XML 106 R91.htm IDEA: XBRL DOCUMENT v3.8.0.1
SHORT-TERM BORROWINGS (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SHORT-TERM BORROWINGS      
Maximum borrowing capacity $ 1,502,812,000    
Amount outstanding at December 31 32,000,000 $ 135,000,000 $ 69,000,000
Interest expense on short-term borrowings 183,000 578,000 254,000
Average amount outstanding during year 15,531,000 110,928,000 92,045,000
Highest month-end balance during year $ 69,000,000 $ 226,000,000 $ 157,000,000
Weighted average interest rate on balances outstanding at December 31 1.63% 0.74% 0.35%
Weighted average interest rate during year 1.18% 0.52% 0.28%
Federal Reserve discount window line of credit | Central Bank      
SHORT-TERM BORROWINGS      
Additional unused borrowings available $ 73,000,000 $ 63,700,000  
Commercial real estate and commercial loans pledged as collateral 129,200,000 $ 129,900,000  
FHLB line of credit      
SHORT-TERM BORROWINGS      
Additional unused borrowings available 1,470,000,000    
Commercial real estate and commercial loans pledged as collateral $ 2,020,000,000