Comprehensive Income (Details) - Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
COMPREHENSIVE INCOME (Details) - Comprehensive Income (Loss) [Line Items]
Sale of securities available-for-sale Net gains on sale of securities available-for-sale	$ (1,423)	$ 4,027	$ 4,829	$ 9,585
Sale of securities available-for-sale Income tax expense	392	(1,055)	(1,299)	(2,477)
Net interest income on swaps - Borrowings	(318)	176	(311)	358
Net interest income on swaps Income tax expense	71	(39)	69	(79)
Net interest income on swaps	247	(138)	242	(279)
Total reclassification	(1,155)	2,399	1,456	5,908
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		(9)	29	(1)
Sale of securities available-for-sale Income tax expense		2	(6)
Sale of securities available-for-sale		(7)	23	(1)
Net interest income on swaps - Borrowings	(318)	176	(311)	358
Net interest income on swaps Income tax expense	71	(39)	69	(79)
Net interest income on swaps	(247)	137	(242)	279
Amortization of pension plan net actuarial losses - other components of net periodic pension expense	(76)	(90)	(151)	(179)
Amortization of pension plan net actuarial losses Income tax benefit	21	25	42	50
Amortization of pension plan net actuarial losses	(55)	(65)	(109)	(129)
Total reclassification	$ (302)	$ 65	$ (328)	$ 149