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SHORT-TERM BORROWINGS (Narrative) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
creditLine
Dec. 31, 2019
USD ($)
loan
Dec. 15, 2015
USD ($)
Short-term Debt [Line Items]      
Number of credit lines | creditLine 1    
Short-term borrowings $ 167,872,000 $ 182,626,000  
Number of banks with commercial pledged loans | loan   2  
Retail Repurchase Agreements      
Short-term Debt [Line Items]      
Short-term borrowings $ 118,293,000 $ 84,486,000  
Debt term 12 months 12 months  
Advances from the federal discount window      
Short-term Debt [Line Items]      
Short-term borrowings $ 35,000,000 $ 0  
Pledged securities 2,120,000,000    
Pledged commercial loans 355,900,000 106,000,000.0  
Remaining borrowing capacity 1,290,000,000    
Nonrevolving Credit Facility      
Short-term Debt [Line Items]      
Borrowing capacity $ 55,000,000.0   $ 55,000,000.0
Basis spread on variable rate (as a percent) 2.35%    
Revolving Credit Facility      
Short-term Debt [Line Items]      
Borrowing capacity $ 45,000,000.0    
Short-term borrowings $ 0 $ 0