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Parent Company Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net income/(loss) attributable to controlling interest | $ 440,908 | $ 545,042 | $ 165,515
Adjustments to reconcile net income/(loss) to net cash provided/(used) by operating activities: |  |  |
Depreciation, amortization, and other | 65,239 | 59,125 | 70,924
(Gain)/loss on securities | (441) | (212,896) | (109)
Provision/(benefit) for deferred income taxes | 14,357 | 103,557 | 121,001
Stock-based compensation expense | 22,730 | 23,171 | 20,627
Net (increase)/decrease in interest receivable and other assets | (116,888) | 32,950 | 240,629
Net (decrease)/increase in interest payable and other liabilities | 95,200 | (3,980) | (16,877)
Total adjustments | 377,921 | (322,202) | (205,778)
Net cash provided/(used) by operating activities | 830,294 | 234,305 | (28,798)
Securities: |  |  |
Sales and prepayments | 191,681 | 20,751 |
Sales and prepayments |  |  | 936,958
Premises and equipment: |  |  |
Net cash provided/(used) by investing activities | (2,389,842) | 480,372 | (1,324,602)
Preferred stock: |  |  |
Cash dividends | (6,200) | (6,200) | (6,200)
Common stock: |  |  |
Exercise of stock options | 9,665 | 4,482 | 6,132
Cash dividends | (171,076) | (138,706) | (79,904)
Repurchase of shares | (134,813) | (104,768) | (5,554)
Term borrowings: |  |  |
Repayment of term borrowings | (405,562) | (69,025) | (147,413)
Net cash provided/(used) by financing activities | 1,421,116 | (761,398) | 1,767,652
Net increase/(decrease) in cash and cash equivalents | (138,432) | (46,721) | 414,252
Cash and cash equivalents at beginning of period | 1,405,325 | 1,452,046 | 1,037,794
Cash and cash equivalents at end of period | 1,266,893 | 1,405,325 | 1,452,046
Total interest paid | 410,883 | 307,578 | 140,373
Total taxes paid | 70,505 | 42,817 | 54,417
Parent Company |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net income/(loss) attributable to controlling interest | 440,908 | 545,042 | 165,515
Less undistributed net income/(loss) of subsidiaries | 157,572 | 169,751 | (23,541)
Income/(loss) before undistributed net income of subsidiaries | 283,336 | 375,291 | 189,056
Adjustments to reconcile net income/(loss) to net cash provided/(used) by operating activities: |  |  |
Depreciation, amortization, and other | (915) | 15 | 15
(Gain)/loss on securities | (317) | (28) | (109)
Provision/(benefit) for deferred income taxes | 3,648 | 3,212 | 7,727
Stock-based compensation expense | 21,909 | 22,398 | 19,625
Net (increase)/decrease in interest receivable and other assets | 10,170 | 18,214 | 8,605
Net (decrease)/increase in interest payable and other liabilities | 17,736 | (10,702) | 13,172
Total adjustments | 52,231 | 33,109 | 49,035
Net cash provided/(used) by operating activities | 335,567 | 408,400 | 238,091
Securities: |  |  |
Sales and prepayments | 1,457 | 65 |
Sales and prepayments |  |  | 318
Premises and equipment: |  |  |
Sales/(purchases) | 19 | (43) | 7
Return on investment in subsidiary | 164 | 1,597 | 1,871
Cash paid for business combination, net | 0 | (39,916) | (126,149)
Net cash provided/(used) by investing activities | 1,640 | (38,297) | (123,953)
Preferred stock: |  |  |
Cash dividends | (6,200) | (6,200) | (6,200)
Common stock: |  |  |
Exercise of stock options | 9,665 | 4,482 | 6,132
Cash dividends | (171,076) | (138,706) | (79,904)
Repurchase of shares | (134,813) | (104,768) | (5,554)
Term borrowings: |  |  |
Repayment of term borrowings | 0 | (45,364) | 0
Net cash provided/(used) by financing activities | (302,424) | (290,556) | (85,526)
Net increase/(decrease) in cash and cash equivalents | 34,783 | 79,547 | 28,612
Cash and cash equivalents at beginning of period | 334,485 | 254,938 | 226,326
Cash and cash equivalents at end of period | 369,268 | 334,485 | 254,938
Total interest paid | 29,169 | 29,186 | 17,321
Total taxes paid | $ 43,418 | $ 49,056 | $ 23,020

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