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Parent Company Financial Information (Statements of Cash Flows) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |  |
Net income/(loss) attributable to controlling interest |  | $ 165,515,000 | $ 227,046,000 | $ 85,879,000
Adjustments to reconcile net income/(loss) to net cash provided/(used) by operating activities: |  |  |  |
Depreciation, amortization, and other |  | 70,924,000 | 64,673,000 | 60,743,000
(Gain)/loss on securities |  | (109,000) | 144,000 | 458,000
Provision/(benefit) for deferred income taxes |  | 121,001,000 | 79,604,000 | 24,196,000
Stock-based compensation expense |  | 20,627,000 | 17,536,000 | 13,796,000
(Gain)/loss on extinguishment of debt |  | 14,329,000 | 0 | (5,793,000)
Net (increase)/decrease in interest receivable and other assets |  | 243,057,000 | (7,191,000) | (78,824,000)
Net (decrease)/increase in interest payable and other liabilities |  | (16,877,000) | (36,546,000) | (39,153,000)
Total adjustments |  | (194,338,000) | (55,780,000) | 270,081,000
Net cash provided/(used) by operating activities |  | (17,358,000) | 182,731,000 | 367,394,000
Securities: |  |  |  |
Sales and prepayments |  | 936,958,000 | 444,222,000 | 69,650,000
Purchases |  | (1,558,990,000) | (1,239,912,000) | (1,066,194,000)
Premises and equipment: |  |  |  |
Decrease/(increase) in interest-bearing cash |  | (121,434,000) | (457,198,000) | 1,019,131,000
Net cash provided/(used) by investing activities |  | (1,336,042,000) | (2,468,552,000) | (518,404,000)
Preferred stock: |  |  |  |
Cash dividends |  | (6,200,000) | (6,200,000) | (6,200,000)
Common stock: |  |  |  |
Exercise of stock options |  | 6,132,000 | 22,479,000 | 7,219,000
Cash dividends |  | (79,904,000) | (63,504,000) | (53,947,000)
Repurchase of shares | [1] | (5,554,000) | (97,396,000) | (32,648,000)
Term borrowings: |  |  |  |
Issuance |  | 121,184,000 | 100,000 | 495,555,000
Repayment of term borrowings |  | (147,413,000) | (267,527,000) | (1,026,708,000)
Short-term borrowings |  | 2,080,039,000 | 10,277,000 | (816,324,000)
Net cash provided/(used) by financing activities |  | 1,767,652,000 | 2,292,552,000 | 110,668,000
Net increase/(decrease) in cash and cash equivalents |  | 414,252,000 | 6,731,000 | (40,342,000)
Cash and cash equivalents at beginning of period |  | 1,037,794,000 | 1,031,063,000 | 1,071,405,000
Cash and cash equivalents at end of period |  | 1,452,046,000 | 1,037,794,000 | 1,031,063,000
Total interest paid |  | 140,373,000 | 92,456,000 | 90,722,000
Total taxes paid |  | 54,417,000 | 11,609,000 | 14,990,000
Parent Company |  |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |  |
Net income/(loss) attributable to controlling interest |  | 165,515,000 | 227,046,000 | 85,879,000
Less undistributed net income/(loss) of subsidiaries |  | (23,541,000) | 6,075,000 | (207,939,000)
Income/(loss) before undistributed net income of subsidiaries |  | 189,056,000 | 220,971,000 | 293,818,000
Adjustments to reconcile net income/(loss) to net cash provided/(used) by operating activities: |  |  |  |
Depreciation, amortization, and other |  | 15,000 | 53,000 | (276,000)
(Gain)/loss on securities |  | (109,000) | 148,000 | 259,000
Provision/(benefit) for deferred income taxes |  | 7,727,000 | 0 | 0
Stock-based compensation expense |  | 19,625,000 | 16,719,000 | 12,810,000
(Gain)/loss on extinguishment of debt |  | 0 | 0 | (5,793,000)
Net (increase)/decrease in interest receivable and other assets |  | 8,605,000 | (2,228,000) | (4,544,000)
Net (decrease)/increase in interest payable and other liabilities |  | 13,172,000 | (2,842,000) | (5,791,000)
Total adjustments |  | 49,035,000 | 11,850,000 | (3,335,000)
Net cash provided/(used) by operating activities |  | 238,091,000 | 232,821,000 | 290,483,000
Securities: |  |  |  |
Sales and prepayments |  | 318,000 | 275,000 | 1,371,000
Purchases |  | 0 | (400,000) | (740,000)
Premises and equipment: |  |  |  |
Sales/(purchases) |  | 7,000 | (17,000) | 14,000
Decrease/(increase) in interest-bearing cash |  | 0 | 0 | 0
Return on investment in subsidiary |  | 1,871,000 | 129,000 | 93,000
Investment in subsidiary |  | 0 | 0 | (9,372,000)
Cash paid for business combination, net |  | (126,149,000) | 0 | (18,251,000)
Net cash provided/(used) by investing activities |  | (123,953,000) | (13,000) | (26,885,000)
Preferred stock: |  |  |  |
Cash dividends |  | (6,200,000) | (6,200,000) | (6,200,000)
Common stock: |  |  |  |
Exercise of stock options |  | 6,132,000 | 22,479,000 | 7,219,000
Cash dividends |  | (79,904,000) | (63,504,000) | (53,947,000)
Repurchase of shares |  | (5,554,000) | (97,396,000) | (32,648,000)
Term borrowings: |  |  |  |
Issuance |  |  | 0 | 495,555,000
Repayment of term borrowings |  | 0 | 0 | (700,000,000)
Short-term borrowings |  |  | 0 | (3,000,000)
Net cash provided/(used) by financing activities |  | (85,526,000) | (144,621,000) | (293,021,000)
Net increase/(decrease) in cash and cash equivalents |  | 28,612,000 | 88,187,000 | (29,423,000)
Cash and cash equivalents at beginning of period |  | 226,326,000 | 138,139,000 | 167,562,000
Cash and cash equivalents at end of period |  | 254,938,000 | 226,326,000 | 138,139,000
Total interest paid |  | 17,321 | 13,261,000 | 24,345,000
Total taxes paid |  | $ 23,020,000 | $ 27,126,000 | $ 32,202,000
[1] | 2016 and 2015 include $93.5 million and $28.4 million, respectively, repurchased under share repurchase programs.

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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 + Details
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- Definition The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The net cash inflow or outflow in Interest-bearing Deposits by banks in other financial institutions for relatively short periods of time including, for example, certificates of deposits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6477933&loc=d3e60009-112784 + Details
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- Definition The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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