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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Securities sold under agreements to repurchase      
Outstanding balance at end of period $ 290,967 $ 211,026  
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 $ 290,967 $ 211,026  
Weighted average interest rate at end of period (as a percent) 0.04% 0.04%  
Fair Value of securities pledged $ 309,815 $ 230,269  
Average outstanding balance during the period $ 231,430 $ 204,797 $ 236,883
Average interest rate during the period (as a percent) 0.03% 0.09% 0.51%
Maximum outstanding at any month end during the period $ 432,047 $ 295,698 $ 276,927
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 108,813 60,059  
Securities sold under agreements to repurchase | Mortgage backed securities - residential      
Securities sold under agreements to repurchase      
Fair Value of securities pledged 167,561 140,554  
Securities sold under agreements to repurchase | Collateralized mortgage obligations      
Securities sold under agreements to repurchase      
Fair Value of securities pledged $ 33,441 $ 29,656