Comprehensive Income (Details) - Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
COMPREHENSIVE INCOME (Details) - Comprehensive Income (Loss) [Line Items]
Sale of securities available-for-sale Net gains on sale of securities available-for-sale	$ 6,252	$ 5,558
Sale of securities available-for-sale Income tax expense	(1,691)	(1,422)
Net interest income on swaps - Borrowings	7	182
Net interest income on swaps Income tax expense	(2)	(40)
Net interest income on swaps	(5)	(142)
Total reclassification	2,611	3,509
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	29	8
Sale of securities available-for-sale Income tax expense	(6)	(2)
Sale of securities available-for-sale	23	6
Net interest income on swaps - Borrowings	7	182
Net interest income on swaps Income tax expense	(2)	(40)
Net interest income on swaps	5	142
Amortization of pension plan net actuarial losses - other components of net periodic pension expense	(75)	(89)
Amortization of pension plan net actuarial losses Income tax benefit	21	25
Amortization of pension plan net actuarial losses	(54)	(64)
Total reclassification	$ (26)	$ 84