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, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Trust Preferred Capital Securities $ 150,500 $ 150,500  
Subordinated Debt 250,000 250,000  
Fair Value Premium (Discount) (16,154) (16,435)  
Investment in Trust Preferred Capital Securities 4,659 4,659  
Total Long-term Borrowings 389,005 388,724  
Trust Preferred Capital Notes      
Debt Instrument [Line Items]      
Remaining issuance discount on debt 13,100 13,300  
Statutory Trust I      
Debt Instrument [Line Items]      
Trust Preferred Capital Securities 22,500 22,500  
Investment in Trust Preferred Capital Securities $ 696 $ 696  
Rate 3.71% 2.96%  
Maturity date Jun. 17, 2034 Jun. 17, 2034  
Statutory Trust I | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.75% 2.75%  
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  
Rate 2.36% 1.61%  
Maturity date Jun. 15, 2036 Jun. 15, 2036  
Statutory Trust II | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.40% 1.40%  
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  
Rate 3.69% 2.94%  
Maturity date Mar. 18, 2034 Mar. 18, 2034  
VFG Limited Liability Trust I Indenture | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.73% 2.73%  
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  
Rate 4.06% 3.31%  
Maturity date Jun. 26, 2033 Jun. 26, 2033  
FNB Statutory Trust II Indenture | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 3.10% 3.10%  
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  
Rate 4.06% 3.31%  
Maturity date Sep. 17, 2033 Sep. 17, 2033  
Gateway Capital Statutory Trust I | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 3.10% 3.10%  
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  
Rate 3.61% 2.86%  
Maturity date Jun. 17, 2034 Jun. 17, 2034  
Gateway Capital Statutory Trust II | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.65% 2.65%  
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  
Rate 2.46% 1.71%  
Maturity date May 30, 2036 May 30, 2036  
Gateway Capital Statutory Trust III | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.50% 1.50%  
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  
Rate 2.51% 1.76%  
Maturity date Jul. 30, 2037 Jul. 30, 2037  
Gateway Capital Statutory Trust IV | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.55% 1.55%  
MFC Capital Trust II      
Debt Instrument [Line Items]      
Trust Preferred Capital Securities $ 5,000 $ 5,000  
Investment in Trust Preferred Capital Securities $ 155 $ 155  
Rate 3.81% 3.06%  
Maturity date Jan. 23, 2034 Jan. 23, 2034  
MFC Capital Trust II | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.85% 2.85%  
Subordinated Debt      
Debt Instrument [Line Items]      
Remaining issuance discount on debt $ 3,000 $ 3,100  
Subordinated Debt | SOFR | Scenario, Plan      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.86% 1.86%  
2026 Subordinate Debt      
Debt Instrument [Line Items]      
Subordinated Debt     $ 150,000
Rate     5.00%
2031 Subordinate Debt      
Debt Instrument [Line Items]      
Subordinated Debt $ 250,000 $ 250,000  
Rate 2.875% 2.875%  
Maturity date Dec. 15, 2031 Dec. 15, 2031