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Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Contractual Delinquency Information (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Mar. 31, 2021
--- | --- | --- | --- | ---
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Loans And Leases Receivables, Gross | $ 4,789,068 | $ 4,537,128 |  | $ 4,454,620
Commercial Real Estate |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Loans And Leases Receivables, Gross | 1,779,365 | 1,665,748 |  | 1,431,668
Residential Real Estate |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Loans And Leases Receivables, Gross | 494,720 | 480,514 |  | 545,279
Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Loans And Leases Receivables, Gross | 353,072 | 325,399 |  | 240,324
Commercial and Industrial |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Loans And Leases Receivables, Gross | 1,739,611 | 1,581,961 |  | 1,364,396
Paycheck Protection Program |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Loans And Leases Receivables, Gross | 36,260 | 123,712 |  | 617,006
Installment and Other |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Loans And Leases Receivables, Gross | 1,356 | 1,368 |  | 1,616
Lease Financing Receivables |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Loans And Leases Receivables, Gross | 384,684 | 358,426 | $ 384,684 | $ 254,331
Acquired Non-Impaired and Originated Loans |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, Non-accrual | 20,277 | 23,130 |  |
Loans And Leases Receivables, Gross | 4,669,317 | 4,410,077 |  |
Acquired Non-Impaired and Originated Loans | Commercial Real Estate |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, Non-accrual | 10,988 | 12,751 |  |
Loans And Leases Receivables, Gross | 1,712,273 | 1,593,588 |  |
Acquired Non-Impaired and Originated Loans | Residential Real Estate |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, Non-accrual | 1,923 | 1,450 |  |
Loans And Leases Receivables, Gross | 447,373 | 431,113 |  |
Acquired Non-Impaired and Originated Loans | Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, Non-accrual | 0 | 0 |  |
Loans And Leases Receivables, Gross | 351,715 | 324,087 |  |
Acquired Non-Impaired and Originated Loans | Commercial and Industrial |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, Non-accrual | 7,003 | 8,600 |  |
Loans And Leases Receivables, Gross | 1,735,819 | 1,577,947 |  |
Acquired Non-Impaired and Originated Loans | Paycheck Protection Program |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, Non-accrual | 0 |  |  |
Loans And Leases Receivables, Gross | 36,260 | 123,712 |  |
Acquired Non-Impaired and Originated Loans | Installment and Other |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, Non-accrual | 0 | 0 |  |
Loans And Leases Receivables, Gross | 1,193 | 1,204 |  |
Acquired Non-Impaired and Originated Loans | Lease Financing Receivables |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, Non-accrual | 363 | 329 |  |
Loans And Leases Receivables, Gross | 384,684 | 358,426 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 15,858 | 29,495 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 8,457 | 5,185 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,213 | 14,282 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 30 to 59 Days Past Due [Member] | Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 5,885 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial and Industrial |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 4,671 | 2,479 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 30 to 59 Days Past Due [Member] | Paycheck Protection Program |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 30 to 59 Days Past Due [Member] | Installment and Other |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2 | 3 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 30 to 59 Days Past Due [Member] | Lease Financing Receivables |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 515 | 1,661 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 13,164 | 4,596 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 10,684 | 2,361 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 60 to 89 Days Past Due [Member] | Residential Real Estate |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,430 | 852 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 60 to 89 Days Past Due [Member] | Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial and Industrial |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 1,097 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 60 to 89 Days Past Due [Member] | Paycheck Protection Program |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 60 to 89 Days Past Due [Member] | Installment and Other |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 34 | 35 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, 60 to 89 Days Past Due [Member] | Lease Financing Receivables |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 16 | 251 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Real Estate |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Paycheck Protection Program |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Installment and Other |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Lease Financing Receivables |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 49,299 | 57,221 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Past Due [Member] | Commercial Real Estate |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 30,129 | 20,297 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Past Due [Member] | Residential Real Estate |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 6,566 | 16,584 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Past Due [Member] | Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 5,885 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Past Due [Member] | Commercial and Industrial |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 11,674 | 12,176 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Past Due [Member] | Paycheck Protection Program |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Past Due [Member] | Installment and Other |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 36 | 38 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Past Due [Member] | Lease Financing Receivables |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 894 | 2,241 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Not Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 4,620,018 | 4,352,856 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Not Past Due [Member] | Commercial Real Estate |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,682,144 | 1,573,291 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Not Past Due [Member] | Residential Real Estate |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 440,807 | 414,529 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Not Past Due [Member] | Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 351,715 | 318,202 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Not Past Due [Member] | Commercial and Industrial |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,724,145 | 1,565,771 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Not Past Due [Member] | Paycheck Protection Program |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 36,260 | 123,712 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Not Past Due [Member] | Installment and Other |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,157 | 1,166 |  |
Acquired Non-Impaired and Originated Loans | Financial Asset, Not Past Due [Member] | Lease Financing Receivables |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 383,790 | $ 356,185 |  |

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