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Loans Receivable and Allowance for Loan Losses - Schedule of Accruing and Nonaccrual TDRs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 473 | $ 182 | $ 1,458 | $ 7,560 |
Commercial and industrial (including owner occupied commercial real estate) |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 0 | 6,203 |
Manufactured housing |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 321 | 182 | 1,093 | 1,357 |
Residential real estate |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 152 | $ 0 | 352 | 0 |
Other |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 13 | $ 0 |
Accruing |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 11,619 |  | $ 12,021
Accruing | Commercial and industrial (including owner occupied commercial real estate) |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 66 |  | 63
Accruing | Commercial real estate owner occupied |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 37 |  | 0
Accruing | Manufactured housing |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 8,457 |  | 8,130
Accruing | Residential real estate |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 3,059 |  | 3,828
Accruing | Other |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 0 |  | 0
Nonaccruing |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 7,803 |  | 8,408
Nonaccruing | Commercial and industrial (including owner occupied commercial real estate) |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 5,311 |  | 5,939
Nonaccruing | Commercial real estate owner occupied |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 0 |  | 0
Nonaccruing | Manufactured housing |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 1,781 |  | 1,766
Nonaccruing | Residential real estate |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 698 |  | 703
Nonaccruing | Other |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 13 |  | 0
Total |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 19,422 |  | 20,429
Total | Commercial and industrial (including owner occupied commercial real estate) |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 5,377 |  | 6,002
Total | Commercial real estate owner occupied |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 37 |  | 0
Total | Manufactured housing |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 10,238 |  | 9,896
Total | Residential real estate |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | 3,757 |  | 4,531
Total | Other |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  | $ 13 |  | $ 0

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