INVESTMENT SECURITIES - Reconciliation of investment securities available for sale (Details) - USD ($)	Jun. 30, 2026	Dec. 31, 2025
INVESTMENT SECURITIES
Amortized Cost	$ 8,794,555	$ 9,095,188
Gross Unrealized Gains	11,792	19,396
Gross Unrealized Losses	(438,422)	(427,909)
Estimated Fair Value	8,367,925	8,686,675
Allowance for credit losses	0	0
U.S. government and agency securities
INVESTMENT SECURITIES
Amortized Cost	1,071,037	1,089,563
Gross Unrealized Losses	(64,955)	(56,630)
Estimated Fair Value	1,006,082	1,032,933
Obligations of states and political subdivisions
INVESTMENT SECURITIES
Amortized Cost	2,878,309	2,889,318
Gross Unrealized Gains	5,254	7,002
Gross Unrealized Losses	(75,582)	(77,788)
Estimated Fair Value	2,807,981	2,818,532
Mortgage-backed securities
INVESTMENT SECURITIES
Amortized Cost	4,845,209	5,116,307
Gross Unrealized Gains	6,538	12,394
Gross Unrealized Losses	(297,885)	(293,491)
Estimated Fair Value	$ 4,553,862	$ 4,835,210

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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