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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Recorded Investment Net of Charge offs |  |  |  |  |
Recorded Investment Net of Charge Offs, Total | $ 37,629 |  | $ 37,629 |  | $ 38,435
Unpaid Principal Balance |  |  |  |  |
Unpaid Principal Balance, Total | 38,905 |  | 38,905 |  | 39,089
Related Allowance | 1,381 |  | 1,381 |  | 1,451
Average Recorded Investment |  |  |  |  |
Average Recorded Investment, Total | 36,045 | $ 35,422 | 36,841 | $ 33,419 |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, Total | 222 | 249 | 380 | 511 |
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 | 672 |  | 448 |  |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, With no related allowance recorded | 8 |  | 8 |  |
Commercial and industrial |  |  |  |  |
Recorded Investment Net of Charge offs |  |  |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 5,642 |  | 5,642 |  | 9,138
Recorded Investment Net of Charge Offs, With an allowance recorded | 8,108 |  | 8,108 |  | 8,323
Unpaid Principal Balance |  |  |  |  |
Unpaid Principal Balance, With no related allowance recorded | 5,889 |  | 5,889 |  | 9,287
Unpaid Principal Balance, With an allowance recorded | 8,292 |  | 8,292 |  | 8,506
Related Allowance | 1,062 |  | 1,062 |  | 650
Average Recorded Investment |  |  |  |  |
Average Recorded Investment, With no related allowance recorded | 5,736 | 6,678 | 6,870 | 5,251 |
Average Recorded Investment, With an allowance recorded | 8,283 | 7,209 | 8,296 | 6,846 |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, With no related allowance recorded | 2 | 46 | 2 | 96 |
Interest Income Recognized, With an allowance recorded | 11 | 0 | 12 | 22 |
Commercial real estate - owner occupied |  |  |  |  |
Recorded Investment Net of Charge offs |  |  |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 718 |  | 718 |  | 806
Recorded Investment Net of Charge Offs, With an allowance recorded | 41 |  | 41 |  | 642
Unpaid Principal Balance |  |  |  |  |
Unpaid Principal Balance, With no related allowance recorded | 1,201 |  | 1,201 |  | 806
Unpaid Principal Balance, With an allowance recorded | 41 |  | 41 |  | 642
Related Allowance | 1 |  | 1 |  | 642
Average Recorded Investment |  |  |  |  |
Average Recorded Investment, With no related allowance recorded | 664 | 1,739 | 713 | 1,563 |
Average Recorded Investment, With an allowance recorded | 455 | 839 | 517 | 839 |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, With no related allowance recorded | 0 | 0 | 0 | 3 |
Interest Income Recognized, With an allowance recorded | 1 | 1 | 2 | 2 |
Commercial real estate - non-owner occupied |  |  |  |  |
Recorded Investment Net of Charge offs |  |  |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 2,536 |  | 2,536 |  | 160
Recorded Investment Net of Charge Offs, With an allowance recorded |  |  |  |  | 0
Unpaid Principal Balance |  |  |  |  |
Unpaid Principal Balance, With no related allowance recorded | 2,648 |  | 2,648 |  | 272
Unpaid Principal Balance, With an allowance recorded |  |  |  |  | 0
Related Allowance |  |  |  |  | 0
Average Recorded Investment |  |  |  |  |
Average Recorded Investment, With no related allowance recorded | 1,390 | 884 | 980 | 1,257 |
Average Recorded Investment, With an allowance recorded |  | 114 |  | 126 |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, With no related allowance recorded | 8 | 0 | 8 | 2 |
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 | 94 |  | 94 |  | 30
Unpaid Principal Balance |  |  |  |  |
Unpaid Principal Balance, With no related allowance recorded | 94 |  | 94 |  | 30
Average Recorded Investment |  |  |  |  |
Average Recorded Investment, With no related allowance recorded | 96 | 56 | 74 | 56 |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, With no related allowance recorded | 0 | 0 | 0 | 0 |
Residential real estate |  |  |  |  |
Recorded Investment Net of Charge offs |  |  |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 4,301 |  | 4,301 |  | 3,628
Recorded Investment Net of Charge Offs, With an allowance recorded | 4,474 |  | 4,474 |  | 5,619
Unpaid Principal Balance |  |  |  |  |
Unpaid Principal Balance, With no related allowance recorded | 4,546 |  | 4,546 |  | 3,801
Unpaid Principal Balance, With an allowance recorded | 4,479 |  | 4,479 |  | 5,656
Related Allowance | 313 |  | 313 |  | 155
Average Recorded Investment |  |  |  |  |
Average Recorded Investment, With no related allowance recorded | 3,959 | 2,660 | 3,849 | 4,001 |
Average Recorded Investment, With an allowance recorded | 4,550 | 4,953 | 4,906 | 3,399 |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, With no related allowance recorded | 2 | 0 | 2 | 1 |
Interest Income Recognized, With an allowance recorded | 38 | 45 | 63 | 84 |
Manufactured housing |  |  |  |  |
Recorded Investment Net of Charge offs |  |  |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 10,144 |  | 10,144 |  | 9,865
Recorded Investment Net of Charge Offs, With an allowance recorded | 228 |  | 228 |  | 224
Unpaid Principal Balance |  |  |  |  |
Unpaid Principal Balance, With no related allowance recorded | 10,144 |  | 10,144 |  | 9,865
Unpaid Principal Balance, With an allowance recorded | 228 |  | 228 |  | 224
Related Allowance | 5 |  | 5 |  | $ 4
Average Recorded Investment |  |  |  |  |
Average Recorded Investment, With no related allowance recorded | 10,015 | 10,074 | 9,963 | 9,937 |
Average Recorded Investment, With an allowance recorded | 225 | 216 | 225 | 144 |
Interest Income Recognized |  |  |  |  |
Interest Income Recognized, With no related allowance recorded | 146 | 152 | 277 | 293 |
Interest Income Recognized, With an allowance recorded | $ 6 | $ 5 | $ 6 | $ 8 |

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