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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]                
Unrealized gain (loss) on investment securities $ 2,612 $ 99 $ 12,614 $ 18,951        
Unrealized gain (loss) on derivatives 202 202 607 607        
Retirement obligation 0 0 0 0        
Total 2,814 301 13,221 19,558        
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]                
Unrealized gain (loss) on investment securities 276 398 1,630 234        
Unrealized gain (loss) on derivatives 0 0 0 0        
Retirement obligation (335) (317) (1,005) (951)        
Total (59) 81 625 (717)        
Transactions Pre-tax                
Unrealized gain (loss) on investment securities 2,336 (299) 10,984 18,717        
Unrealized gain (loss) on derivatives 202 202 607 607        
Unfunded pension obligation 335 317 1,005 951        
Total 2,873 220 12,596 20,275        
Transactions Tax-effect                
Unrealized gain (loss) on investment securities (835) 137 (3,920) (6,644)        
Unrealized gain (loss) on derivatives (73) (74) (222) (223)        
Retirement obligation (122) (117) (390) (350)        
Total (1,030) (54) (4,532) (7,217)        
Transactions Net of tax                
Unrealized gain (loss) on investment securities 1,501 (162) 7,064 12,073        
Unrealized gain (loss) on derivatives 129 128 385 384        
Retirement obligation 213 200 615 601        
Total 1,843 166 8,064 13,058        
Balances Net of tax                
Unrealized gain (loss) on investment securities 2,515 7,140 2,515 7,140 $ 1,014 $ (4,549) $ 7,302 $ (4,933)
Unrealized gain (loss) on cash flow hedges (706) (1,215) (706) (1,215) (835) (1,091) (1,343) (1,599)
Retirement obligation (22,188) (23,447) (22,188) (23,447) (22,401) (22,803) (23,647) (24,048)
Total $ (20,379) $ (17,522) $ (20,379) $ (17,522) $ (22,222) $ (28,443) $ (17,688) $ (30,580)