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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Securities sold under agreements to repurchase      
Outstanding balance at end of period $ 167,617 $ 182,990  
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 $ 167,617 $ 182,990  
Weighted average interest rate at end of period (as a percent) 0.32% 0.83%  
Fair Value of securities pledged $ 221,310 $ 205,647  
Average outstanding balance during the period $ 236,883 $ 225,145 $ 219,515
Average interest rate during the period (as a percent) 0.51% 0.50% 0.23%
Maximum outstanding at any month end during the period $ 276,927 $ 260,147 $ 293,944
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 70,015 110,854  
Securities sold under agreements to repurchase | Mortgage backed securities - residential      
Securities sold under agreements to repurchase      
Fair Value of securities pledged 134,265 84,657  
Securities sold under agreements to repurchase | Collateralized mortgage obligations      
Securities sold under agreements to repurchase      
Fair Value of securities pledged $ 17,030 $ 10,136