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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Securities sold under agreements to repurchase          
Outstanding balance at end of period $ 173,311   $ 173,311   $ 173,473
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 $ 173,311   $ 173,311   $ 173,473
Weighted average interest rate at end of period (as a percent) 0.37%   0.37%   0.05%
Fair Value of securities pledged $ 188,643   $ 188,643   $ 203,074
Average outstanding balance during the period $ 208,160 $ 215,343 $ 202,018 $ 296,574  
Average interest rate during the period (as a percent) 0.31% 0.02% 0.22% 0.02%  
Maximum outstanding at any month end during the period $ 173,311 $ 169,691 $ 183,709 $ 367,373  
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 74,655   74,655   116,025
Securities sold under agreements to repurchase | Mortgage backed securities - residential          
Securities sold under agreements to repurchase          
Fair Value of securities pledged 58,437   58,437   45,894
Securities sold under agreements to repurchase | Collateralized mortgage obligations          
Securities sold under agreements to repurchase          
Fair Value of securities pledged $ 55,551   $ 55,551   $ 41,155