Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS (Long-Term Borrowings) (Details)

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BORROWINGS (Long-Term Borrowings) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Trust Preferred Capital Securities $ 150,500 $ 150,500
Subordinated Debt 250,000 250,000
Fair Value Premium (Discount) (13,840) (14,134)
Investment in Trust Preferred Capital Securities 4,659 4,659
Total Long-term Borrowings $ 391,319 $ 391,025
SOFR    
Debt Instrument [Line Items]    
Basis spread on variable rate 0.262% 0.262%
Trust Preferred Capital Notes    
Debt Instrument [Line Items]    
Remaining fair value discount on acquired notes $ 11,400 $ 11,700
Statutory Trust I    
Debt Instrument [Line Items]    
Trust Preferred Capital Securities 22,500 22,500
Investment in Trust Preferred Capital Securities $ 696 $ 696
Basis spread on variable rate 2.75% 2.75%
Rate 8.31% 8.34%
Maturity date Jun. 17, 2034 Jun. 17, 2034
Statutory Trust II    
Debt Instrument [Line Items]    
Trust Preferred Capital Securities $ 36,000 $ 36,000
Investment in Trust Preferred Capital Securities $ 1,114 $ 1,114
Basis spread on variable rate 1.40% 1.40%
Rate 6.96% 6.99%
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
Investment in Trust Preferred Capital Securities $ 619 $ 619
Basis spread on variable rate 2.73% 2.73%
Rate 8.29% 8.32%
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
Investment in Trust Preferred Capital Securities $ 372 $ 372
Basis spread on variable rate 3.10% 3.10%
Rate 8.66% 8.69%
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
Investment in Trust Preferred Capital Securities $ 248 $ 248
Basis spread on variable rate 3.10% 3.10%
Rate 8.66% 8.69%
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
Investment in Trust Preferred Capital Securities $ 217 $ 217
Basis spread on variable rate 2.65% 2.65%
Rate 8.21% 8.24%
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
Investment in Trust Preferred Capital Securities $ 464 $ 464
Basis spread on variable rate 1.50% 1.50%
Rate 7.06% 7.09%
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
Investment in Trust Preferred Capital Securities $ 774 $ 774
Basis spread on variable rate 1.55% 1.55%
Rate 7.11% 7.14%
Maturity date Jul. 30, 2037 Jul. 30, 2037
MFC Capital Trust II    
Debt Instrument [Line Items]    
Trust Preferred Capital Securities $ 5,000 $ 5,000
Investment in Trust Preferred Capital Securities $ 155 $ 155
Basis spread on variable rate 2.85% 2.85%
Rate 8.41% 8.44%
Maturity date Jan. 23, 2034 Jan. 23, 2034
Subordinated Debt    
Debt Instrument [Line Items]    
Remaining fair value discount on acquired notes $ 2,400 $ 2,500
Subordinated Debt | SOFR | Scenario, Plan    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.86% 1.86%
2031 Subordinate Debt    
Debt Instrument [Line Items]    
Subordinated Debt $ 250,000 $ 250,000
Basis spread on variable rate 0.00% 0.00%
Rate 2.875% 2.875%
Maturity date Dec. 15, 2031 Dec. 15, 2031