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Parent Company Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |  |
Net income/(loss) attributable to controlling interest |  | $ 545,042 | $ 165,515 | $ 227,046
Adjustments to reconcile net income/(loss) to net cash provided/(used) by operating activities: |  |  |  |
Depreciation, amortization, and other |  | 59,125 | 70,924 | 64,673
Provision/(benefit) for deferred income taxes |  | 103,557 | 121,001 | 79,604
Stock-based compensation expense |  | 23,171 | 20,627 | 17,536
Net (increase)/decrease in interest receivable and other assets |  | 32,950 | 240,629 | (7,921)
Net (decrease)/increase in interest payable and other liabilities |  | (3,980) | (16,877) | (36,546)
Total adjustments |  | (322,202) | (205,778) | (58,520)
Net cash provided/(used) by operating activities |  | 234,305 | (28,798) | 179,991
Securities: |  |  |  |
Sales and prepayments |  | 20,751 |  |
Sales and prepayments |  |  | 936,958 | 444,222
Purchases |  | (473,205) |  |
Purchases |  |  | (1,558,990) | (1,239,912)
Premises and equipment: |  |  |  |
Net cash provided/(used) by investing activities |  | 480,372 | (1,324,602) | (2,465,812)
Preferred stock: |  |  |  |
Cash dividends |  | (6,200) | (6,200) | (6,200)
Common stock: |  |  |  |
Exercise of stock options |  | 4,482 | 6,132 | 22,479
Cash dividends |  | (138,706) | (79,904) | (63,504)
Repurchase of shares | [1] | (104,768) | (5,554) | (97,396)
Term borrowings: |  |  |  |
Repayment of term borrowings |  | (69,025) | (147,413) | (267,527)
Net cash provided/(used) by financing activities |  | (761,398) | 1,767,652 | 2,292,552
Net increase/(decrease) in cash and cash equivalents |  | (46,721) | 414,252 | 6,731
Cash and cash equivalents at beginning of period |  | 1,452,046 | 1,037,794 | 1,031,063
Cash and cash equivalents at end of period |  | 1,405,325 | 1,452,046 | 1,037,794
Total interest paid |  | 307,578 | 140,373 | 92,456
Total taxes paid |  | 42,817 | 54,417 | 11,609
Parent Company |  |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |  |
Net income/(loss) attributable to controlling interest |  | 545,042 | 165,515 | 227,046
Less undistributed net income/(loss) of subsidiaries |  | 169,751 | (23,541) | 6,075
Income/(loss) before undistributed net income of subsidiaries |  | 375,291 | 189,056 | 220,971
Adjustments to reconcile net income/(loss) to net cash provided/(used) by operating activities: |  |  |  |
Depreciation, amortization, and other |  | 15 | 15 | 53
(Gain)/loss on securities |  | (28) | (109) | 148
Provision/(benefit) for deferred income taxes |  | 3,212 | 7,727 | 0
Stock-based compensation expense |  | 22,398 | 19,625 | 16,719
Net (increase)/decrease in interest receivable and other assets |  | 18,214 | 8,605 | (2,228)
Net (decrease)/increase in interest payable and other liabilities |  | (10,702) | 13,172 | (2,842)
Total adjustments |  | 33,109 | 49,035 | 11,850
Net cash provided/(used) by operating activities |  | 408,400 | 238,091 | 232,821
Securities: |  |  |  |
Sales and prepayments |  | 65 |  |
Sales and prepayments |  |  | 318 | 275
Purchases |  | 0 |  |
Purchases |  |  | 0 | (400)
Premises and equipment: |  |  |  |
Sales/(purchases) |  | (43) | 7 | (17)
Return on investment in subsidiary |  | 1,597 | 1,871 | 129
Investment in subsidiary |  |  | 0 | 0
Cash paid for business combination, net |  | (39,916) | (126,149) | 0
Net cash provided/(used) by investing activities |  | (38,297) | (123,953) | (13)
Preferred stock: |  |  |  |
Cash dividends |  | (6,200) | (6,200) | (6,200)
Common stock: |  |  |  |
Exercise of stock options |  | 4,482 | 6,132 | 22,479
Cash dividends |  | (138,706) | (79,904) | (63,504)
Repurchase of shares |  | (104,768) | (5,554) | (97,396)
Term borrowings: |  |  |  |
Repayment of term borrowings |  | (45,364) | 0 | 0
Net cash provided/(used) by financing activities |  | (290,556) | (85,526) | (144,621)
Net increase/(decrease) in cash and cash equivalents |  | 79,547 | 28,612 | 88,187
Cash and cash equivalents at beginning of period |  | 254,938 | 226,326 | 138,139
Cash and cash equivalents at end of period |  | 334,485 | 254,938 | 226,326
Total interest paid |  | 29,186 | 17,321 | 13,261
Total taxes paid |  | $ 49,056 | $ 23,020 | $ 27,126
[1] | 2018 and 2016 include $99.4 million and $93.5 million, respectively, repurchased under share repurchase programs.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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