Fair Value - Summary of Assets Measured at Fair Value on Non-recurring Basis (Detail) - Assets Measured at Fair Value on a Non-recurring Basis [Member] - Level 3 [Member] - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Loans Individually Evaluated for Credit Losses [Member] | Commercial Real Estate [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	$ 2,766	$ 1,616
Loans Individually Evaluated for Credit Losses [Member] | Commercial and Industrial [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	4,619	3,706
Loans Individually Evaluated for Credit Losses [Member] | Residential Real Estate [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	3,611	6,165
Loans Individually Evaluated for Credit Losses [Member] | Agricultural Real Estate [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	2,703	2,606
Loans Individually Evaluated for Credit Losses [Member] | Other [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	1,204	2,442
Other Real Estate Owned [Member] | Commercial Real Estate [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	1,061	1,061
Other Real Estate Owned [Member] | Residential Real Estate [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	$ 57	$ 170