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Loan and Lease Receivables - Schedule of Unpaid Principal Balance and Carrying Value for Acquired Non-impaired Loans and Leases (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Mar. 31, 2021
--- | --- | --- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans And Leases Receivables, Gross | $ 4,789,068 | $ 4,537,128 |  | $ 4,454,620
Acquired Non-impaired Loans and Leases |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Unpaid Principal Balance | 281,841 | 322,680 |  |
Loans And Leases Receivables, Gross | 275,483 | 315,751 |  |
Commercial Real Estate |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans And Leases Receivables, Gross | 1,779,365 | 1,665,748 |  | 1,431,668
Commercial Real Estate | Acquired Non-impaired Loans and Leases |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Unpaid Principal Balance | 188,627 | 219,277 |  |
Loans And Leases Receivables, Gross | 184,353 | 214,588 |  |
Residential Real Estate |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans And Leases Receivables, Gross | 494,720 | 480,514 |  | 545,279
Residential Real Estate | Acquired Non-impaired Loans and Leases |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Unpaid Principal Balance | 48,211 | 51,839 |  |
Loans And Leases Receivables, Gross | 47,735 | 51,317 |  |
Construction, Land Development, and Other Land |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans And Leases Receivables, Gross | 353,072 | 325,399 |  | 240,324
Construction, Land Development, and Other Land | Acquired Non-impaired Loans and Leases |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Unpaid Principal Balance | 260 | 265 |  |
Loans And Leases Receivables, Gross | 196 | 201 |  |
Commercial and Industrial |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans And Leases Receivables, Gross | 1,739,611 | 1,581,961 |  | 1,364,396
Commercial and Industrial | Acquired Non-impaired Loans and Leases |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Unpaid Principal Balance | 39,314 | 44,827 |  |
Loans And Leases Receivables, Gross | 37,794 | 43,202 |  |
Installment and Other |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans And Leases Receivables, Gross | 1,356 | 1,368 |  | 1,616
Installment and Other | Acquired Non-impaired Loans and Leases |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Unpaid Principal Balance | 257 | 273 |  |
Loans And Leases Receivables, Gross | 248 | 264 |  |
Lease Financing Receivables |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans And Leases Receivables, Gross | 384,684 | 358,426 | $ 384,684 | $ 254,331
Lease Financing Receivables | Acquired Non-impaired Loans and Leases |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Unpaid Principal Balance | 5,172 | 6,199 |  |
Loans And Leases Receivables, Gross | $ 5,157 | $ 6,179 | $ 5,157 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 + Details
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