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Note 11 - Borrowings - (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Mar. 12, 2023
Mar. 01, 2022
Nov. 03, 2021
Apr. 01, 2021
Mar. 26, 2021
May 01, 2020
Dec. 31, 2018
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2023
Advances from Federal Home Loan Banks, Net of Unaccreted Market Value Adjustment               $ 211,200,000 $ 410,100,000    
Advance from Federal Home Loan Bank               211,198,000 410,100,000    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged               1,800,000,000      
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds               1,200,000,000      
Subordinated Debt, Ending Balance               99,990,000 110,749,000    
Trust Preferred Securities           $ 5,000,000   5,000,000 5,000,000    
Gain (Loss) on Extinguishment of Debt               1,458,000 0 $ 0  
Junior Subordinated Debt [Member] | LIBOR [Member]                      
Debt Instrument, Basis Spread on Variable Rate           3.05%          
Federal Funds Purchased [Member]                      
Line of Credit Facility, Current Borrowing Capacity               145,000,000 154,000,000    
Long-Term Line of Credit, Total               0 14,100,000    
FNBB Line of Credit [Member]                      
Long-Term Line of Credit, Total                   $ 0  
Line of Credit Facility, Maximum Borrowing Capacity     $ 5,000,000                
Debt Instrument, Prime Rate Floor     3.50%                
November 2026 [Member]                      
Federal Home Loan Bank, Advances, Principal Amount               60,000,000      
Advance from Federal Home Loan Bank               $ 35,300,000 $ 47,200,000    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate               0.89% 0.89%    
April 2025 [Member]                      
Advance from Federal Home Loan Bank               $ 875,000 $ 875,000    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate               4.88% 4.88%    
July 2025 [Member]                      
Advance from Federal Home Loan Bank               $ 25,000,000      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate               4.89%      
January 2026 [Member]                      
Advance from Federal Home Loan Bank               $ 25,000,000      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate               4.65%      
July 2026 [Member]                      
Advance from Federal Home Loan Bank               $ 25,000,000      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate               4.56%      
October 2028 [Member]                      
Advance from Federal Home Loan Bank               $ 25,000,000      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate               4.13%      
October 2030 [Member]                      
Advance from Federal Home Loan Bank               $ 25,000,000      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate               3.92%      
First October 2033 [Member]                      
Advance from Federal Home Loan Bank               $ 25,000,000      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate               3.72%      
Second October 2033 [Member]                      
Advance from Federal Home Loan Bank               $ 25,000,000      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate               3.57%      
October 2023 [Member]                      
Advance from Federal Home Loan Bank                 $ 100,000,000    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate                 3.53%    
January 2023 [Member]                      
Debt Instrument, Term (Day)                 7 days    
Short-Term Federal Home Loan Bank Advances                 $ 262,000,000    
Federal Home Loan Bank, Advances, Short-term, Interest Rate                 4.55%    
First Overnight Fixed Rate Loan Due April 2023 [Member]                      
Short-Term Federal Home Loan Bank Advances                     $ 230,000,000
Bank Term Funding Program [Member]                      
Short-Term Debt               $ 300,000,000      
Debt Instrument, Interest Rate, Stated Percentage 4.38%                    
Bank Term Funding Program [Member] | Maximum [Member]                      
Debt Instrument, Term (Day) 1 year                    
Subordinated Notes with Interest Rate of 6.75% [Member]                      
Subordinated Debt, Ending Balance             $ 25,000,000 25,000,000 $ 25,000,000    
Subordinated Borrowing, Interest Rate             6.75%        
Subordinated Notes with Interest Rate of 4.25% [Member]                      
Debt Instrument, Interest Rate, Stated Percentage         4.25%            
Debt Instrument, Face Amount         $ 52,500,000            
Subordinated Notes with Interest Rate of 4.25% [Member] | Base Rate [Member]                      
Debt Instrument, Basis Spread on Variable Rate         3.54%            
Debt Issued in Connection with the SSW Acquisition [Member] | Subordinated Debt [Member]                      
Debt Instrument, Interest Rate, Stated Percentage       4.75%              
Debt Instrument, Face Amount       $ 3,900,000              
Debt Issued in Connection with the SSW Acquisition [Member] | Subordinated Debt [Member] | Base Rate [Member]                      
Debt Instrument, Basis Spread on Variable Rate       4.42%              
Debt Issued in Connection with the TCBI Acquisition [Member]                      
Debt Instrument, Face Amount   $ 26,400,000                  
Gain (Loss) on Extinguishment of Debt               1,500,000      
Liabilities, Fair Value Adjustment               $ 1,100,000 $ 2,900,000    
Debt Issued in Connection with the TCBI Acquisition, Tranche One [Member]                      
Debt Instrument, Face Amount   $ 10,000,000                  
Debt Issued in Connection with the TCBI Acquisition, Tranche One [Member] | Base Rate [Member]                      
Debt Instrument, Basis Spread on Variable Rate   3.50%                  
Debt Issued in Connection with the TCBI Acquisition, Tranche Two [Member]                      
Debt Instrument, Face Amount   $ 7,500,000                  
Debt Issued in Connection with the TCBI Acquisition, Tranche Two [Member] | Base Rate [Member]                      
Debt Instrument, Basis Spread on Variable Rate   3.50%                  
Debt Issued in Connection with the TCBI Acquisition, Tranche Three [Member]                      
Debt Instrument, Face Amount   $ 8,900,000                  
Debt Issued in Connection with the TCBI Acquisition, Tranche Three [Member] | Base Rate [Member]                      
Debt Instrument, Basis Spread on Variable Rate   5.95%