Derivatives and Hedging - Derivatives by Balance Sheet Location (Details) - USD ($) $ in Thousands		Mar. 31, 2017		Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative assets		$ 203,289		$ 234,002
Derivative liabilities		220,530		248,669
Derivatives designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative assets	[1]	32,440	[2]	41,230
Derivative liabilities	[3]	47,871	[2]	33,269
Derivatives designated as hedging instrument | Fair value hedges
Derivatives, Fair Value [Line Items]
Derivative assets	[1]	32,003	[2]	38,890
Derivative liabilities	[3]	16,169	[2]	14,226
Derivatives designated as hedging instrument | Fair value hedges | Interest rate swap long term debt
Derivatives, Fair Value [Line Items]
Derivative, notional amount		2,123,950	[2]	2,123,950
Derivative assets	[1]	32,003	[2]	38,890
Derivative liabilities	[3]	16,169	[2]	14,226
Derivatives designated as hedging instrument | Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative assets	[1]	437	[2]	2,340
Derivative liabilities	[3]	31,702	[2]	19,043
Derivatives designated as hedging instrument | Cash flow hedges | Interest rate swap commercial loan
Derivatives, Fair Value [Line Items]
Derivative, notional amount		8,950,000	[2]	7,625,000
Derivative assets	[1]	4	[2]	2,340
Derivative liabilities	[3]	25,369	[2]	11,570
Derivatives designated as hedging instrument | Cash flow hedges | Interest rate swap FHLB advances
Derivatives, Fair Value [Line Items]
Derivative, notional amount		120,000	[2]	120,000
Derivative liabilities	[3]	6,333	[2]	7,093
Derivatives designated as hedging instrument | Cash flow hedges | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative, notional amount		4,907	[2]	3,618
Derivative assets	[1],[2]	433
Derivative liabilities	[3]	0	[2]	380
Free-standing derivatives not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative assets	[1]	333,442	[2]	384,581
Derivative liabilities	[3]	277,164	[2]	312,065
Free-standing derivatives not designated as hedging instrument | Forward contracts related to residential mortgage loans held for sale
Derivatives, Fair Value [Line Items]
Derivative, notional amount		254,000	[2]	251,500
Derivative assets	[1]	374	[2]	2,479
Derivative liabilities	[3]	1,053	[2]	493
Free-standing derivatives not designated as hedging instrument | Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Derivative, notional amount		156,991	[2]	150,616
Derivative assets	[1]	3,178	[2]	2,424
Derivative liabilities	[3]	1	[2]	32
Free-standing derivatives not designated as hedging instrument | Purchased equity option related to equity-linked CDs
Derivatives, Fair Value [Line Items]
Derivative, notional amount		818,832	[2]	833,763
Derivative assets	[1]	60,829	[2]	57,198
Free-standing derivatives not designated as hedging instrument | Written equity option related to equity-linked CDs
Derivatives, Fair Value [Line Items]
Derivative, notional amount		750,485	[2]	770,632
Derivative liabilities	[3]	56,178	[2]	53,044
Free-standing derivatives not designated as hedging instrument | Forward and swap contracts related to commercial loans
Derivatives, Fair Value [Line Items]
Derivative, notional amount		514,870	[2]	424,155
Derivative assets	[1]	869	[2]	3,741
Derivative liabilities	[3]	3,144	[2]	1,723
Free-standing derivatives not designated as hedging instrument | Spot contracts related to commercial loans
Derivatives, Fair Value [Line Items]
Derivative, notional amount		56,775	[2]	54,599
Derivative assets	[1]	34	[2]	134
Derivative liabilities	[3]	25	[2]	0
Free-standing derivatives not designated as hedging instrument | Equity contracts, swap associated with sale of Visa Inc. Class B shares
Derivatives, Fair Value [Line Items]
Derivative, notional amount		77,807	[2]	68,308
Derivative liabilities	[3]	1,945	[2]	1,708
Free-standing derivatives not designated as hedging instrument | Futures contracts
Derivatives, Fair Value [Line Items]
Derivative, notional amount	[4]	119,000	[2]	104,000
Free-standing derivatives not designated as hedging instrument | Interest rate contracts for customers
Derivatives, Fair Value [Line Items]
Derivative, notional amount		28,964,141	[2]	28,000,014
Derivative assets	[1]	244,525	[2]	290,238
Derivative liabilities	[3]	193,258	[2]	228,748
Free-standing derivatives not designated as hedging instrument | Foreign exchange contracts for customers
Derivatives, Fair Value [Line Items]
Derivative, notional amount		859,575	[2]	870,084
Derivative assets	[1]	23,633	[2]	28,367
Derivative liabilities	[3]	21,560	[2]	26,317
Free-standing derivatives not designated as hedging instrument | Total trading account assets and liabilities
Derivatives, Fair Value [Line Items]
Derivative assets	[1]	268,158	[2]	318,605
Derivative liabilities	[3]	$ 214,818	[2]	$ 255,065

[1] Derivative assets, except for trading account assets that are recorded as a component of trading account assets on the Company's Unaudited Condensed Consolidated Balance Sheets, are recorded in other assets on the Company’s Unaudited Condensed Consolidated Balance Sheets.

[2] In January 2017, a clearing organization adopted a rule change that requires transactions to be considered settled-to-market each day. Beginning in the first quarter of 2017, to the extent the Company determined transactions with this clearing organization to be settled-to-market, the impact was a reduction to the derivative assets and liabilities as well as a corresponding decrease in cash collateral.

[3] Derivative liabilities are recorded in accrued expenses and other liabilities on the Company’s Unaudited Condensed Consolidated Balance Sheets.

[4] Changes in fair value are cash settled daily; therefore, there is no ending balance at any given reporting period.