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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