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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Securities sold under agreements to repurchase          
Outstanding balance at end of period $ 113,334   $ 113,334   $ 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 $ 113,334   $ 113,334   $ 173,473
Weighted average interest rate at end of period (as a percent) 0.38%   0.38%   0.05%
Fair Value of securities pledged $ 156,592   $ 156,592   $ 203,074
Average outstanding balance during the period $ 179,594 $ 267,574 $ 198,896 $ 337,636  
Average interest rate during the period (as a percent) 0.33% 0.02% 0.17% 0.02%  
Maximum outstanding at any month end during the period $ 156,339 $ 263,228 $ 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 55,812   55,812   116,025
Securities sold under agreements to repurchase | Mortgage backed securities - residential          
Securities sold under agreements to repurchase          
Fair Value of securities pledged 57,295   57,295   45,894
Securities sold under agreements to repurchase | Collateralized mortgage obligations          
Securities sold under agreements to repurchase          
Fair Value of securities pledged $ 43,485   $ 43,485   $ 41,155