Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 1,539	$ 5,220
Salaries and Employee Benefits	11,138	10,383
Total before Tax	16,733	10,174
Provision for income taxes	(3,453)	(2,047)
Net Income	13,280	8,127
Amounts Reclassified from Accumulated Other Comprehensive Income | Unrealized Loss on Cash Flow Swap
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	28
Amounts Reclassified from Accumulated Other Comprehensive Income | Amortization of Defined Benefit Pension, Prior-Service Costs
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Salaries and Employee Benefits	(59)	(54)
Amounts Reclassified from Accumulated Other Comprehensive Income | Amortization of Defined Benefit Pension, Actuarial Loss
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Salaries and Employee Benefits	(46)	(36)
Amounts Reclassified from Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before Tax	(77)	(90)
Provision for income taxes	20	24
Net Income	$ (57)	$ (66)