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Condensed Financial Statements of Parent Company (Tables) | 12 Months Ended
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Dec. 31, 2019
Condensed Financial Statements of Parent Company |
Schedule of condensed balance sheet | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
(Dollars in thousands) | ​ | 2019 | ​ | 2018 |
ASSETS |  | ​ |  |  | ​ |  | ​
Cash | ​ | $ | 21,688 | ​ | $ | 21,092 | ​
Investment in subsidiary | ​ |  | 2,467,466 | ​ |  | 2,461,836 | ​
Other assets | ​ |  | 204 | ​ |  | 54 | ​
Total assets | ​ | $ | 2,489,358 | ​ | $ | 2,482,982 | ​
LIABILITIES AND SHAREHOLDERS’ EQUITY | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities | ​ | $ | 116,345 | ​ | $ | 116,686 | ​
Shareholders’ equity | ​ |  | 2,373,013 | ​ |  | 2,366,296 | ​
Total liabilities and shareholders’ equity | ​ | $ | 2,489,358 | ​ | $ | 2,482,982 | ​
Schedule of condensed statements of income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
(Dollars in thousands) | ​ | 2019 | ​ | 2018 | ​ | 2017 |
Income: |  | ​ |  |  | ​ |  |  | ​ |  | ​
Dividends from subsidiary | ​ | $ | 214,852 | ​ | $ | 117,298 | ​ | $ | 63,703 | ​
Operating income | ​ |  | 5,386 | ​ |  | 67 | ​ |  | 580 | ​
Total income | ​ |  | 220,238 | ​ |  | 117,365 | ​ |  | 64,283 | ​
Operating expenses | ​ |  | 15,409 | ​ |  | 15,302 | ​ |  | 15,482 | ​
Income before income tax benefit and equity in undistributed earnings of subsidiaries | ​ |  | 204,829 | ​ |  | 102,063 | ​ |  | 48,801 | ​
Applicable income tax benefit | ​ |  | 1,883 | ​ |  | 3,055 | ​ |  | 5,053 | ​
Equity in undistributed earnings of subsidiary (excess distribution) | ​ |  | (20,229) | ​ |  | 73,753 | ​ |  | 33,700 | ​
Net income available to common shareholders | ​ | $ | 186,483 | ​ | $ | 178,871 | ​ | $ | 87,554 | ​
Schedule of condensed statements of cash flows | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
(Dollars in thousands) | ​ | 2019 | ​ | 2018 | ​ | 2017 |
Cash flows from operating activities: |  | ​ |  |  | ​ |  |  | ​ |  | ​
Net income | ​ | $ | 186,483 | ​ | $ | 178,871 | ​ | $ | 87,554 | ​
Adjustments to reconcile net income to net cash provided by operating activities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation and amortization | ​ |  | 666 | ​ |  | 666 | ​ |  | 666 | ​
Share-based compensation | ​ |  | 8,839 | ​ |  | 8,783 | ​ |  | 6,934 | ​
Gain on sale of securities available for sale | ​ |  | (5,366) | ​ |  | — | ​ |  | (486) | ​
Decrease (increase) in other assets | ​ |  | (159) | ​ |  | 1,465 | ​ |  | (1,564) | ​
Decrease in other liabilities | ​ |  | (959) | ​ |  | (2,048) | ​ |  | (6,341) | ​
Undistributed earnings of subsidiary | ​ |  | 20,229 | ​ |  | (73,753) | ​ |  | (33,700) | ​
Net cash provided by operating activities | ​ |  | 209,733 | ​ |  | 113,984 | ​ |  | 53,063 | ​
Cash flows from investing activities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Proceeds from sales and calls of other investment securities | ​ | ​ | 5,366 | ​ | ​ | — | ​ | ​ | 687 | ​
Net cash inflow from acquisitions | ​ |  | — | ​ |  | — | ​ |  | 15,468 | ​
Net cash provided by investing activities | ​ |  | 5,366 | ​ |  | — | ​ |  | 16,155 | ​
Cash flows from financing activities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Repayment of other borrowings | ​ |  | — | ​ |  | — | ​ |  | (30,000) | ​
Common stock issuance | ​ |  | 1,394 | ​ |  | 1,331 | ​ |  | 1,056 | ​
Common stock repurchased | ​ |  | (159,431) | ​ |  | (70,577) | ​ |  | (5,512) | ​
Dividends paid on common stock | ​ |  | (57,696) | ​ |  | (50,557) | ​ |  | (38,623) | ​
Stock options exercised | ​ |  | 1,230 | ​ |  | 1,032 | ​ |  | 1,965 | ​
Net cash used in financing activities | ​ |  | (214,503) | ​ |  | (118,771) | ​ |  | (71,114) | ​
Net increase (decrease) in cash and cash equivalents | ​ |  | 596 | ​ |  | (4,787) | ​ |  | (1,896) | ​
Cash and cash equivalents at beginning of period | ​ |  | 21,092 | ​ |  | 25,879 | ​ |  | 27,775 | ​
Cash and cash equivalents at end of period | ​ | $ | 21,688 | ​ | $ | 21,092 | ​ | $ | 25,879 | ​

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