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Loan and Lease Receivables - Summary of Balances for Each Respective Loan and Lease Category (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Mar. 31, 2021
--- | --- | --- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | $ 4,789,068 | $ 4,537,128 |  | $ 4,454,620
Originated |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 4,393,834 | 4,094,326 |  |
Acquired Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 119,751 | 127,051 |  |
Acquired Non-Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 275,483 | 315,751 |  |
Commercial Real Estate |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 1,779,365 | 1,665,748 |  | 1,431,668
Commercial Real Estate | Originated |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 1,527,920 | 1,379,000 |  |
Commercial Real Estate | Acquired Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 67,092 | 72,160 |  |
Commercial Real Estate | Acquired Non-Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 184,353 | 214,588 |  |
Residential Real Estate |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 494,720 | 480,514 |  | 545,279
Residential Real Estate | Originated |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 399,638 | 379,796 |  |
Residential Real Estate | Acquired Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 47,347 | 49,401 |  |
Residential Real Estate | Acquired Non-Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 47,735 | 51,317 |  |
Construction, Land Development, and Other Land |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 353,072 | 325,399 |  | 240,324
Construction, Land Development, and Other Land | Originated |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 351,519 | 323,886 |  |
Construction, Land Development, and Other Land | Acquired Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 1,357 | 1,312 |  |
Construction, Land Development, and Other Land | Acquired Non-Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 196 | 201 |  |
Commercial and Industrial |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 1,739,611 | 1,581,961 |  | 1,364,396
Commercial and Industrial | Originated |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 1,698,025 | 1,534,745 |  |
Commercial and Industrial | Acquired Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 3,792 | 4,014 |  |
Commercial and Industrial | Acquired Non-Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 37,794 | 43,202 |  |
Paycheck Protection Program |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 36,260 | 123,712 |  | 617,006
Paycheck Protection Program | Originated |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 36,260 | 123,712 |  |
Paycheck Protection Program | Acquired Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Paycheck Protection Program | Acquired Non-Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 0 | 0 |  |
Installment and Other |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 1,356 | 1,368 |  | 1,616
Installment and Other | Originated |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 945 | 940 |  |
Installment and Other | Acquired Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 163 | 164 |  |
Installment and Other | Acquired Non-Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 248 | 264 |  |
Lease Financing Receivables |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | 384,684 | 358,426 | $ 384,684 | $ 254,331
Lease Financing Receivables | Originated |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases |  | 352,247 | 379,527 |
Lease Financing Receivables | Acquired Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases |  | 0 | 0 |
Lease Financing Receivables | Acquired Non-Impaired |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans and leases | $ 5,157 | $ 6,179 | $ 5,157 |

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