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Borrowings and Borrowing Capacity - Additional Information (Details) - USD ($)
9 Months Ended
Nov. 27, 2019
Sep. 30, 2016
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Pledged debt securities, at carrying value     $ 83,013,000 $ 48,237,000
Amount outstanding at end of period     223,713,000 0
Federal funds purchased     0 0
Unsecured federal funds line of credit     227,500,000  
Subordinated notes     87,455,000 87,327,000
Junior subordinated debentures     39,944,000 39,566,000
Fixed-to-Floating Rate Subordinated Notes due 2026        
Debt Instrument [Line Items]        
Subordinated notes issued   $ 50,000,000    
Initial interest rate   6.50%    
Issuance costs of notes   $ 1,324,000    
Subordinated notes     $ 87,455,000  
Fixed-to-Floating Rate Subordinated Notes due 2026 | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Description of floating rate basis     three-month LIBOR  
Basis spread on variable rate   5.345%    
Fixed-to-Floating Rate Subordinated Notes due 2029        
Debt Instrument [Line Items]        
Subordinated notes issued $ 39,500,000      
Initial interest rate 4.875%      
Issuance costs of notes $ 1,218,000      
Subordinated notes       87,327,000
Fixed-to-Floating Rate Subordinated Notes due 2029 | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Description of floating rate basis     three-month LIBOR  
Basis spread on variable rate 3.33%      
Junior Subordinated Debentures | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Debt weighted average interest rate     2.24%  
Federal Reserve Bank Discount Window        
Debt Instrument [Line Items]        
Amount outstanding at end of period     $ 0  
Unused borrowing capacity     467,256,000  
Loans pledged outstanding     636,992,000  
Paycheck Protection Program Liquidity Facility        
Debt Instrument [Line Items]        
Amount outstanding at end of period     $ 223,713,000 0
Debt weighted average interest rate     0.35%  
Pledged Securities | Customer Repurchase Agreements        
Debt Instrument [Line Items]        
Pledged debt securities, at carrying value     $ 14,544,000 $ 2,997,000