Comprehensive Income (Loss) - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 1,169	$ 2,396	$ 4,043	$ 10,776
Salaries and Employee Benefits	11,377	10,408	33,360	31,003
Total before Tax	16,810	13,839	51,031	35,734
Provision for income taxes	(3,821)	(2,793)	(11,483)	(7,402)
Net Income	12,989	11,046	39,548	28,332
Amounts Reclassified from Accumulated Other Comprehensive Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net Income			(112)
Amounts Reclassified from Accumulated Other Comprehensive Income | Unrealized Loss on Cash Flow Swap
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	34		92
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)	(53)	(175)	(159)
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	(22)	(57)	(68)	(171)
Amounts Reclassified from Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before Tax	(47)	(110)	(151)	(330)
Provision for income taxes	12	29	39	86
Net Income	$ (35)	$ (81)	$ (112)	$ (244)