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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE AND OTHER SHORT-TERM BORROWINGS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Securities sold under agreements to repurchase          
Outstanding balance at end of period $ 167,949   $ 167,949   $ 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%   2.00%    
Outstanding balance at end of period $ 167,949   $ 167,949   $ 182,990
Weighted average interest rate at end of period (as a percent) 0.48%   0.48%   0.83%
Fair Value of securities pledged $ 211,820   $ 211,820   $ 205,647
Average outstanding balance during the period $ 246,889 $ 213,195 $ 232,949 $ 216,070  
Average interest rate during the period (as a percent) 0.48% 0.59% 0.60% 0.46%  
Maximum outstanding at any month end during the period $ 219,812 $ 163,768 $ 226,002 $ 215,281  
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 85,033   85,033   110,854
Securities sold under agreements to repurchase | Mortgage backed securities - residential          
Securities sold under agreements to repurchase          
Fair Value of securities pledged 113,671   113,671   84,657
Securities sold under agreements to repurchase | Collateralized mortgage obligations          
Securities sold under agreements to repurchase          
Fair Value of securities pledged $ 13,116   $ 13,116   $ 10,136