Comprehensive Income (Details) - Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
COMPREHENSIVE INCOME (Details) - Comprehensive Income (Loss) [Line Items]
Sale of securities available-for-sale Net gains on sale of securities available-for-sale	$ 5,558	$ (5,019)
Sale of securities available-for-sale Income tax expense	(1,422)	1,292
Total reclassification	3,509	(2,834)
Amounts Reclassified from Accumulated Other Comprehensive Income/(Loss) [Member]
COMPREHENSIVE INCOME (Details) - Comprehensive Income (Loss) [Line Items]
Sale of securities available-for-sale Net gains on sale of securities available-for-sale	(8)
Sale of securities available-for-sale Income tax expense	2
Sale of securities available-for-sale	(6)
Amortization of pension plan net actuarial losses Salaries and employee benefits	89	91
Amortization of pension plan net actuarial losses Income tax benefit	(25)	(25)
Amortization of pension plan net actuarial losses	64	66
Total reclassification	$ 58	$ 66