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Loans - Allowance for Credit Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance |  |  | $ 70,147 |
Ending balance | $ 69,781 |  | 69,781 |
Non-PCI Loans and Leases |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | 66,756 | $ 67,729 | 70,147 | $ 69,462
Charge-offs | (2,625) | (3,800) | (18,192) | (8,262)
Recoveries | 3,107 | 2,924 | 5,363 | 3,999
Credit loss expense (recovery) | 2,543 | 2,310 | 12,463 | 3,964
Ending balance | 69,781 | 69,163 | 69,781 | 69,163
Real Estate |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance |  |  | 45,099 |
Ending balance | 51,473 |  | 51,473 |
Real Estate | Non-PCI Loans and Leases |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | 48,021 | 42,152 | 45,099 | 45,499
Charge-offs | (119) | (1,133) | (8,904) | (1,226)
Recoveries | 52 | 729 | 670 | 840
Credit loss expense (recovery) | 3,519 | 1,946 | 14,608 | (1,419)
Ending balance | 51,473 | 43,694 | 51,473 | 43,694
Commercial and Industrial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance |  |  | 10,006 |
Ending balance | 7,302 |  | 7,302 |
Commercial and Industrial | Non-PCI Loans and Leases |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | 6,935 | 10,563 | 10,006 | 10,257
Charge-offs | (124) | (190) | (1,157) | (438)
Recoveries | 2,229 | 1,679 | 2,463 | 1,903
Credit loss expense (recovery) | (1,738) | (2,269) | (4,010) | (1,939)
Ending balance | 7,302 | 9,783 | 7,302 | 9,783
Equipment Financing Agreements |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance |  |  | 15,042 |
Ending balance | 11,006 |  | 11,006 |
Equipment Financing Agreements | Non-PCI Loans and Leases |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | 11,800 | 15,014 | 15,042 | 13,706
Charge-offs | (2,382) | (2,477) | (8,131) | (6,598)
Recoveries | 826 | 516 | 2,230 | 1,256
Credit loss expense (recovery) | 762 | 2,633 | 1,865 | 7,322
Ending balance | $ 11,006 | $ 15,686 | $ 11,006 | $ 15,686

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