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Business Combinations - Summary of Fair Value Adjustments and Goodwill (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 02, 2018 | Jan. 16, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair value adjustments: |  |  |  |  |
Goodwill recognized from the mergers |  |  | $ 0 | $ 0 | $ 121,910
Premier Merger |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration transferred | $ 99,275 |  |  |  |
Cost basis of net assets on merger date | 40,629 |  |  |  |
Fair value adjustments: |  |  |  |  |
Investment securities | (135) |  |  |  |
Total loans receivable, net | (111) |  |  |  |
Other real estate owned | (1,017) |  |  |  |
Premises and equipment | 1,312 |  |  |  |
Other intangible assets | 7,075 |  |  |  |
Prepaid expenses and other assets | (1,912) |  |  |  |
Deposits | (310) |  |  |  |
Accrued expenses and other liabilities | 354 |  |  |  |
Fair value of net assets on merger date | 45,885 |  |  |  |
Goodwill recognized from the mergers | $ 53,390 |  |  |  |
Puget Sound Merger |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration transferred |  | $ 130,773 |  |  |
Cost basis of net assets on merger date |  | 54,405 |  |  |
Fair value adjustments: |  |  |  |  |
Investment securities |  | (348) |  |  |
Total loans receivable, net |  | 1,400 |  |  |
Other real estate owned |  | 0 |  |  |
Premises and equipment |  | (121) |  |  |
Other intangible assets |  | 9,207 |  |  |
Prepaid expenses and other assets |  | (2,282) |  |  |
Deposits |  | (62) |  |  |
Accrued expenses and other liabilities |  | 54 |  |  |
Fair value of net assets on merger date |  | 62,253 |  |  |
Goodwill recognized from the mergers |  | $ 68,520 |  |  |

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