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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, 2020 | Sep. 30, 2019
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment | $ 79,242 | $ 45,170
Interest Income Recognized | 3,291 | 2,457
Commercial Real Estate |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment, With no related allowance recorded | 22,511 | 9,379
Average Recorded Investment, With an allowance recorded | 13,329 | 8,238
Interest Income Recognized, With no related allowance recorded | 927 | 761
Interest Income Recognized, With an allowance recorded | 526 | 479
Residential Real Estate |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment, With no related allowance recorded | 1,615 | 1,914
Average Recorded Investment, With an allowance recorded | 460 | 207
Interest Income Recognized, With no related allowance recorded | 26 | 60
Interest Income Recognized, With an allowance recorded | 21 | 7
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 |
Commercial and Industrial |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment, With no related allowance recorded | 16,991 | 11,889
Average Recorded Investment, With an allowance recorded | 21,352 | 13,543
Interest Income Recognized, With no related allowance recorded | 493 | 482
Interest Income Recognized, With an allowance recorded | $ 1,078 | $ 668

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