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Business Combinations - Summary of Estimated Fair Value Adjustments of Consideration Paid, Acquired Asset and Assumed Liabilities (Detail) - USD ($) | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020 | [1]
Consideration paid: |  |  |  |
Effective settlement of subordinated notes |  | $ (349,000) |  |
Fair value of liabilities assumed: |  |  |  |
Goodwill |  |  | $ 26,826,000 | $ 19,620,000
Bay Banks [Member] |  |  |  |
Consideration paid: |  |  |  |
Company's common shares issued | 9,951,743 |  |  |
Purchase price per share | $ 12.55 |  |  |
Value of common stock issued | $ 124,928,000 |  |  |
Estimated fair value of common stock | 472,000 |  |  |
Cash in lieu of fractional shares | 3,400 |  |  |
Total consideration paid | 125,403,000 |  |  |
Effective settlement of subordinated notes | (650,000) |  |  |
Total consideration paid less effective settlement of subordinated notes | 124,753,000 |  |  |
Fair value of assets acquired: |  |  |  |
Cash and due from banks | 44,066,000 |  |  |
Federal funds sold | 1,732,000 |  |  |
Certificates of deposit | 1,018,000 |  |  |
Securities available for sale | 79,505,000 |  |  |
Restricted securities | 4,385,000 |  |  |
Loans held for investment | 1,030,433,000 |  |  |
Loans held for sale | 3,814,000 |  |  |
Premises and equipment | 15,532,000 |  |  |
Right-of-use asset | 1,864,000 |  |  |
Other real estate owned | 598,000 |  |  |
Bank owned life insurance | 20,259,000 |  |  |
Mortgage servicing rights | 987,000 |  |  |
Core deposit intangible | 6,850,000 |  |  |
Deferred tax asset, net | 2,685,000 |  |  |
Other assets | 10,855,000 |  |  |
Total assets | 1,224,583,000 |  |  |
Fair value of liabilities assumed: |  |  |  |
Deposits | 1,030,888,000 |  |  |
FHLB borrowings | 10,124,000 |  |  |
FRB borrowings | 24,815,000 |  |  |
Subordinated notes | 31,850,000 |  |  |
Other liabilities | 9,359,000 |  |  |
Total liabilities | 1,107,036,000 |  |  |
Net identifiable assets acquired at fair value | 117,547,000 |  |  |
Goodwill | $ 7,206,000 |  |  |
[1] | Derived from audited December 31, 2020 Consolidated Financial Statements.

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