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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 | 9 Months Ended
--- | --- | --- | ---
Jan. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance |  | $ 394,193,000 | $ 242,123,000 | $ 261,734,000 | $ 222,996,000
PCD allowance for credit loss at acquisition | $ 85,299,000 | 8,006,000 |  | 85,299,000 |
Charge-offs |  | (19,577,000) | (9,237,000) | (73,439,000) | (18,572,000)
Recoveries |  | 1,194,000 | 783,000 | 3,722,000 | 4,245,000
Provision |  | 23,000,000 | 18,000,000 | 129,500,000 | 43,000,000
Ending balance - ACL |  | 406,816,000 | 251,669,000 | 406,816,000 | 251,669,000
Beginning balance - ACL on off-balance sheet |  | 8,221,000 | 4,138,000 | 4,138,000 | 5,088,000
Initial allowance for credit loss at acquisition |  |  |  | 3,583,000 |
Provision |  | (500,000) | 0 | 0 | (950,000)
Ending balance - ACL on off-balance sheet |  | 7,721,000 | 4,138,000 | 7,721,000 | 4,138,000
Commercial and Industrial Portfolio [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance |  | 210,728,000 | 151,448,000 | 161,553,000 | 157,389,000
PCD allowance for credit loss at acquisition |  |  |  | 45,026,000 |
Charge-offs |  | (5,927,000) | (892,000) | (38,035,000) | (1,886,000)
Recoveries |  | 65,000 | 219,000 | 254,000 | 1,837,000
Provision |  | 18,402,000 | 7,387,000 | 54,470,000 | 822,000
Ending balance - ACL |  | 223,268,000 | 158,162,000 | 223,268,000 | 158,162,000
Beginning balance - ACL on off-balance sheet |  | 4,331,000 | 2,288,000 | 2,234,000 | 4,152,000
Initial allowance for credit loss at acquisition |  |  |  | 2,166,000 |
Provision |  | (169,000) | 252,000 | (238,000) | (1,612,000)
Ending balance - ACL on off-balance sheet |  | 4,162,000 | 2,540,000 | 4,162,000 | 2,540,000
Specialty Lending Portfolio [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Recoveries |  |  | 1,000 |  | 3,000
Provision |  |  | (1,000) |  | (3,000)
Beginning balance - ACL on off-balance sheet |  |  |  |  | 186,000
Provision |  |  |  |  | (186,000)
Commercial Real Estate Portfolio [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance |  | 153,489,000 | 68,862,000 | 77,340,000 | 45,507,000
PCD allowance for credit loss at acquisition |  | 8,006,000 |  | 40,054,000 |
Charge-offs |  | (4,572,000) |  | (11,074,000) | (250,000)
Recoveries |  |  |  | 184,000 |
Provision |  | (1,230,000) | 3,238,000 | 49,189,000 | 26,843,000
Ending balance - ACL |  | 155,693,000 | 72,100,000 | 155,693,000 | 72,100,000
Beginning balance - ACL on off-balance sheet |  | 3,540,000 | 1,681,000 | 1,741,000 | 460,000
Initial allowance for credit loss at acquisition |  |  |  | 1,192,000 |
Provision |  | (420,000) | (235,000) | 187,000 | 986,000
Ending balance - ACL on off-balance sheet |  | 3,120,000 | 1,446,000 | 3,120,000 | 1,446,000
Consumer Real Estate Portfolio [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance |  | 5,521,000 | 3,567,000 | 4,327,000 | 6,941,000
PCD allowance for credit loss at acquisition |  |  |  | 206,000 |
Charge-offs |  | (421,000) | (132,000) | (2,050,000) | (308,000)
Recoveries |  | 75,000 | 22,000 | 238,000 | 632,000
Provision |  | 914,000 | 287,000 | 3,368,000 | (3,521,000)
Ending balance - ACL |  | 6,089,000 | 3,744,000 | 6,089,000 | 3,744,000
Beginning balance - ACL on off-balance sheet |  | 180,000 | 80,000 | 70,000 | 117,000
Initial allowance for credit loss at acquisition |  |  |  | 63,000 |
Provision |  | 46,000 | 5,000 | 93,000 | (32,000)
Ending balance - ACL on off-balance sheet |  | 226,000 | 85,000 | 226,000 | 85,000
Consumer Portfolio [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance |  | 1,567,000 | 632,000 | 966,000 | 1,089,000
PCD allowance for credit loss at acquisition |  |  |  | 13,000 |
Charge-offs |  | (830,000) | (357,000) | (2,253,000) | (1,026,000)
Recoveries |  | 175,000 | 40,000 | 420,000 | 138,000
Provision |  | 247,000 | 188,000 | 2,013,000 | 302,000
Ending balance - ACL |  | 1,159,000 | 503,000 | 1,159,000 | 503,000
Beginning balance - ACL on off-balance sheet |  | 98,000 | 13,000 | 16,000 | 9,000
Initial allowance for credit loss at acquisition |  |  |  | 41,000 |
Provision |  | 30,000 | 3,000 | 71,000 | 7,000
Ending balance - ACL on off-balance sheet |  | 128,000 | 16,000 | 128,000 | 16,000
Credit Cards Portfolio [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance |  | 17,913,000 | 13,936,000 | 14,272,000 | 7,935,000
Charge-offs |  | (7,820,000) | (7,852,000) | (20,020,000) | (15,098,000)
Recoveries |  | 873,000 | 498,000 | 2,620,000 | 1,632,000
Provision |  | 7,098,000 | 7,106,000 | 21,192,000 | 19,219,000
Ending balance - ACL |  | 18,064,000 | 13,688,000 | 18,064,000 | 13,688,000
Leases and Other Portfolio [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance |  | 700,000 | 722,000 | 631,000 | 877,000
Charge-offs |  | (7,000) | (4,000) | (7,000) | (4,000)
Recoveries |  | 6,000 | 3,000 | 6,000 | 3,000
Provision |  | (1,000) | (11,000) | 68,000 | (166,000)
Ending balance - ACL |  | 698,000 | 710,000 | 698,000 | 710,000
Beginning balance - ACL on off-balance sheet |  | 54,000 | 32,000 | 63,000 | 100,000
Initial allowance for credit loss at acquisition |  |  |  | 114,000 |
Provision |  | (5,000) | 1,000 | (128,000) | (69,000)
Ending balance - ACL on off-balance sheet |  | 49,000 | 31,000 | 49,000 | 31,000
Total - Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance |  | 389,918,000 | 239,167,000 | 259,089,000 | 219,738,000
PCD allowance for credit loss at acquisition |  | 8,006,000 |  | 85,299,000 |
Charge-offs |  | (19,577,000) | (9,237,000) | (73,439,000) | (18,572,000)
Recoveries |  | 1,194,000 | 783,000 | 3,722,000 | 4,245,000
Provision |  | 25,430,000 | 18,194,000 | 130,300,000 | 43,496,000
Ending balance - ACL |  | 404,971,000 | 248,907,000 | 404,971,000 | 248,907,000
Beginning balance - ACL on off-balance sheet |  | 8,203,000 | 4,094,000 | 4,124,000 | 5,024,000
Initial allowance for credit loss at acquisition |  |  |  | 3,576,000 |
Provision |  | (518,000) | 24,000 | (15,000) | (906,000)
Ending balance - ACL on off-balance sheet |  | 7,685,000 | 4,118,000 | 7,685,000 | 4,118,000
HTM [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance |  | 4,275,000 | 2,956,000 | 2,645,000 | 3,258,000
Provision |  | (2,430,000) | (194,000) | (800,000) | (496,000)
Ending balance - ACL |  | 1,845,000 | 2,762,000 | 1,845,000 | 2,762,000
Beginning balance - ACL on off-balance sheet |  | 18,000 | 44,000 | 14,000 | 64,000
Initial allowance for credit loss at acquisition |  |  |  | 7,000 |
Provision |  | 18,000 | (24,000) | 15,000 | (44,000)
Ending balance - ACL on off-balance sheet |  | $ 36,000 | $ 20,000 | $ 36,000 | $ 20,000

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