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PARENT COMPANY STATEMENTS, Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 18, 2019 | Jul. 12, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating activities: |  |  |  |  |
Net income |  |  | $ 164,676 | $ 169,063 | $ 168,641
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |
Net change in other assets and other liabilities |  |  | (16,939) | 2,545 | 10,252
Net cash provided by operating activities |  |  | 179,483 | 202,502 | 221,408
Investing activities: |  |  |  |  |
Cash received /(paid) for acquisition, net of cash acquired of $55,973, $90,381, and $16, respectively | $ (500) | $ (95,034) | 34,360 | (4,653) | (1,737)
Net cash (used in)/provided by investing activities |  |  | (398,720) | (157,054) | 17,495
Financing activities: |  |  |  |  |
Issuance of common stock |  |  | 15,792 | 6,915 | 6,443
Purchase of treasury stock |  |  | (271) | (286) | (298)
Sale of treasury stock |  |  | 85 | 6,884 | 12,561
Increase in deferred compensation agreements |  |  | 271 | 286 | 298
Net cash provided by/(used in) financing activities |  |  | 1,660,012 | (52,252) | (248,107)
Change in cash and cash equivalents |  |  | 1,440,775 | (6,804) | (9,204)
Cash and cash equivalents at beginning of year |  |  | 205,030 | 211,834 | 221,038
Cash and cash equivalents at end of year |  |  | 1,645,805 | 205,030 | 211,834
Supplemental disclosures of cash flow information: |  |  |  |  |
Cash paid for interest |  |  | 21,169 | 25,425 | 17,926
Supplemental disclosures of noncash financing activities |  |  |  |  |
Dividends declared and unpaid |  |  | 22,695 | 21,342 | 19,808
Common stock issued for acquisition |  |  | 76,942 | 0 | 0
Cash acquired from acquisition |  |  | 55,973 | 90,381 | 16
Parent Company [Member] |  |  |  |  |
Operating activities: |  |  |  |  |
Net income |  |  | 164,676 | 169,063 | 168,641
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |
Equity in undistributed net income of subsidiaries |  |  | (49,789) | (27,753) | (65,026)
Net change in other assets and other liabilities |  |  | 1,740 | 86 | (1,084)
Net cash provided by operating activities |  |  | 116,627 | 141,396 | 102,531
Investing activities: |  |  |  |  |
Proceeds from redemption of investment securities |  |  | 0 | 0 | 776
Purchases of investment securities |  |  | (3,000) | 0 | 0
Cash received /(paid) for acquisition, net of cash acquired of $55,973, $90,381, and $16, respectively |  |  | (20,892) | (92,056) | 0
Return of capital from/(capital contributions to) |  |  | 2 | 100,680 | 0
Net cash (used in)/provided by investing activities |  |  | (23,890) | 8,624 | 776
Financing activities: |  |  |  |  |
Repayment of advances from subsidiaries |  |  | (482) | (1,652) | 0
Repayment of borrowings |  |  | (12,062) | (22,681) | (25,207)
Issuance of common stock |  |  | 22,211 | 12,200 | 12,507
Purchase of treasury stock |  |  | (271) | (286) | (298)
Sale of treasury stock |  |  | 85 | 6,884 | 12,561
Increase in deferred compensation agreements |  |  | 271 | 286 | 298
Cash dividends paid |  |  | (87,131) | (80,241) | (71,495)
Net cash provided by/(used in) financing activities |  |  | (77,379) | (85,490) | (71,634)
Change in cash and cash equivalents |  |  | 15,358 | 64,530 | 31,673
Cash and cash equivalents at beginning of year |  |  | 180,663 | 116,133 | 84,460
Cash and cash equivalents at end of year |  |  | 196,021 | 180,663 | 116,133
Supplemental disclosures of cash flow information: |  |  |  |  |
Cash paid for interest |  |  | 2,555 | 4,306 | 4,857
Supplemental disclosures of noncash financing activities |  |  |  |  |
Dividends declared and unpaid |  |  | 22,695 | 21,342 | 19,808
Advances from subsidiaries |  |  | 932 | 1,691 | 0
Common stock issued for acquisition |  |  | 76,942 | 0 | 0
Cash acquired from acquisition |  |  | $ 448 | $ 1,328 | $ 0

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References No definition available. + Details
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- Definition The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets or underlying collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition The fair value of stock issued in noncash financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 + Details
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