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Nature of Operations and Summary of Significant Accounting Policies (Details) - USD ($)	Jan. 26, 2024	Dec. 31, 2023	Mar. 30, 2023	Dec. 31, 2022
Retained earnings, net of tax		$ 1,063,599,000		$ 832,871,000
Restricted cash		$ 36,400,000
Credit linked notes
Notes issued			$ 158,100,000
Farmers Merchants Bank Of Illinois Branches | Disposed by sale | Subsequent event
Assets	$ 50,800,000
Net gain	703,000
Deposit premium	10,100,000
Extinguishment Of Goodwill	7,800,000
Extinguishment Of Intangibles	500,000
Liabilities	230,200,000
Farmers-Merchants Bank of Illinois branch locations in Paxton, Melvin, and Piper City, Illinois | Disposed by sale | Bank of Pontiac | Subsequent event
Deposits	164,800,000
Loans	19,200,000
Farmers-Merchants Bank of Illinois branch located in Joy, Illinois | Disposed by sale | CBI Bank & Trust | Subsequent event
Deposits	65,100,000
Loans	$ 28,600,000

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