BORROWINGS (Long-Term Borrowings) (Details) - USD ($)
$ in Thousands |
3 Months Ended |
9 Months Ended |
12 Months Ended |
Sep. 30, 2026 |
Sep. 30, 2026 |
Dec. 31, 2025 |
| Debt Instrument [Line Items] |
|
|
|
| Trust Preferred Capital Securities |
$ 179,000
|
$ 179,000
|
$ 179,000
|
| Subordinated Debt |
690,000
|
690,000
|
608,000
|
| Fair Value Premium (Discount) |
(16,789)
|
(16,789)
|
(20,682)
|
| Investment in Trust Preferred Capital Securities |
5,542
|
5,542
|
5,542
|
| Total Long-term Borrowings |
857,753
|
$ 857,753
|
$ 771,860
|
| Basis spread on variable rate |
|
0.262%
|
0.262%
|
| Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |
|
us-gaap:SecuredOvernightFinancingRateSofrMember
|
us-gaap:SecuredOvernightFinancingRateSofrMember
|
| Trust Preferred Capital Notes |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Remaining fair value discount on acquired notes |
12,000
|
$ 12,000
|
$ 12,900
|
| Statutory Trust I |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Trust Preferred Capital Securities |
22,500
|
22,500
|
22,500
|
| Investment in Trust Preferred Capital Securities |
$ 696
|
$ 696
|
$ 696
|
| Basis spread on variable rate |
|
2.75%
|
2.75%
|
| Rate |
7.09%
|
7.09%
|
6.66%
|
| Maturity date |
|
Jun. 17, 2034
|
Jun. 17, 2034
|
| Statutory Trust II |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Trust Preferred Capital Securities |
$ 36,000
|
$ 36,000
|
$ 36,000
|
| Investment in Trust Preferred Capital Securities |
$ 1,114
|
$ 1,114
|
$ 1,114
|
| Basis spread on variable rate |
|
1.40%
|
1.40%
|
| Rate |
5.74%
|
5.74%
|
5.31%
|
| Maturity date |
|
Jun. 15, 2036
|
Jun. 15, 2036
|
| VFG Limited Liability Trust I Indenture |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Trust Preferred Capital Securities |
$ 20,000
|
$ 20,000
|
$ 20,000
|
| Investment in Trust Preferred Capital Securities |
$ 619
|
$ 619
|
$ 619
|
| Basis spread on variable rate |
|
2.73%
|
2.73%
|
| Rate |
7.07%
|
7.07%
|
6.64%
|
| Maturity date |
|
Mar. 18, 2034
|
Mar. 18, 2034
|
| FNB Statutory Trust II Indenture |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Trust Preferred Capital Securities |
$ 12,000
|
$ 12,000
|
$ 12,000
|
| Investment in Trust Preferred Capital Securities |
$ 372
|
$ 372
|
$ 372
|
| Basis spread on variable rate |
|
3.10%
|
3.10%
|
| Rate |
7.44%
|
7.44%
|
7.01%
|
| Maturity date |
|
Jun. 26, 2033
|
Jun. 26, 2033
|
| Gateway Capital Statutory Trust I |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Trust Preferred Capital Securities |
$ 8,000
|
$ 8,000
|
$ 8,000
|
| Investment in Trust Preferred Capital Securities |
$ 248
|
$ 248
|
$ 248
|
| Basis spread on variable rate |
|
3.10%
|
3.10%
|
| Rate |
7.44%
|
7.44%
|
7.01%
|
| Maturity date |
|
Sep. 17, 2033
|
Sep. 17, 2033
|
| Gateway Capital Statutory Trust II |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Trust Preferred Capital Securities |
$ 7,000
|
$ 7,000
|
$ 7,000
|
| Investment in Trust Preferred Capital Securities |
$ 217
|
$ 217
|
$ 217
|
| Basis spread on variable rate |
|
2.65%
|
2.65%
|
| Rate |
6.99%
|
6.99%
|
6.56%
|
| Maturity date |
|
Jun. 17, 2034
|
Jun. 17, 2034
|
| Gateway Capital Statutory Trust III |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Trust Preferred Capital Securities |
$ 15,000
|
$ 15,000
|
$ 15,000
|
| Investment in Trust Preferred Capital Securities |
$ 464
|
$ 464
|
$ 464
|
| Basis spread on variable rate |
|
1.50%
|
1.50%
|
| Rate |
5.84%
|
5.84%
|
5.41%
|
| Maturity date |
|
May 30, 2036
|
May 30, 2036
|
| Gateway Capital Statutory Trust IV |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Trust Preferred Capital Securities |
$ 25,000
|
$ 25,000
|
$ 25,000
|
| Investment in Trust Preferred Capital Securities |
$ 774
|
$ 774
|
$ 774
|
| Basis spread on variable rate |
|
1.55%
|
1.55%
|
| Rate |
5.89%
|
5.89%
|
5.46%
|
| Maturity date |
|
Jul. 30, 2037
|
Jul. 30, 2037
|
| MFC Capital Trust II |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Trust Preferred Capital Securities |
$ 5,000
|
$ 5,000
|
$ 5,000
|
| Investment in Trust Preferred Capital Securities |
$ 155
|
$ 155
|
$ 155
|
| Basis spread on variable rate |
|
2.85%
|
2.85%
|
| Rate |
7.19%
|
7.19%
|
6.76%
|
| Maturity date |
|
Jan. 23, 2034
|
Jan. 23, 2034
|
| AMNB Trust I | American National |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Trust Preferred Capital Securities |
$ 20,000
|
$ 20,000
|
$ 20,000
|
| Investment in Trust Preferred Capital Securities |
$ 619
|
$ 619
|
$ 619
|
| Basis spread on variable rate |
|
1.35%
|
1.35%
|
| Rate |
5.69%
|
5.69%
|
5.26%
|
| Maturity date |
|
Jun. 30, 2036
|
Jun. 30, 2036
|
| MidCarolina Trust I | American National |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Trust Preferred Capital Securities |
$ 5,000
|
$ 5,000
|
$ 5,000
|
| Investment in Trust Preferred Capital Securities |
$ 155
|
$ 155
|
$ 155
|
| Basis spread on variable rate |
|
3.45%
|
3.45%
|
| Rate |
7.53%
|
7.53%
|
7.10%
|
| Maturity date |
|
Nov. 07, 2032
|
Nov. 07, 2032
|
| MidCarolina Trust II | American National |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Trust Preferred Capital Securities |
$ 3,500
|
$ 3,500
|
$ 3,500
|
| Investment in Trust Preferred Capital Securities |
$ 109
|
$ 109
|
$ 109
|
| Basis spread on variable rate |
|
2.95%
|
2.95%
|
| Rate |
7.03%
|
7.03%
|
6.60%
|
| Maturity date |
|
Jan. 07, 2034
|
Jan. 07, 2034
|
| Subordinated Debt [Member] |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Remaining fair value discount on acquired notes |
$ 4,800
|
$ 4,800
|
$ 7,800
|
| Subordinated Debt [Member] | Scenario, Plan [Member] |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Basis spread on variable rate |
|
1.86%
|
1.86%
|
| 2031 Subordinate Notes |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Subordinated Debt |
$ 250,000
|
$ 250,000
|
$ 250,000
|
| Basis spread on variable rate |
|
0.00%
|
0.00%
|
| Rate |
2.88%
|
2.88%
|
2.88%
|
| Maturity date |
|
Dec. 15, 2031
|
Dec. 15, 2031
|
| 2032 Subordinate Notes | Sandy Spring |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Subordinated Debt |
$ 190,000
|
$ 190,000
|
$ 190,000
|
| Basis spread on variable rate |
|
0.00%
|
0.00%
|
| Rate |
3.88%
|
3.88%
|
3.88%
|
| Maturity date |
|
Mar. 30, 2032
|
Mar. 30, 2032
|
| 2032 Subordinate Notes | Scenario, Plan [Member] | Sandy Spring |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Basis spread on variable rate |
|
1.965%
|
1.965%
|
| 2036 Subordinated Notes |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Subordinated Debt |
$ 250,000
|
$ 250,000
|
|
| Basis spread on variable rate |
2.13%
|
0.00%
|
|
| Rate |
6.25%
|
6.25%
|
|
| Maturity date |
|
Aug. 01, 2036
|
|
| 2029 Subordinated Notes | Sandy Spring |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Subordinated Debt |
$ 168,000
|
$ 168,000
|
$ 168,000
|
| Basis spread on variable rate |
|
|
2.62%
|
| Rate |
6.53%
|
6.53%
|
6.53%
|
| Maturity date |
|
|
Nov. 15, 2029
|
| 2029 Subordinated Notes | Scenario, Plan [Member] | Sandy Spring |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Basis spread on variable rate |
|
2.13%
|
2.62%
|
| Spread adjustment |
|
|
0.26%
|