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PARENT COMPANY STATEMENTS - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 18, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating activities: |  |  |  |
Net income |  | $ 189,694 | $ 164,676 | $ 169,063
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |
Net change in other assets and other liabilities |  | 2,064 | (16,939) | 2,545
Net cash provided by operating activities |  | 202,546 | 179,483 | 202,502
Investing activities: |  |  |  |
Cash paid for acquisitions, net of cash acquired of $0, $448, and $1,328, respectively | $ (500) | (29,329) | 34,360 | (4,653)
Net cash used in investing activities |  | (1,530,775) | (398,720) | (157,054)
Financing activities: |  |  |  |
Issuance of common stock |  | 9,821 | 15,792 | 6,915
Purchase of treasury stock |  | (5,106) | (271) | (286)
Sale of treasury stock |  | 0 | 85 | 6,884
Increase in deferred compensation arrangements |  | 252 | 271 | 286
Net cash provided by (used in) financing activities |  | 1,557,488 | 1,660,012 | (52,252)
Change in cash and cash equivalents |  | 229,259 | 1,440,775 | (6,804)
Cash and cash equivalents at beginning of year |  | 1,645,805 | 205,030 | 211,834
Cash and cash equivalents at end of year |  | 1,875,064 | 1,645,805 | 205,030
Supplemental disclosures of cash flow information: |  |  |  |
Cash paid for interest |  | 13,752 | 21,169 | 25,425
Supplemental disclosures of noncash financing activities |  |  |  |
Dividends declared and unpaid |  | 23,235 | 22,695 | 21,342
Common stock issued for acquisition |  | 0 | 76,942 | 0
Parent Company |  |  |  |
Operating activities: |  |  |  |
Net income |  | 189,694 | 164,676 | 169,063
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |
Equity in undistributed net income of subsidiaries |  | (52,648) | (49,789) | (27,753)
Net change in other assets and other liabilities |  | (3,050) | 1,740 | 86
Net cash provided by operating activities |  | 133,996 | 116,627 | 141,396
Investing activities: |  |  |  |
Purchases of investment securities |  | (5,173) | (3,000) | 0
Cash paid for acquisitions, net of cash acquired of $0, $448, and $1,328, respectively |  | 0 | (20,892) | (92,056)
(Capital contributions to)/Return of capital from |  | (12,918) | 2 | 100,680
Net cash used in investing activities |  | (18,091) | (23,890) | 8,624
Financing activities: |  |  |  |
Repayment of advances from subsidiaries |  | (482) | (482) | (1,652)
Repayment of borrowings |  | (77,320) | (12,062) | (22,681)
Issuance of common stock |  | 16,155 | 22,211 | 12,200
Purchase of treasury stock |  | (5,106) | (271) | (286)
Sale of treasury stock |  | 0 | 85 | 6,884
Increase in deferred compensation arrangements |  | 252 | 271 | 286
Cash dividends paid |  | (91,051) | (87,131) | (80,241)
Net cash provided by (used in) financing activities |  | (157,552) | (77,379) | (85,490)
Change in cash and cash equivalents |  | (41,647) | 15,358 | 64,530
Cash and cash equivalents at beginning of year |  | 196,021 | 180,663 | 116,133
Cash and cash equivalents at end of year |  | 154,374 | 196,021 | 180,663
Supplemental disclosures of cash flow information: |  |  |  |
Cash paid for interest |  | 560 | 2,555 | 4,306
Supplemental disclosures of noncash financing activities |  |  |  |
Dividends declared and unpaid |  | 23,235 | 22,695 | 21,342
Advances from subsidiaries |  | 482 | 932 | 1,691
Common stock issued for acquisition |  | $ 0 | $ 76,942 | $ 0

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