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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 | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable Impaired [Line Items] |  |  |
Recorded Investment | $ 68,741 | $ 35,914 | $ 31,111
Unpaid Principal Balance | 75,668 | 41,231 | 34,479
Related Allowance | 10,690 | 6,649 | 3,965
Average Recorded Investment | 51,907 | 34,687 | 21,479
Interest Income Recognized | 4,855 | 2,139 | 1,555
Commercial Real Estate |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance recorded | 16,556 | 6,110 | 11,425
Recorded Investment, With an allowance recorded | 9,840 | 5,873 | 2,459
Unpaid Principal Balance, With no related allowance recorded | 19,808 | 7,693 | 12,936
Unpaid Principal Balance, With an allowance recorded | 10,691 | 6,313 | 2,634
Related Allowance | 2,614 | 2,191 | 1,101
Average Recorded Investment, With no related allowance recorded | 11,218 | 8,968 | 10,482
Average Recorded Investment, With an allowance recorded | 8,863 | 5,328 | 1,988
Interest Income Recognized, With no related allowance recorded | 1,257 | 590 | 525
Interest Income Recognized, With an allowance recorded | 711 | 270 | 187
Residential Real Estate |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance recorded | 2,165 | 1,886 | 2,075
Recorded Investment, With an allowance recorded | 233 | 251 | 354
Unpaid Principal Balance, With no related allowance recorded | 2,253 | 1,858 | 2,046
Unpaid Principal Balance, With an allowance recorded | 233 | 253 | 351
Related Allowance | 124 | 61 | 158
Average Recorded Investment, With no related allowance recorded | 2,285 | 1,917 | 1,781
Average Recorded Investment, With an allowance recorded | 195 | 311 | 422
Interest Income Recognized, With no related allowance recorded | 192 | 43 | 72
Interest Income Recognized, With an allowance recorded | 7 | 4 | 6
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 |  |
Average Recorded Investment, With no related allowance recorded | 220 |  | 295
Average Recorded Investment, With an allowance recorded |  |  | 14
Interest Income Recognized, With no related allowance recorded | 191 |  | 2
Commercial and Industrial |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance recorded | 19,211 | 11,193 | 5,470
Recorded Investment, With an allowance recorded | 18,092 | 10,601 | 9,314
Unpaid Principal Balance, With no related allowance recorded | 20,398 | 13,961 | 6,774
Unpaid Principal Balance, With an allowance recorded | 19,285 | 11,153 | 9,724
Related Allowance | 7,952 | 4,397 | 2,692
Average Recorded Investment, With no related allowance recorded | 14,137 | 8,680 | 2,875
Average Recorded Investment, With an allowance recorded | 14,989 | 9,472 | 3,460
Interest Income Recognized, With no related allowance recorded | 1,487 | 483 | 265
Interest Income Recognized, With an allowance recorded | $ 1,010 | 749 | 486
Installment and Other |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Recorded Investment, With an allowance recorded |  |  | 14
Unpaid Principal Balance, With an allowance recorded |  |  | 14
Related Allowance |  |  | 14
Average Recorded Investment, With an allowance recorded |  | $ 11 | 162
Interest Income Recognized, With an allowance recorded |  |  | $ 12

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