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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