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Accumulated Other Comprehensive Income Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ 2,247,573	$ 2,229,857
Ending Balance	2,301,019	2,235,493
Unrealized Gains (Losses) on Investment Securities Not Other-Than-Temporarily Impaired
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(44,654)	(18,509)
Other comprehensive income before reclassifications	20,298	(27,644)
Amounts reclassified from accumulated other comprehensive income (loss)	(51)	(16)
Reclassification of stranded tax effects		(3,887)
Ending Balance	(23,433)	(50,056)
Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	680	458
Other comprehensive income before reclassifications	(82)	224
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Reclassification of stranded tax effects		0
Ending Balance	598	682
Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(15,089)	(14,923)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	291	339
Reclassification of stranded tax effects		(3,214)
Ending Balance	(14,798)	(17,798)
Total
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(59,063)	(32,974)
Other comprehensive income before reclassifications	20,216	(27,420)
Amounts reclassified from accumulated other comprehensive income (loss)	240	323
Reclassification of stranded tax effects		(7,101)
Ending Balance	(37,633)	$ (67,172)
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from accumulated other comprehensive income (loss)	(974)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Investment Securities Not Other-Than-Temporarily Impaired
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from accumulated other comprehensive income (loss)	(974)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from accumulated other comprehensive income (loss)	0
Reclassification out of Accumulated Other Comprehensive Income | Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from accumulated other comprehensive income (loss)	$ 0

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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