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Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Allowance for Loan and Lease Losses and Corresponding Loan and Lease Balances (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Sep. 30, 2021
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning balance | $ (55,012) | $ (66,347) |  |
Provisions (recapture) | 4,995 | 4,367 |  |
Charge-offs | (1,066) | (5,466) |  |
Recoveries | 517 | 342 |  |
Ending balance | 59,458 | 65,590 |  |
Individually evaluated for impairment | 20,739 | 26,334 |  |
Collectively evaluated for impairment | 35,673 | 35,101 |  |
Loans acquired with deteriorated credit quality | 3,046 | 4,155 |  |
Allowance for loan and lease losses | 59,458 | 65,590 | $ 55,012 |
Individually evaluated for impairment | 71,452 | 99,436 |  |
Collectively evaluated for impairment | 4,597,865 | 4,173,817 |  |
Total loans and leases | 4,789,068 | 4,454,620 | 4,537,128 |
Loans Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loans acquired with deteriorated credit quality | 119,751 | 181,367 |  |
Commercial Real Estate |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning balance | (16,918) | (19,584) |  |
Provisions (recapture) | 2,784 | 2,606 |  |
Charge-offs | (240) | (1,877) |  |
Recoveries | 244 | 185 |  |
Ending balance | 19,706 | 20,498 |  |
Individually evaluated for impairment | 7,731 | 7,409 |  |
Collectively evaluated for impairment | 10,320 | 10,881 |  |
Loans acquired with deteriorated credit quality | 1,655 | 2,208 |  |
Allowance for loan and lease losses | 19,706 | 20,498 | 16,918 |
Individually evaluated for impairment | 36,805 | 54,421 |  |
Collectively evaluated for impairment | 1,675,468 | 1,281,188 |  |
Total loans and leases | 1,779,365 | 1,431,668 | 1,665,748 |
Commercial Real Estate | Loans Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loans acquired with deteriorated credit quality | 67,092 | 96,059 |  |
Residential Real Estate |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning balance | 1,628 | 2,400 |  |
Provisions (recapture) | 513 | (302) |  |
Charge-offs | 0 | (11) |  |
Recoveries | 4 | 4 |  |
Ending balance | 2,145 | 2,091 |  |
Individually evaluated for impairment | 6 | 101 |  |
Collectively evaluated for impairment | 1,138 | 1,460 |  |
Loans acquired with deteriorated credit quality | 1,001 | 530 |  |
Allowance for loan and lease losses | 2,145 | 2,091 | (1,628) |
Individually evaluated for impairment | 2,190 | 1,709 |  |
Collectively evaluated for impairment | 445,183 | 469,287 |  |
Total loans and leases | 494,720 | 545,279 | 480,514 |
Residential Real Estate | Loans Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loans acquired with deteriorated credit quality | 47,347 | 74,283 |  |
Construction, Land Development, and Other Land |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning balance | (522) | (1,352) |  |
Provisions (recapture) | 594 | (241) |  |
Charge-offs | 0 | (326) |  |
Recoveries | 0 | 0 |  |
Ending balance | 1,116 | 785 |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 1,115 | 780 |  |
Loans acquired with deteriorated credit quality | 1 | 5 |  |
Allowance for loan and lease losses | 1,116 | 785 | 522 |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 351,715 | 238,332 |  |
Total loans and leases | 353,072 | 240,324 | 325,399 |
Construction, Land Development, and Other Land | Loans Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loans acquired with deteriorated credit quality | 1,357 | 1,992 |  |
Commercial and Industrial |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning balance | (33,129) | (41,183) |  |
Provisions (recapture) | (458) | 1,947 |  |
Charge-offs | 463 | 2,888 |  |
Recoveries | 120 | 60 |  |
Ending balance | 33,244 | 40,302 |  |
Individually evaluated for impairment | 13,002 | 18,824 |  |
Collectively evaluated for impairment | 19,855 | 20,066 |  |
Loans acquired with deteriorated credit quality | 387 | 1,412 |  |
Allowance for loan and lease losses | 33,244 | 40,302 | 33,129 |
Individually evaluated for impairment | 32,457 | 43,306 |  |
Collectively evaluated for impairment | 1,703,362 | 1,312,248 |  |
Total loans and leases | 1,739,611 | 1,364,396 | 1,581,961 |
Commercial and Industrial | Loans Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loans acquired with deteriorated credit quality | 3,792 | 8,842 |  |
Paycheck Protection Program |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning balance | 0 | 0 |  |
Provisions (recapture) | 0 | 0 |  |
Charge-offs | 0 | 0 |  |
Recoveries | 0 | 0 |  |
Ending balance | 0 | 0 |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 0 | 0 |  |
Loans acquired with deteriorated credit quality |  | 0 |  |
Allowance for loan and lease losses | 0 | 0 | 0 |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 36,260 | 617,006 |  |
Loans acquired with deteriorated credit quality | 0 |  |  |
Total loans and leases | 36,260 | 617,006 | 123,712 |
Paycheck Protection Program | Loans Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loans acquired with deteriorated credit quality | 0 | 0 |  |
Installment and Other |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning balance | (9) | (15) |  |
Provisions (recapture) | (1) | (3) |  |
Charge-offs | 0 | 0 |  |
Recoveries | 0 | 0 |  |
Ending balance | 10 | 12 |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 8 | 12 |  |
Loans acquired with deteriorated credit quality | 2 | 0 |  |
Allowance for loan and lease losses | 10 | 12 | 9 |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 1,193 | 1,425 |  |
Total loans and leases | 1,356 | 1,616 | 1,368 |
Installment and Other | Loans Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loans acquired with deteriorated credit quality | 163 | 191 |  |
Lease Financing Receivables |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning balance | (2,806) | (1,813) |  |
Provisions (recapture) | 645 | 360 |  |
Charge-offs | (363) | (364) |  |
Recoveries | 149 | 93 |  |
Ending balance | 3,237 | 1,902 |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 3,237 | 1,902 |  |
Loans acquired with deteriorated credit quality | 0 | 0 |  |
Allowance for loan and lease losses | 3,237 | 1,902 | 2,806 |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 384,684 | 254,331 |  |
Total loans and leases | 384,684 | 254,331 | $ 358,426 | $ 384,684
Lease Financing Receivables | Loans Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loans acquired with deteriorated credit quality | $ 0 | $ 0 |  |

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