360 |
Average recorded investment, total | 36,177 | 51,428 | $ 41,091
Interest income recognized, total | 1,293 | 2,459 | 2,678
Multi-family |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, with no related allowance recorded |  | 0 |
Recorded investment net of charge offs, with an allowance recorded |  | 0 |
Unpaid principal balance, with no related allowance recorded |  | 0 |
Unpaid principal balance, with an allowance recorded |  | 0 |
Related allowance |  | 0 |
Average recorded investment, with no related allowance recorded |  | 964 | 267
Average recorded investment, with an allowance recorded |  | 232 | 0
Interest income recognized, with no related allowance recorded |  | 53 | 24
Interest income recognized, with an allowance recorded |  | 0 | 0
Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, with no related allowance recorded | 9,138 | 2,396 |
Recorded investment net of charge offs, with an allowance recorded | 8,323 | 6,120 |
Unpaid principal balance, with no related allowance recorded | 9,287 | 3,430 |
Unpaid principal balance, with an allowance recorded | 8,506 | 6,120 |
Related allowance | 650 | 1,024 |
Average recorded investment, with no related allowance recorded | 8,865 | 15,424 | 8,543
Average recorded investment, with an allowance recorded | 5,984 | 7,028 | 9,331
Interest income recognized, with no related allowance recorded | 214 | 804 | 891
Interest income recognized, with an allowance recorded | 230 | 436 | 191
Commercial real estate - owner occupied |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, with no related allowance recorded | 806 | 1,210 |
Recorded investment net of charge offs, with an allowance recorded | 642 | 840 |
Unpaid principal balance, with no related allowance recorded | 806 | 1,210 |
Unpaid principal balance, with an allowance recorded | 642 | 840 |
Related allowance | 642 | 287 |
Average recorded investment, with no related allowance recorded | 1,439 | 7,963 | 6,526
Average recorded investment, with an allowance recorded | 882 | 173 | 15
Interest income recognized, with no related allowance recorded | 70 | 426 | 454
Interest income recognized, with an allowance recorded | 0 | 0 | 1
Commercial real estate - non-owner occupied |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, with no related allowance recorded | 160 | 2,002 |
Recorded investment net of charge offs, with an allowance recorded |  | 149 |
Unpaid principal balance, with no related allowance recorded | 272 | 2,114 |
Unpaid principal balance, with an allowance recorded |  | 204 |
Related allowance |  | 14 |
Average recorded investment, with no related allowance recorded | 898 | 5,265 | 6,605
Average recorded investment, with an allowance recorded |  | 380 | 817
Interest income recognized, with no related allowance recorded | 2 | 155 | 648
Interest income recognized, with an allowance recorded |  | 0 | 12
Construction |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, with no related allowance recorded |  | 0 |
Unpaid principal balance, with no related allowance recorded |  | 0 |
Average recorded investment, with no related allowance recorded |  | 0 | 749
Interest income recognized, with no related allowance recorded |  | 0 | 0
Other |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, with no related allowance recorded | 30 | 57 |
Recorded investment net of charge offs, with an allowance recorded |  | 0 |
Unpaid principal balance, with no related allowance recorded | 30 | 57 |
Unpaid principal balance, with an allowance recorded |  | 0 |
Related allowance |  | 0 |
Average recorded investment, with no related allowance recorded | 51 | 47 | 42
Average recorded investment, with an allowance recorded |  | 29 | 83
Interest income recognized, with no related allowance recorded | 0 | 0 | 1
Interest income recognized, with an allowance recorded |  | 0 | 0
Residential real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, with no related allowance recorded | 3,628 | 6,682 |
Recorded investment net of charge offs, with an allowance recorded | 5,619 | 290 |
Unpaid principal balance, with no related allowance recorded | 3,801 | 6,749 |
Unpaid principal balance, with an allowance recorded | 5,656 | 303 |
Related allowance | 155 | 35 |
Average recorded investment, with no related allowance recorded | 4,617 | 4,567 | 2,254
Average recorded investment, with an allowance recorded | 3,307 | 395 | 426
Interest income recognized, with no related allowance recorded | 24 | 120 | 86
Interest income recognized, with an allowance recorded | 187 | 0 | 2
Manufactured housing |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, with no related allowance recorded | 9,865 | 9,665 |
Recorded investment net of charge offs, with an allowance recorded | 224 |  |
Unpaid principal balance, with no related allowance recorded | 9,865 | 9,665 |
Unpaid principal balance, with an allowance recorded | 224 |  |
Related allowance | 4 |  |
Average recorded investment, with no related allowance recorded | 10,003 | 8,961 | 5,433
Average recorded investment, with an allowance recorded | 131 |  |
Interest income recognized, with no related allowance recorded | 558 | $ 465 | $ 368
Interest income recognized, with an allowance recorded | $ 8 |  |

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