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Merger - Summary of Acquired and Accounted for in Accordance With ASC 310-30 (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Business Acquisition [Line Items] |  |
Carrying amount | $ 2,328,614 | $ 1,997,879
Comunibanc Corp [Member] | Acquired Loans with Specific Evidence of Deterioration of Credit Quality (ASC 310-30) [Member] |  |
Business Acquisition [Line Items] |  |
Outstanding balance | 4,421 |
Carrying amount | $ 3,774 |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 + Details
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