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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