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Merger - Additional Information (Detail) - UCB [Member] - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 14, 2018 | Dec. 31, 2018
Business Combinations [Line Items] |  |
Date of acquisition completion | Sep. 14, 2018 |
Acquisition cash paid | $ 12,675 |
Common shares issued to shareholders | 4,277,430 |
Stock and cash transaction aggregate consideration | $ 117,344 |
Total assets of UCB prior to the merger | 537,875 |
Assets, loan | 298,319 |
Assets, Deposit | $ 475,944 |
Core deposit intangibles and other intangibles, amortization period | 10 years |
Cash acquired | $ 156,472 |
Loans acquired | 298,319 |
Loans acquired with credit deterioration | 1,210 |
Deposits acquired | $ 475,900 |
Compensation Expense [Member] |  |
Business Combinations [Line Items] |  |
Acquisition-related costs |  | $ 5,231
Contracted Data Processing [Member] |  |
Business Combinations [Line Items] |  |
Acquisition-related costs |  | 5,515
Professional Services [Member] |  |
Business Combinations [Line Items] |  |
Acquisition-related costs |  | 1,638
Marketing Expense [Member] |  |
Business Combinations [Line Items] |  |
Acquisition-related costs |  | 131
Other Operating Expense [Member] |  |
Business Combinations [Line Items] |  |
Acquisition-related costs |  | $ 220

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