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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, 2025 | Mar. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | $ 70,147 |
Ending balance | 70,597 |
Non-PCI Loans and Leases |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 70,147 | $ 69,462
Charge-offs | (3,189) | (2,123)
Recoveries | 1,243 | 527
Credit loss expense (recovery) | 2,396 | 404
Ending balance | 70,597 | 68,270
Real Estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 45,099 |
Ending balance | 51,303 |
Real Estate | Non-PCI Loans and Leases |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 45,099 | 45,499
Charge-offs | (169) |
Recoveries | 424 | 46
Credit loss expense (recovery) | 5,948 | (2,961)
Ending balance | 51,302 | 42,584
Commercial and Industrial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 10,006 |
Ending balance | 6,242 |
Commercial and Industrial | Non-PCI Loans and Leases |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 10,006 | 10,257
Charge-offs | (222) | (155)
Recoveries | 36 | 58
Credit loss expense (recovery) | (3,578) | 1,676
Ending balance | 6,242 | 11,836
Equipment Financing Agreements |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 15,042 |
Ending balance | 13,052 |
Equipment Financing Agreements | Non-PCI Loans and Leases |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 15,042 | 13,706
Charge-offs | (2,798) | (1,968)
Recoveries | 783 | 423
Credit loss expense (recovery) | 26 | 1,689
Ending balance | $ 13,053 | $ 13,850

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