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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE AND OTHER SHORT-TERM BORROWINGS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Securities sold under agreements to repurchase          
Outstanding balance at end of period $ 303,315   $ 303,315   $ 290,967
Securities sold under agreements to repurchase          
Securities sold under agreements to repurchase          
Securities pledged more than repurchase agreements (as a percent) 2.00%   2.00%    
Outstanding balance at end of period $ 303,315   $ 303,315   $ 290,967
Weighted average interest rate at end of period (as a percent) 0.09%   0.09%   0.04%
Fair Value of securities pledged $ 347,815   $ 347,815   $ 309,815
Average outstanding balance during the period $ 294,388 $ 169,888 $ 297,263 $ 181,216  
Average interest rate during the period (as a percent) 0.07% 0.02% 0.05% 0.02%  
Maximum outstanding at any month end during the period $ 303,315 $ 174,928 $ 303,315 $ 200,704  
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 304,203   304,203   108,813
Securities sold under agreements to repurchase | Mortgage backed securities - residential          
Securities sold under agreements to repurchase          
Fair Value of securities pledged 42,422   42,422   167,561
Securities sold under agreements to repurchase | Collateralized mortgage obligations          
Securities sold under agreements to repurchase          
Fair Value of securities pledged $ 1,190   $ 1,190   $ 33,441