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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Securities sold under agreements to repurchase          
Outstanding balance at end of period $ 163,768   $ 163,768   $ 204,021
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 $ 163,768   $ 163,768   $ 204,021
Weighted average interest rate at end of period (as a percent) 0.74%   0.74%   0.31%
Fair Value of securities pledged $ 226,765   $ 226,765   $ 239,969
Average outstanding balance during the period $ 213,195 $ 208,160 $ 216,070 $ 202,018  
Average interest rate during the period (as a percent) 0.59% 0.31% 0.46% 0.22%  
Maximum outstanding at any month end during the period $ 163,768 $ 173,311 $ 215,281 $ 183,709  
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 169,179   169,179   71,824
Securities sold under agreements to repurchase | Mortgage backed securities - residential          
Securities sold under agreements to repurchase          
Fair Value of securities pledged 35,080   35,080   83,452
Securities sold under agreements to repurchase | Collateralized mortgage obligations          
Securities sold under agreements to repurchase          
Fair Value of securities pledged $ 22,506   $ 22,506   $ 84,693