Shareholders' Equity (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Before-Tax Amount
Unrealized gain on AFS securities	$ 73,085	$ (31,235)	$ 16,051
Reclassification adjustment for securities gains included in net income	(4,733)	(37)	(9,071)
Amortization of net unrealized losses on available for sale securities transferred to held to maturity	8,070	2,694
Non-credit related unrealized loss on other-than-temporarily impaired debt securities	(873)	285	285
Unrecognized pension and postretirement income (cost)	(1,203)	1,798	(937)
Amortization of net unrecognized pension and postretirement income	1,316	2,116	2,092
Total Other Comprehensive Income	75,662	(24,379)	8,420
Tax Effect
Unrealized gain on AFS securities	(16,166)	6,909	(5,619)
Reclassification adjustment for securities gains included in net income	1,047	7	3,177
Amortization of net unrealized losses on available for sale securities transferred to held to maturity	(1,785)	(596)
Non-credit related unrealized loss on other-than-temporarily impaired debt securities	193	(63)	(100)
Unrecognized pension and postretirement income (cost)	266	(398)	328
Amortization of net unrecognized pension and postretirement income	(291)	(468)	(731)
Total Other Comprehensive Income	(16,736)	5,391	(2,945)
Net of Tax Amount
Unrealized gain on available for sale securities	56,919	(24,326)	10,432
Reclassification adjustment for securities gains included in net income	(3,686)	(30)	(5,894)
Non-credit related unrealized loss on other-than-temporarily impaired debt securities	(680)	222	185
Amortization of net unrealized losses on available for sale securities transferred to held to maturity	6,285	2,098
Unrecognized pension and postretirement income	(937)	1,400	(609)
Amortization of net unrecognized pension and postretirement income	1,025	1,648	1,361
Total Other Comprehensive Income	58,926	$ (18,988)	$ 5,475
Accounting Standards Update 2019-04
Before-Tax Amount
Amortization of net unrealized losses on available for sale securities transferred to held to maturity	$ 3,700

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