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Loans - Allowance for Credit Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | $ 69,462 |
Ending balance | 68,270 |
Non-PCI Loans and Leases |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 69,462 | $ 71,523
Chargeoffs | (2,123) | (2,238)
Recoveries | 527 | 783
Credit loss expense (recovery) | 404 | 2,181
Ending balance | 68,270 | 72,249
Real Estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 45,499 |
Ending balance | 42,584 |
Real Estate | Non-PCI Loans and Leases |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 45,499 | 44,026
Chargeoffs |  | (412)
Recoveries | 46 | 68
Credit loss expense (recovery) | (2,961) | (151)
Ending balance | 42,584 | 43,531
Commercial and Industrial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 10,257 |
Ending balance | 11,836 |
Commercial and Industrial | Non-PCI Loans and Leases |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 10,257 | 15,267
Chargeoffs | (155) | (210)
Recoveries | 58 | 235
Credit loss expense (recovery) | 1,676 | 41
Ending balance | 11,836 | 15,333
Equipment Financing Agreements |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 13,706 |
Ending balance | 13,850 |
Equipment Financing Agreements | Non-PCI Loans and Leases |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 13,706 | 12,230
Chargeoffs | (1,968) | (1,616)
Recoveries | 423 | 480
Credit loss expense (recovery) | 1,689 | 2,291
Ending balance | $ 13,850 | $ 13,385

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