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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) - Loans Excluding Acquired Impaired Loans - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable Impaired [Line Items] |  |
Recorded Investment | $ 77,890 | $ 68,741
Unpaid Principal Balance | 84,163 | 75,668
Related Allowance | 14,782 | 10,690
Commercial Real Estate |  |
Financing Receivable Impaired [Line Items] |  |
Recorded Investment, With no related allowance recorded | 26,129 | 16,556
Recorded Investment, With an allowance recorded | 12,872 | 9,840
Unpaid Principal Balance, With no related allowance recorded | 27,378 | 19,808
Unpaid Principal Balance, With an allowance recorded | 14,624 | 10,691
Related Allowance | 4,516 | 2,614
Residential Real Estate |  |
Financing Receivable Impaired [Line Items] |  |
Recorded Investment, With no related allowance recorded | 1,364 | 2,165
Recorded Investment, With an allowance recorded | 272 | 233
Unpaid Principal Balance, With no related allowance recorded | 1,451 | 2,253
Unpaid Principal Balance, With an allowance recorded | 274 | 233
Related Allowance | 77 | 124
Construction, Land Development, and Other Land |  |
Financing Receivable Impaired [Line Items] |  |
Recorded Investment, With no related allowance recorded |  | 2,644
Unpaid Principal Balance, With no related allowance recorded |  | 3,000
Commercial and Industrial |  |
Financing Receivable Impaired [Line Items] |  |
Recorded Investment, With no related allowance recorded | 19,010 | 19,211
Recorded Investment, With an allowance recorded | 18,243 | 18,092
Unpaid Principal Balance, With no related allowance recorded | 20,698 | 20,398
Unpaid Principal Balance, With an allowance recorded | 19,738 | 19,285
Related Allowance | $ 10,189 | $ 7,952

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