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Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Average Recorded Investment and Interest Income Recognized for Loans and Leases Considered Impaired (Details) - Loans Excluding Acquired Impaired Loans - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment | $ 104,548 | $ 79,242
Interest Income Recognized | 4,363 | 3,291
Commercial Real Estate |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment, With no related allowance recorded | 28,480 | 22,511
Average Recorded Investment, With an allowance recorded | 27,620 | 13,329
Interest Income Recognized, With no related allowance recorded | 920 | 927
Interest Income Recognized, With an allowance recorded | 1,185 | 526
Residential Real Estate |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment, With no related allowance recorded | 2,788 | 1,615
Average Recorded Investment, With an allowance recorded | 207 | 460
Interest Income Recognized, With no related allowance recorded | 109 | 26
Interest Income Recognized, With an allowance recorded | 2 | 21
Commercial and Industrial |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment, With no related allowance recorded | 16,668 | 16,991
Average Recorded Investment, With an allowance recorded | 28,785 | 21,352
Interest Income Recognized, With no related allowance recorded | 481 | 493
Interest Income Recognized, With an allowance recorded | $ 1,666 | 1,078
Construction, Land Development, and Other Land |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment, With no related allowance recorded |  | 2,984
Interest Income Recognized, With no related allowance recorded |  | $ 220

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