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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net income, Gross	$ 71,178	$ 67,130	$ 235,097	$ 159,586
Unrealized holding gains (losses) during the period, Gross	34,392	(21,565)	220,864	(130,873)
Amounts reclassified into net income: HTM securities, Gross	(3)	(8)	(33)	(28)
Amounts reclassified into net income: Realized losses on disposals and OTTI of AFS securities, Gross	2,821	10,839	444	18,258
Total unrealized gains (losses) on investment securities, Gross	37,210	(10,734)	221,275	(112,643)
Amount reclassified into net income: Net actuarial loss, Gross	665	532	1,993	1,595
Total defined pension and other post-retirement benefit plans, Gross	665	532	1,993	1,595
Other comprehensive income (loss), Gross	37,875	(10,202)	223,268	(111,048)
Comprehensive income before tax	109,053	56,928	458,365	48,538
Net income, Tax	15,028	11,695	45,333	26,407
Unrealized holding gains (losses) during the period, Tax	7,224	(4,529)	46,381	(27,484)
Amounts reclassified into net income: HTM securities, Tax	(1)	(2)	(7)	(6)
Amounts reclassified into net income: Realized losses on disposals and OTTI of AFS securities, Tax	592	2,276	93	3,834
Total unrealized gains (losses) on investment securities, Tax	7,815	(2,255)	46,467	(23,656)
Amount reclassified into net income: Net actuarial loss, Tax	140	112	419	335
Total defined pension and other post-retirement benefit plans, Tax	140	112	419	335
Other comprehensive income (loss), Tax	7,955	(2,143)	46,886	(23,321)
Comprehensive income, Tax	22,983	9,552	92,219	3,086
Net income	56,150	55,435	189,764	133,179
Unrealized holding gains (losses) arising during period	27,168	(17,036)	174,483	(103,389)
Amounts reclassified into net income: HTM Securities	(2)	(6)	(26)	(22)
Amounts reclassified into net income: Realized losses on disposals and OTTI of available-for-sale securities	2,229	8,563	351	14,424
Total unrealized gains (losses) on investment securities	29,395	(8,479)	174,808	(88,987)
Amount reclassified into net income: Net actuarial loss	525	420	1,574	1,260
Total defined benefit pension and post-retirement plans	525	420	1,574	1,260
Other comprehensive income (loss)	29,920	(8,059)	176,382	(87,727)
Comprehensive income	$ 86,070	$ 47,376	$ 366,146	$ 45,452

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