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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE AND OTHER SHORT-TERM BORROWINGS (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Securities sold under agreements to repurchase      
Outstanding balance at end of period $ 175,580,000   $ 211,026,000
Securities sold under agreements to repurchase      
Securities sold under agreements to repurchase      
Securities pledged more than repurchase agreements (as a percent) 2.00%    
Outstanding balance at end of period $ 175,580,000   $ 211,026,000
Weighted average interest rate at end of period (as a percent) 0.02%   0.04%
Fair Value of securities pledged $ 203,789,000   $ 230,269,000
Average outstanding balance during the period $ 192,669,000 $ 208,969,000  
Average interest rate during the period (as a percent) 0.02% 0.23%  
Maximum outstanding at any month end during the period $ 200,704,000 $ 143,801,000  
Securities sold under agreements to repurchase | U.S. Treasury securities and U.S. Government agencies      
Securities sold under agreements to repurchase      
Fair Value of securities pledged 44,744,000   60,059,000
Securities sold under agreements to repurchase | Mortgage backed securities - residential      
Securities sold under agreements to repurchase      
Fair Value of securities pledged 131,835,000   140,554,000
Securities sold under agreements to repurchase | Collateralized mortgage obligations      
Securities sold under agreements to repurchase      
Fair Value of securities pledged $ 27,210,000   $ 29,656,000