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PARENT COMPANY FINANCIAL INFORMATION (Tables) - Parent Company | 12 Months Ended
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Dec. 31, 2020
Financial Information for the Parent Company - Balance Sheets | Financial information for the Parent Company is as follows: PARENT COMPANY CONDENSED BALANCE SHEETS AS OF DECEMBER 31, 2020 and 2019 (Dollars in thousands) ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
ASSETS |  | ​ |  |  | ​ |
Cash | ​ | $ | 116,748 | ​ | $ | 5,283
Premises and equipment, net | ​ |  | 10,435 | ​ |  | 10,568
Other assets | ​ |  | 30,429 | ​ |  | 27,438
Investment in subsidiaries | ​ |  | 2,858,608 | ​ |  | 2,786,842
Total assets | ​ | $ | 3,016,220 | ​ | $ | 2,830,131
LIABILITIES AND STOCKHOLDERS' EQUITY | ​ |  |  | ​ |  |
Long-term borrowings | ​ | $ | 148,806 | ​ | $ | 157,155
Trust preferred capital notes | ​ |  | 141,023 | ​ |  | 140,237
Other liabilities | ​ |  | 17,901 | ​ |  | 19,637
Total liabilities | ​ |  | 307,730 | ​ |  | 317,029
Total stockholders' equity | ​ |  | 2,708,490 | ​ |  | 2,513,102
Total liabilities and stockholders' equity | ​ | $ | 3,016,220 | ​ | $ | 2,830,131
Financial Information for the Parent Company - Statements of Income and Comprehensive Income | PARENT COMPANY CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME YEARS ENDED DECEMBER 31, 2020, 2019, and 2018 (Dollars in thousands) ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | ​ | 2018
Income: |  | ​ |  |  | ​ |  |  | ​ |
Interest and dividend income | ​ | $ | — | ​ | $ | 3 | ​ | $ | —
Dividends received from subsidiaries | ​ |  | 97,880 | ​ |  | 160,033 | ​ |  | 50,750
Other operating income | ​ |  | 1,338 | ​ |  | 1,484 | ​ |  | 2,719
Total income | ​ |  | 99,218 | ​ |  | 161,520 | ​ |  | 53,469
Expenses: | ​ |  |  | ​ |  |  | ​ |  |
Interest expense | ​ |  | 13,506 | ​ |  | 15,935 | ​ |  | 15,253
Other operating expenses | ​ |  | 8,249 | ​ |  | 11,434 | ​ |  | 13,782
Total expenses | ​ |  | 21,755 | ​ |  | 27,369 | ​ |  | 29,035
Income before income taxes and equity in undistributed net income from subsidiaries | ​ |  | 77,463 | ​ |  | 134,151 | ​ |  | 24,434
Income tax benefit | ​ |  | (5,439) | ​ |  | (6,499) | ​ |  | (6,176)
Equity in undistributed net income from subsidiaries | ​ |  | 75,326 | ​ |  | 52,878 | ​ |  | 115,638
Net income | ​ | $ | 158,228 | ​ | $ | 193,528 | ​ | $ | 146,248
Comprehensive income | ​ | $ | 193,668 | ​ | $ | 239,376 | ​ | $ | 136,905
Financial Information for the Parent Company - Statements of Cash Flows | PARENT COMPANY CONDENSED STATEMENTS OF CASH FLOWS YEARS ENDED DECEMBER 31, 2020, 2019, and 2018 (Dollars in thousands) ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Operating activities: |  | ​ |  |  | ​ |  |  | ​ |
Net income | ​ | $ | 158,228 | ​ | $ | 193,528 | ​ | $ | 146,248
Adjustments to reconcile net income to net cash provided by operating activities: | ​ |  |  | ​ |  |  | ​ |  |
Equity in undistributed net income of subsidiaries | ​ |  | (75,326) | ​ |  | (52,878) | ​ |  | (115,638)
Depreciation of premises and equipment | ​ |  | 439 | ​ |  | 424 | ​ |  | 424
Acquisition accounting amortization, net | ​ |  | 735 | ​ |  | 662 | ​ |  | 636
Gain on sale of investment | ​ |  | — | ​ |  | — | ​ |  | (1,416)
Issuance of common stock for services | ​ |  | 804 | ​ |  | 910 | ​ |  | 914
Net increase in other assets | ​ |  | (3,005) | ​ |  | (3,256) | ​ |  | (584)
Net increase (decrease) in other liabilities | ​ |  | 10,038 | ​ |  | 4,964 | ​ |  | (4,159)
Net cash provided by (used in) operating activities | ​ |  | 91,913 | ​ |  | 144,354 | ​ |  | 26,425
Investing activities: | ​ |  |  | ​ |  |  | ​ |  |
Net increase in premises and equipment | ​ |  | (306) | ​ |  | (355) | ​ |  | —
Proceeds from sale of investment | ​ |  | — | ​ |  | — | ​ |  | 3,761
Increase in equity method investments | ​ | ​ | (2,353) | ​ | ​ | — | ​ | ​ | —
Cash paid in acquisitions | ​ | ​ | — | ​ | ​ | (12) | ​ | ​ | —
Cash received in acquisitions | ​ |  | — | ​ |  | 21,553 | ​ |  | 25,976
Net cash provided by (used in) investing activities | ​ |  | (2,659) | ​ |  | 21,186 | ​ |  | 29,737
Financing activities: | ​ |  |  | ​ |  |  | ​ |  |
Net increase (decrease) in short-term borrowings | ​ |  | — | ​ |  | (5,000) | ​ |  | 5,000
Repayments of long-term borrowings | ​ |  | (8,500) | ​ |  | — | ​ |  | —
Cash dividends paid - common stock | ​ |  | (78,860) | ​ |  | (78,345) | ​ |  | (58,001)
Cash dividends paid - preferred stock | ​ | ​ | (5,658) | ​ | ​ | — | ​ | ​ | —
Cancellation of warrants | ​ |  | — | ​ |  | — | ​ |  | (1,530)
Issuance (repurchase) of common stock | ​ |  | (48,866) | ​ |  | (78,292) | ​ |  | 2,347
Issuance of preferred stock, net | ​ | ​ | 166,356 | ​ | ​ | — | ​ | ​ | —
Vesting of restricted stock, net of shares held for taxes | ​ |  | (2,261) | ​ |  | (2,301) | ​ |  | (2,908)
Net cash provided by (used in) financing activities | ​ |  | 22,211 | ​ |  | (163,938) | ​ |  | (55,092)
Increase (decrease) in cash and cash equivalents | ​ |  | 111,465 | ​ |  | 1,602 | ​ |  | 1,070
Cash, cash equivalents and restricted cash at beginning of the period | ​ |  | 5,283 | ​ |  | 3,681 | ​ |  | 2,611
Cash, cash equivalents and restricted cash at end of the period | ​ | $ | 116,748 | ​ | $ | 5,283 | ​ | $ | 3,681
Supplemental schedule of noncash investing and financing activities | ​ |  |  | ​ |  |  | ​ |  |
Issuance of common stock in exchange for net assets in acquisition | ​ | $ | — | ​ | $ | 499,974 | ​ | $ | 794,809
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Transactions related to bank acquisition | ​ |  |  | ​ |  |  | ​ |  |
Assets acquired | ​ |  | — | ​ |  | 509,075 | ​ |  | 859,176
Liabilities assumed | ​ |  | — | ​ |  | 9,089 | ​ |  | 64,367

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