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Condensed Financial Statements of Parent Company - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net income | $ 120,632 | $ 186,483 | $ 178,871
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 46,367 | 33,121 | 35,696
Share-based compensation | 23,318 | 8,839 | 8,783
Gain on sale of securities available for sale | (50) | (2,711) | 655
Decrease (increase) in other assets | 27,365 | (29,932) | 8,962
Decrease in other liabilities | 74,079 | 9,959 | (1,186)
Net cash provided by operating activities | 536,943 | 181,028 | 283,711
Cash flows from investing activities: |  |  |
Net cash inflow from acquisitions | 2,566,376 |  |
Net cash provided by (used in) investing activities | 1,229,778 | (795,053) | (282,149)
Cash flows from financing activities: |  |  |
Common stock issuance | 1,537 | 1,394 | 1,331
Common stock repurchased | (32,431) | (159,431) | (70,577)
Dividends paid on common stock | (98,256) | (57,696) | (50,557)
Stock options exercised | 1,681 | 1,230 | 1,032
Net cash provided by financing activities | 2,153,830 | 893,746 | 29,794
Net increase in cash and cash equivalents | 3,920,551 | 279,721 | 31,356
Cash and cash equivalents at beginning of period | 688,704 | 408,983 | 377,627
Cash and cash equivalents at end of period | 4,609,255 | 688,704 | 408,983
Parent company | Reportable Legal Entities |  |  |
Cash flows from operating activities: |  |  |
Net income | 120,632 | 186,483 | 178,871
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 1,528 | 666 | 666
Share-based compensation | 23,316 | 8,839 | 8,783
Gain on sale of securities available for sale |  | (5,366) |
Decrease (increase) in other assets | (11,710) | (159) | 1,465
Decrease in other liabilities | (12,323) | (959) | (2,048)
Undistributed earnings of subsidiary | (66,790) | 20,229 | (73,753)
Net cash provided by operating activities | 54,653 | 209,733 | 113,984
Cash flows from investing activities: |  |  |
Proceeds from sales and calls of other investment securities |  | 5,366 |
Repayment of investments in and advances to subsidiary | 163,000 |  |
Net cash inflow from acquisitions | 19,650 |  |
Net cash provided by (used in) investing activities | 182,650 | 5,366 |
Cash flows from financing activities: |  |  |
Common stock issuance | 1,537 | 1,394 | 1,331
Common stock repurchased | (32,431) | (159,431) | (70,577)
Dividends paid on common stock | (98,256) | (57,696) | (50,557)
Stock options exercised | 1,681 | 1,230 | 1,032
Net cash provided by financing activities | (127,469) | (214,503) | (118,771)
Net increase in cash and cash equivalents | 109,834 | 596 | (4,787)
Cash and cash equivalents at beginning of period | 21,688 | 21,092 | 25,879
Cash and cash equivalents at end of period | $ 131,522 | $ 21,688 | $ 21,092

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