Loans and Allowance for Credit Losses - Summary of Amortized Cost of Loans Designated as TLMs (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) Loan	Dec. 31, 2024 USD ($) Loan
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	6	9
Number of Loans, Interest forgiveness \| Loan	1	5
Amortized Cost	$ 2,428	$ 1,784
Term extension and Forbearance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	0	1
Amortized Cost	$ 0	$ 82
Term Extension, Deferral and Interest Rate Reduction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	0	2
Amortized Cost	$ 0	$ 407
Interest Forgiven [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	1	0
Number of Loans, Interest forgiveness \| Loan	1	0
Amortized Cost	$ 136	$ 0
Amortized Cost, Interest forgiveness	$ 136	$ 0
Extended Maturity [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	5	4
Amortized Cost	$ 2,292	$ 629
Payment Deferral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	0	2
Amortized Cost	$ 0	$ 666
Payment Deferral	$ 0	$ 347
Commercial and Industrial [Member] \| Term extension and Forbearance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	0	1
Amortized Cost	$ 0	$ 82
% of Amortized Cost to Gross Loans by Category	0.00%	0.02%
Commercial and Industrial [Member] \| Term Extension, Deferral and Interest Rate Reduction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	0	2
Amortized Cost	$ 0	$ 407
% of Amortized Cost to Gross Loans by Category	0.00%	0.11%
Commercial and Industrial [Member] \| Extended Maturity [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	1	2
Amortized Cost	$ 1,774	$ 521
% of Amortized Cost to Gross Loans by Category	0.65%	0.15%
Commercial and Industrial [Member] \| Payment Deferral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	0	1
Amortized Cost	$ 0	$ 156
Payment Deferral	$ 0	$ 347
% of Amortized Cost to Gross Loans by Category	0.00%	0.04%
Commercial [Member] \| Extended Maturity [Member] \| Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	3	1
Amortized Cost	$ 468	$ 37
% of Amortized Cost to Gross Loans by Category	0.06%	0.00%
Residential [Member] \| Interest Forgiven [Member] \| Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	1	0
Number of Loans, Interest forgiveness \| Loan	1	0
Amortized Cost	$ 136	$ 0
Amortized Cost, Interest forgiveness	$ 136	$ 0
% of Amortized Cost to Gross Loans by Category	0.02%	0.00%
Residential [Member] \| Extended Maturity [Member] \| Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	1	1
Amortized Cost	$ 50	$ 71
% of Amortized Cost to Gross Loans by Category	0.00%	0.01%
Residential [Member] \| Payment Deferral [Member] \| Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	0	1
Amortized Cost	$ 0	$ 500
% of Amortized Cost to Gross Loans by Category	0.00%	0.07%
Consumer [Member] \| Payment Deferral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan		1
Amortized Cost	$ 0	$ 10
% of Amortized Cost to Gross Loans by Category	0.00%	0.02%