Comprehensive Income (Details) - Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
COMPREHENSIVE INCOME (Details) - Comprehensive Income (Loss) [Line Items]
Sale of securities available-for-sale Net gains on sale of securities available-for-sale	$ 4,027	$ (1,780)	$ 9,585	$ (6,799)
Sale of securities available-for-sale Income tax expense	(1,055)	445	(2,477)	1,737
Total reclassification	2,399	(1,140)	5,908	(3,974)
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)		(1)
Sale of securities available-for-sale Income tax expense	2
Sale of securities available-for-sale	(7)		(1)
Amortization of pension plan net actuarial losses Salaries and employee benefits	(90)	(92)	(179)	(183)
Amortization of pension plan net actuarial losses Income tax benefit	25	26	50	51
Amortization of pension plan net actuarial losses	(65)	(66)	(129)	(132)
Total reclassification	$ (72)	$ (66)	$ (130)	$ (132)