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Loans Receivable and Allowance for Loan Losses - Summary of Recorded Investment Net Charge-Offs, Unpaid Principal Balance and Related Allowance for Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Recorded Investment Net of Charge-offs |  |  |  |  |
Recorded Investment Net of Charge Offs, Total | $ 35,260 |  | $ 35,260 |  | $ 38,435
Unpaid Principal Balance |  |  |  |  |
Unpaid Principal Balance, Total | 36,627 |  | 36,627 |  | 39,089
Related Allowance | 1,771 |  | 1,771 |  | 1,451
Average Recorded Investment |  |  |  |  |
Average Recorded Investment, Total | 36,445 | $ 36,846 | 36,446 | $ 35,614 |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, Total | 435 | 750 | 815 | 1,261 |
Multi-family |  |  |  |  |
Recorded Investment Net of Charge-offs |  |  |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 1,343 |  | 1,343 |  |
Unpaid Principal Balance |  |  |  |  |
Unpaid Principal Balance, With no related allowance recorded | 1,343 |  | 1,343 |  |
Average Recorded Investment |  |  |  |  |
Average Recorded Investment, With no related allowance recorded | 1,343 |  | 672 |  |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, With no related allowance recorded | 0 |  | 8 |  |
Commercial and industrial |  |  |  |  |
Recorded Investment Net of Charge-offs |  |  |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 9,888 |  | 9,888 |  | 9,138
Recorded Investment Net of Charge Offs, With an allowance recorded | 3,465 |  | 3,465 |  | 8,323
Unpaid Principal Balance |  |  |  |  |
Unpaid Principal Balance, With no related allowance recorded | 10,224 |  | 10,224 |  | 9,287
Unpaid Principal Balance, With an allowance recorded | 3,648 |  | 3,648 |  | 8,506
Related Allowance | 1,381 |  | 1,381 |  | 650
Average Recorded Investment |  |  |  |  |
Average Recorded Investment, With no related allowance recorded | 7,765 | 13,345 | 7,623 | 8,796 |
Average Recorded Investment, With an allowance recorded | 5,787 | 1,963 | 7,089 | 5,400 |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, With no related allowance recorded | 166 | 354 | 168 | 450 |
Interest Income Recognized, With an allowance recorded | 27 | 0 | 39 | 22 |
Commercial real estate owner occupied |  |  |  |  |
Recorded Investment Net of Charge-offs |  |  |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 704 |  | 704 |  | 806
Recorded Investment Net of Charge Offs, With an allowance recorded | 631 |  | 631 |  | 642
Unpaid Principal Balance |  |  |  |  |
Unpaid Principal Balance, With no related allowance recorded | 1,187 |  | 1,187 |  | 806
Unpaid Principal Balance, With an allowance recorded | 631 |  | 631 |  | 642
Related Allowance | 80 |  | 80 |  | 642
Average Recorded Investment |  |  |  |  |
Average Recorded Investment, With no related allowance recorded | 711 | 1,744 | 711 | 1,589 |
Average Recorded Investment, With an allowance recorded | 336 | 1,056 | 546 | 950 |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, With no related allowance recorded | 0 | 15 | 0 | 18 |
Interest Income Recognized, With an allowance recorded | 9 | 1 | 11 | 3 |
Commercial real estate non-owner occupied |  |  |  |  |
Recorded Investment Net of Charge-offs |  |  |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 158 |  | 158 |  | 160
Recorded Investment Net of Charge Offs, With an allowance recorded |  |  |  |  | 0
Unpaid Principal Balance |  |  |  |  |
Unpaid Principal Balance, With no related allowance recorded | 271 |  | 271 |  | 272
Unpaid Principal Balance, With an allowance recorded |  |  |  |  | 0
Related Allowance |  |  |  |  | 0
Average Recorded Investment |  |  |  |  |
Average Recorded Investment, With no related allowance recorded | 1,347 | 184 | 774 | 989 |
Average Recorded Investment, With an allowance recorded |  | 51 |  | 94 |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, With no related allowance recorded | 0 | 91 | 8 | 93 |
Interest Income Recognized, With an allowance recorded |  | 0 |  | 0 |
Other |  |  |  |  |
Recorded Investment Net of Charge-offs |  |  |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 112 |  | 112 |  | 30
Recorded Investment Net of Charge Offs, With an allowance recorded |  |  |  |  | 0
Unpaid Principal Balance |  |  |  |  |
Unpaid Principal Balance, With no related allowance recorded | 112 |  | 112 |  | 30
Unpaid Principal Balance, With an allowance recorded |  |  |  |  | 0
Average Recorded Investment |  |  |  |  |
Average Recorded Investment, With no related allowance recorded | 103 | 44 | 83 | 50 |
Average Recorded Investment, With an allowance recorded |  | 12 |  | 6 |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, With no related allowance recorded | 1 | 0 | 1 | 0 |
Interest Income Recognized, With an allowance recorded |  | 0 |  | 0 |
Residential real estate |  |  |  |  |
Recorded Investment Net of Charge-offs |  |  |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 4,259 |  | 4,259 |  | 3,628
Recorded Investment Net of Charge Offs, With an allowance recorded | 4,322 |  | 4,322 |  | 5,619
Unpaid Principal Balance |  |  |  |  |
Unpaid Principal Balance, With no related allowance recorded | 4,504 |  | 4,504 |  | 3,801
Unpaid Principal Balance, With an allowance recorded | 4,329 |  | 4,329 |  | 5,656
Related Allowance | 306 |  | 306 |  | 155
Average Recorded Investment |  |  |  |  |
Average Recorded Investment, With no related allowance recorded | 4,281 | 5,228 | 3,952 | 4,865 |
Average Recorded Investment, With an allowance recorded | 4,398 | 2,862 | 4,760 | 2,729 |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, With no related allowance recorded | 23 | 125 | 25 | 126 |
Interest Income Recognized, With an allowance recorded | 61 | 0 | 124 | 84 |
Manufactured housing |  |  |  |  |
Recorded Investment Net of Charge-offs |  |  |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 10,152 |  | 10,152 |  | 9,865
Recorded Investment Net of Charge Offs, With an allowance recorded | 226 |  | 226 |  | 224
Unpaid Principal Balance |  |  |  |  |
Unpaid Principal Balance, With no related allowance recorded | 10,152 |  | 10,152 |  | 9,865
Unpaid Principal Balance, With an allowance recorded | 226 |  | 226 |  | 224
Related Allowance | 4 |  | 4 |  | $ 4
Average Recorded Investment |  |  |  |  |
Average Recorded Investment, With no related allowance recorded | 10,147 | 10,243 | 10,011 | 10,038 |
Average Recorded Investment, With an allowance recorded | 227 | 114 | 225 | 108 |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, With no related allowance recorded | 144 | 164 | 421 | 457 |
Interest Income Recognized, With an allowance recorded | $ 4 | $ 0 | $ 10 | $ 8 |

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