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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 |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Recorded Investment Net of Charge offs |  |  |
Recorded Investment Net of Charge Offs, Total | $ 34,460 |  | $ 38,435
Unpaid Principal Balance |  |  |
Unpaid Principal Balance, Total | 35,162 |  | 39,089
Related Allowance | 2,119 |  | 1,451
Average Recorded Investment |  |  |
Average Recorded Investment, Total | 36,448 | $ 34,387 |
Interest Income Recognized |  |  |
Interest Income Recognized, Total | 158 | 333 |
Commercial and industrial |  |  |
Recorded Investment Net of Charge offs |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 5,830 |  | 9,138
Recorded Investment Net of Charge Offs, With an allowance recorded | 8,458 |  | 8,323
Unpaid Principal Balance |  |  |
Unpaid Principal Balance, With no related allowance recorded | 6,029 |  | 9,287
Unpaid Principal Balance, With an allowance recorded | 8,642 |  | 8,506
Related Allowance | 986 |  | 650
Average Recorded Investment |  |  |
Average Recorded Investment, With no related allowance recorded | 7,484 | 4,248 |
Average Recorded Investment, With an allowance recorded | 8,390 | 8,837 |
Interest Income Recognized |  |  |
Interest Income Recognized, With no related allowance recorded | 0 | 50 |
Interest Income Recognized, With an allowance recorded | 1 | 81 |
Commercial real estate - owner occupied |  |  |
Recorded Investment Net of Charge offs |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 614 |  | 806
Recorded Investment Net of Charge Offs, With an allowance recorded | 869 |  | 642
Unpaid Principal Balance |  |  |
Unpaid Principal Balance, With no related allowance recorded | 614 |  | 806
Unpaid Principal Balance, With an allowance recorded | 869 |  | 642
Related Allowance | 764 |  | 642
Average Recorded Investment |  |  |
Average Recorded Investment, With no related allowance recorded | 710 | 1,435 |
Average Recorded Investment, With an allowance recorded | 756 | 844 |
Interest Income Recognized |  |  |
Interest Income Recognized, With no related allowance recorded | 0 | 15 |
Interest Income Recognized, With an allowance recorded | 1 | 1 |
Commercial real estate - non-owner occupied |  |  |
Recorded Investment Net of Charge offs |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 242 |  | 160
Recorded Investment Net of Charge Offs, With an allowance recorded |  |  | 0
Unpaid Principal Balance |  |  |
Unpaid Principal Balance, With no related allowance recorded | 353 |  | 272
Unpaid Principal Balance, With an allowance recorded |  |  | 0
Related Allowance |  |  | 0
Average Recorded Investment |  |  |
Average Recorded Investment, With no related allowance recorded | 201 | 1,794 |
Average Recorded Investment, With an allowance recorded |  | 138 |
Interest Income Recognized |  |  |
Interest Income Recognized, With no related allowance recorded | 0 | 2 |
Interest Income Recognized, With an allowance recorded |  | 0 |
Other |  |  |
Recorded Investment Net of Charge offs |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 97 |  | 30
Unpaid Principal Balance |  |  |
Unpaid Principal Balance, With no related allowance recorded | 97 |  | 30
Average Recorded Investment |  |  |
Average Recorded Investment, With no related allowance recorded | 63 | 57 |
Interest Income Recognized |  |  |
Interest Income Recognized, With no related allowance recorded | 0 | 0 |
Residential real estate |  |  |
Recorded Investment Net of Charge offs |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 3,617 |  | 3,628
Recorded Investment Net of Charge Offs, With an allowance recorded | 4,625 |  | 5,619
Unpaid Principal Balance |  |  |
Unpaid Principal Balance, With no related allowance recorded | 3,788 |  | 3,801
Unpaid Principal Balance, With an allowance recorded | 4,662 |  | 5,656
Related Allowance | 365 |  | 155
Average Recorded Investment |  |  |
Average Recorded Investment, With no related allowance recorded | 3,623 | 4,502 |
Average Recorded Investment, With an allowance recorded | 5,122 | 2,597 |
Interest Income Recognized |  |  |
Interest Income Recognized, With no related allowance recorded | 0 | 1 |
Interest Income Recognized, With an allowance recorded | 25 | 39 |
Manufactured housing |  |  |
Recorded Investment Net of Charge offs |  |  |
Recorded Investment Net of Charge Offs, With no related allowance recorded | 9,886 |  | 9,865
Recorded Investment Net of Charge Offs, With an allowance recorded | 222 |  | 224
Unpaid Principal Balance |  |  |
Unpaid Principal Balance, With no related allowance recorded | 9,886 |  | 9,865
Unpaid Principal Balance, With an allowance recorded | 222 |  | 224
Related Allowance | 4 |  | $ 4
Average Recorded Investment |  |  |
Average Recorded Investment, With no related allowance recorded | 9,876 | 9,833 |
Average Recorded Investment, With an allowance recorded | 223 | 102 |
Interest Income Recognized |  |  |
Interest Income Recognized, With no related allowance recorded | 131 | 141 |
Interest Income Recognized, With an allowance recorded | $ 0 | $ 3 |

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