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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE AND OTHER SHORT-TERM BORROWINGS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Securities sold under agreements to repurchase      
Outstanding balance at end of period $ 144,375   $ 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%    
Outstanding balance at end of period $ 144,375   $ 173,473
Weighted average interest rate at end of period (as a percent) 0.10%   0.05%
Fair Value of securities pledged $ 197,740   $ 203,074
Average outstanding balance during the period $ 218,412 $ 407,698  
Average interest rate during the period (as a percent) 0.05% 0.02%  
Maximum outstanding at any month end during the period $ 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 115,726   116,025
Securities sold under agreements to repurchase | Mortgage backed securities - residential      
Securities sold under agreements to repurchase      
Fair Value of securities pledged 35,996   45,894
Securities sold under agreements to repurchase | Collateralized mortgage obligations      
Securities sold under agreements to repurchase      
Fair Value of securities pledged $ 46,018   $ 41,155