Debt Securities - Gross Unrealized Losses and Fair Value of Investments (Details) $ in Thousands	Jun. 30, 2025 USD ($) Security	Dec. 31, 2024 USD ($) Security
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale Securities, Less than 12 Months, Fair Value	$ 113,707	$ 122,213
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 1,249	$ 2,453
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included \| Security	30	35
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 652,335	$ 668,832
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 94,241	$ 117,166
Available-for-Sale Securities, 12 Months or More, Number of Securities Included \| Security	444	461
Available-for-Sale Securities, Total, Fair Value	$ 766,042	$ 791,045
Available-for-Sale Securities, Total, Unrealized Losses	95,490	119,619
U.S. Treasury and Other U.S. Government Agencies [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale Securities, Less than 12 Months, Fair Value	0	0
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 0	$ 0
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included \| Security	0	0
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 4,675	$ 4,538
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 266	$ 389
Available-for-Sale Securities, 12 Months or More, Number of Securities Included \| Security	2	2
Available-for-Sale Securities, Total, Fair Value	$ 4,675	$ 4,538
Available-for-Sale Securities, Total, Unrealized Losses	266	389
U.S. Government-sponsored Enterprises (GSEs) [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale Securities, Less than 12 Months, Fair Value	2,632	12,226
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 40	$ 258
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included \| Security	2	3
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 145,933	$ 147,828
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 15,706	$ 21,689
Available-for-Sale Securities, 12 Months or More, Number of Securities Included \| Security	63	67
Available-for-Sale Securities, Total, Fair Value	$ 148,565	$ 160,054
Available-for-Sale Securities, Total, Unrealized Losses	15,746	21,947
Mortgage-backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale Securities, Less than 12 Months, Fair Value	85,336	90,776
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 766	$ 2,043
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included \| Security	17	24
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 336,394	$ 348,035
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 52,169	$ 64,545
Available-for-Sale Securities, 12 Months or More, Number of Securities Included \| Security	212	216
Available-for-Sale Securities, Total, Fair Value	$ 421,730	$ 438,811
Available-for-Sale Securities, Total, Unrealized Losses	52,935	66,588
Asset-backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale Securities, Less than 12 Months, Fair Value	20,861	14,103
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 105	$ 75
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included \| Security	8	5
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 16,584	$ 17,170
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 512	$ 326
Available-for-Sale Securities, 12 Months or More, Number of Securities Included \| Security	7	7
Available-for-Sale Securities, Total, Fair Value	$ 37,445	$ 31,273
Available-for-Sale Securities, Total, Unrealized Losses	617	401
Corporate Bonds
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale Securities, Less than 12 Months, Fair Value		0
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses		$ 0
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included \| Security		0
Available-for-Sale Securities, 12 Months or More, Fair Value		$ 2,396
Available-for-Sale Securities, 12 Months or More, Unrealized Losses		$ 104
Available-for-Sale Securities, 12 Months or More, Number of Securities Included \| Security		1
Available-for-Sale Securities, Total, Fair Value		$ 2,396
Available-for-Sale Securities, Total, Unrealized Losses		104
Obligations of States and Political Subdivisions
Debt Securities, Available-for-Sale [Line Items]
Available-for-Sale Securities, Less than 12 Months, Fair Value	4,878	5,108
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 338	$ 77
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included \| Security	3	3
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 148,749	$ 148,865
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 25,588	$ 30,113
Available-for-Sale Securities, 12 Months or More, Number of Securities Included \| Security	160	168
Available-for-Sale Securities, Total, Fair Value	$ 153,627	$ 153,973
Available-for-Sale Securities, Total, Unrealized Losses	$ 25,926	$ 30,190

WILSON BANK HOLDING CO 10-Q