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Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Risk Rating Categories of Loans and Leases Considered for Inclusion in Allowance for Loan and Lease Losses Calculation (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Mar. 31, 2021
--- | --- | --- | --- | ---
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | $ 4,789,068 | $ 4,537,128 |  | $ 4,454,620
Commercial Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 1,779,365 | 1,665,748 |  | 1,431,668
Residential Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 494,720 | 480,514 |  | 545,279
Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 353,072 | 325,399 |  | 240,324
Commercial and Industrial |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 1,739,611 | 1,581,961 |  | 1,364,396
Paycheck Protection Program |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 36,260 | 123,712 |  | 617,006
Installment and Other |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 1,356 | 1,368 |  | 1,616
Lease Financing Receivables |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 384,684 | 358,426 | $ 384,684 | $ 254,331
Loans Excluding Acquired Impaired Loans |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 4,669,317 | 4,410,077 |  |
Loans Excluding Acquired Impaired Loans | Commercial Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 1,712,273 | 1,593,588 |  |
Loans Excluding Acquired Impaired Loans | Residential Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 447,373 | 431,113 |  |
Loans Excluding Acquired Impaired Loans | Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 351,715 | 324,087 |  |
Loans Excluding Acquired Impaired Loans | Commercial and Industrial |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 1,735,819 | 1,577,947 |  |
Loans Excluding Acquired Impaired Loans | Paycheck Protection Program |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 36,260 | 123,712 |  |
Loans Excluding Acquired Impaired Loans | Installment and Other |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 1,193 | 1,204 |  |
Loans Excluding Acquired Impaired Loans | Lease Financing Receivables |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 384,684 | 358,426 |  |
Loans Excluding Acquired Impaired Loans | Pass |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 4,230,770 | 3,911,651 |  |
Loans Excluding Acquired Impaired Loans | Pass | Commercial Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 1,530,253 | 1,397,228 |  |
Loans Excluding Acquired Impaired Loans | Pass | Residential Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 423,884 | 406,948 |  |
Loans Excluding Acquired Impaired Loans | Pass | Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 316,400 | 286,434 |  |
Loans Excluding Acquired Impaired Loans | Pass | Commercial and Industrial |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 1,541,963 | 1,341,826 |  |
Loans Excluding Acquired Impaired Loans | Pass | Paycheck Protection Program |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 36,260 | 123,712 |  |
Loans Excluding Acquired Impaired Loans | Pass | Installment and Other |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 1,113 | 1,123 |  |
Loans Excluding Acquired Impaired Loans | Pass | Lease Financing Receivables |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 380,897 | 354,380 |  |
Loans Excluding Acquired Impaired Loans | Watch |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 293,955 | 353,789 |  |
Loans Excluding Acquired Impaired Loans | Watch | Commercial Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 107,164 | 123,248 |  |
Loans Excluding Acquired Impaired Loans | Watch | Residential Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 17,934 | 19,062 |  |
Loans Excluding Acquired Impaired Loans | Watch | Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 29,774 | 31,768 |  |
Loans Excluding Acquired Impaired Loans | Watch | Commercial and Industrial |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 136,986 | 177,638 |  |
Loans Excluding Acquired Impaired Loans | Watch | Paycheck Protection Program |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Watch | Installment and Other |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 80 | 81 |  |
Loans Excluding Acquired Impaired Loans | Watch | Lease Financing Receivables |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 2,017 | 1,992 |  |
Loans Excluding Acquired Impaired Loans | Special Mention |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 71,720 | 69,538 |  |
Loans Excluding Acquired Impaired Loans | Special Mention | Commercial Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 38,012 | 37,340 |  |
Loans Excluding Acquired Impaired Loans | Special Mention | Residential Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 3,624 | 3,118 |  |
Loans Excluding Acquired Impaired Loans | Special Mention | Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 5,541 | 5,885 |  |
Loans Excluding Acquired Impaired Loans | Special Mention | Commercial and Industrial |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 23,162 | 21,586 |  |
Loans Excluding Acquired Impaired Loans | Special Mention | Paycheck Protection Program |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Special Mention | Installment and Other |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Special Mention | Lease Financing Receivables |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 1,381 | 1,609 |  |
Loans Excluding Acquired Impaired Loans | Substandard |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 72,812 | 75,002 |  |
Loans Excluding Acquired Impaired Loans | Substandard | Commercial Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 36,844 | 35,772 |  |
Loans Excluding Acquired Impaired Loans | Substandard | Residential Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 1,931 | 1,985 |  |
Loans Excluding Acquired Impaired Loans | Substandard | Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Substandard | Commercial and Industrial |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 33,708 | 36,897 |  |
Loans Excluding Acquired Impaired Loans | Substandard | Paycheck Protection Program |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Substandard | Installment and Other |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Substandard | Lease Financing Receivables |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 329 | 348 |  |
Loans Excluding Acquired Impaired Loans | Doubtful |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 60 | 97 |  |
Loans Excluding Acquired Impaired Loans | Doubtful | Commercial Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Doubtful | Residential Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Doubtful | Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Doubtful | Commercial and Industrial |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Doubtful | Paycheck Protection Program |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Doubtful | Installment and Other |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Doubtful | Lease Financing Receivables |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 60 | 97 |  |
Loans Excluding Acquired Impaired Loans | Loss |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases |  | 0 |  |
Loans Excluding Acquired Impaired Loans | Loss | Commercial Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Loss | Residential Real Estate |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Loss | Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Loss | Commercial and Industrial |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Loss | Paycheck Protection Program |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Loss | Installment and Other |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases | $ 0 | 0 |  |
Loans Excluding Acquired Impaired Loans | Loss | Lease Financing Receivables |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Total loans and leases |  | $ 0 |  |

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