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Loans and Allowance for Credit Losses - Rollforward of Allowance for Credit/Loan Losses by Portfolio Segment (Detail) - USD ($) |  | 3 Months Ended
--- | --- | ---
Jan. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance |  | $ 421,162,000 | $ 261,734,000
PCD allowance for credit loss at acquisition | $ 85,299,000 |  | 62,126,000
Charge-offs |  | (21,587,000) | (36,967,000)
Recoveries |  | 2,658,000 | 1,095,000
Provision |  | 27,000,000 | 85,500,000
Ending balance - ACL |  | 429,233,000 | 373,488,000
Beginning balance - ACL on off-balance sheet |  | 5,721,000 | 4,138,000
Initial allowance for credit loss at acquisition |  |  | 3,583,000
Provision |  | 0 | 500,000
Ending balance - ACL on off-balance sheet |  | 5,721,000 | 8,221,000
Commercial and Industrial Portfolio [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance |  | 240,324,000 | 161,553,000
PCD allowance for credit loss at acquisition |  |  | 35,143,000
Charge-offs |  | (3,349,000) | (25,996,000)
Recoveries |  | 1,090,000 | 69,000
Provision |  | 14,604,000 | 21,986,000
Ending balance - ACL |  | 252,669,000 | 192,755,000
Beginning balance - ACL on off-balance sheet |  | 2,886,000 | 2,234,000
Initial allowance for credit loss at acquisition |  |  | 2,166,000
Provision |  | 979,000 | 1,135,000
Ending balance - ACL on off-balance sheet |  | 3,865,000 | 5,535,000
Commercial Real Estate Portfolio [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance |  | 151,060,000 | 77,340,000
PCD allowance for credit loss at acquisition |  |  | 26,764,000
Charge-offs |  | (10,764,000) | (2,324,000)
Recoveries |  | 3,000 |
Provision |  | 6,136,000 | 47,565,000
Ending balance - ACL |  | 146,435,000 | 149,345,000
Beginning balance - ACL on off-balance sheet |  | 2,548,000 | 1,741,000
Initial allowance for credit loss at acquisition |  |  | 1,192,000
Provision |  | (940,000) | (521,000)
Ending balance - ACL on off-balance sheet |  | 1,608,000 | 2,412,000
Consumer Real Estate Portfolio [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance |  | 6,938,000 | 4,327,000
PCD allowance for credit loss at acquisition |  |  | 206,000
Charge-offs |  | (513,000) | (1,229,000)
Recoveries |  | 19,000 | 16,000
Provision |  | (1,310,000) | 1,478,000
Ending balance - ACL |  | 5,134,000 | 4,798,000
Beginning balance - ACL on off-balance sheet |  | 154,000 | 70,000
Initial allowance for credit loss at acquisition |  |  | 63,000
Provision |  | (38,000) | 5,000
Ending balance - ACL on off-balance sheet |  | 116,000 | 138,000
Consumer Portfolio [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance |  | 1,387,000 | 966,000
PCD allowance for credit loss at acquisition |  |  | 13,000
Charge-offs |  | (1,085,000) | (742,000)
Recoveries |  | 299,000 | 119,000
Provision |  | 718,000 | 1,132,000
Ending balance - ACL |  | 1,319,000 | 1,488,000
Beginning balance - ACL on off-balance sheet |  | 91,000 | 16,000
Initial allowance for credit loss at acquisition |  |  | 41,000
Provision |  | (14,000) | 34,000
Ending balance - ACL on off-balance sheet |  | 77,000 | 91,000
Credit Cards Portfolio [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance |  | 18,042,000 | 14,272,000
Charge-offs |  | (5,876,000) | (6,676,000)
Recoveries |  | 1,227,000 | 891,000
Provision |  | 5,138,000 | 11,508,000
Ending balance - ACL |  | 18,531,000 | 19,995,000
Leases and Other Portfolio [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance |  | 1,727,000 | 631,000
Recoveries |  | 20,000 |
Provision |  | 41,000 | (90,000)
Ending balance - ACL |  | 1,788,000 | 541,000
Beginning balance - ACL on off-balance sheet |  | 27,000 | 63,000
Initial allowance for credit loss at acquisition |  |  | 114,000
Provision |  | 4,000 | (142,000)
Ending balance - ACL on off-balance sheet |  | 31,000 | 35,000
Total - Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance |  | 419,478,000 | 259,089,000
PCD allowance for credit loss at acquisition |  |  | 62,126,000
Charge-offs |  | (21,587,000) | (36,967,000)
Recoveries |  | 2,658,000 | 1,095,000
Provision |  | 25,327,000 | 83,579,000
Ending balance - ACL |  | 425,876,000 | 368,922,000
Beginning balance - ACL on off-balance sheet |  | 5,706,000 | 4,124,000
Initial allowance for credit loss at acquisition |  |  | 3,576,000
Provision |  | (9,000) | 511,000
Ending balance - ACL on off-balance sheet |  | 5,697,000 | 8,211,000
HTM [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance |  | 1,684,000 | 2,645,000
Provision |  | 1,673,000 | 1,921,000
Ending balance - ACL |  | 3,357,000 | 4,566,000
Beginning balance - ACL on off-balance sheet |  | 15,000 | 14,000
Initial allowance for credit loss at acquisition |  |  | 7,000
Provision |  | 9,000 | (11,000)
Ending balance - ACL on off-balance sheet |  | $ 24,000 | $ 10,000

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