Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025
Common Stock [Member]
Stock grant forfeiture, shares	17,195	2,093	2,236	5,311	846	8,543
Cash dividends per share	$ 0.38	$ 0.38	$ 0.38	$ 0.37	$ 0.37	$ 0.37
Net issuance of common stock under stock-based compensation plans	56,284	15,453	311,231	1,577	578	274,556
Acquisition of Piedmont Bancorp, Inc. (7,860,831 shares)						7,860,831
Treasury Stock [Member]
Purchase of treasury stock, shares	2,108,811	1,502,220	1,758,233	735,460	981,428	582,324

Number of shares of stock issued during the period pursuant to acquisitions.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
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Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details