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Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Recorded Investment, Unpaid Principal Balance, and Related Allowance for Loans and Leases Considered Impaired (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable Impaired [Line Items] |  |
Recorded Investment |  | $ 95,355
Unpaid Principal Balance |  | 103,564
Related Allowance |  | 23,960
Loans Excluding Acquired Impaired Loans |  |
Financing Receivable Impaired [Line Items] |  |
Recorded Investment | $ 87,198 |
Unpaid Principal Balance | 97,747 |
Related Allowance | 24,562 |
Loans Excluding Acquired Impaired Loans | Commercial Real Estate |  |
Financing Receivable Impaired [Line Items] |  |
Recorded Investment, With no related allowance recorded | 20,432 | 32,473
Recorded Investment, With an allowance recorded | 25,131 | 13,696
Unpaid Principal Balance, With no related allowance recorded | 25,512 | 34,792
Unpaid Principal Balance, With an allowance recorded | 26,569 | 14,919
Related Allowance | 8,420 | 5,034
Loans Excluding Acquired Impaired Loans | Residential Real Estate |  |
Financing Receivable Impaired [Line Items] |  |
Recorded Investment, With no related allowance recorded | 3,850 | 1,558
Recorded Investment, With an allowance recorded | 96 | 272
Unpaid Principal Balance, With no related allowance recorded | 3,901 | 1,644
Unpaid Principal Balance, With an allowance recorded | 152 | 274
Related Allowance | 0 | 78
Loans Excluding Acquired Impaired Loans | Commercial and Industrial |  |
Financing Receivable Impaired [Line Items] |  |
Recorded Investment, With no related allowance recorded | 14,212 | 17,944
Recorded Investment, With an allowance recorded | 23,477 | 29,412
Unpaid Principal Balance, With no related allowance recorded | 15,999 | 19,917
Unpaid Principal Balance, With an allowance recorded | 25,614 | 32,018
Related Allowance | $ 16,142 | $ 18,848

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