Comprehensive Income (Loss) - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 1,335	$ 3,160	$ 2,874	$ 8,380
Salaries and Employee Benefits	10,845	10,212	21,983	20,595
Total before Tax	17,488	11,721	34,221	21,895
Provision for income taxes	(4,209)	(2,562)	(7,662)	(4,609)
Net Income	13,279	9,159	26,559	17,286
Amounts Reclassified from Accumulated Other Comprehensive Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net Income			(77)
Amounts Reclassified from Accumulated Other Comprehensive Income | Unrealized Loss on Cash Flow Swap
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	30		58
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	(57)	(52)	(116)	(106)
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	0	(78)	(46)	(114)
Amounts Reclassified from Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before Tax	(27)	(130)	(104)	(220)
Provision for income taxes	7	33	27	57
Net Income	$ (20)	$ (97)	$ (77)	$ (163)