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PARENT COMPANY STATEMENTS - CONDENSED STATEMENTS OF CASH FLOWS (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 24,592,000 | $ 22,776,000 | $ 19,670,000 | $ 17,299,000 | $ 22,198,000 | $ 21,454,000 | $ 21,713,000 | $ 21,682,000 | $ 84,337,000 | $ 87,047,000 | $ 80,411,000
Adjustments to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Net cash from operating activities |  |  |  |  |  |  |  |  |  | 87,228,000 | 100,039,000 | 104,975,000
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock | $ (928,000) |  |  |  |  |  |  |  |  | (10,547,000) | (515,000) | (463,000)
Sales of treasury stock |  |  |  |  |  |  |  |  |  | 119,000 | 118,000 | 115,000
Net cash from financing activities |  |  |  |  |  |  |  |  |  | 775,342,000 | (48,887,000) | 102,209,000
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  | 150,546,000 | (117,541,000) | 40,742,000
Cash and cash equivalents at beginning of the year |  |  |  |  | 99,381,000 |  |  |  | 216,922,000 | 99,381,000 | 216,922,000 | 176,180,000
Cash and cash equivalents at end of the year | 99,381,000 | 249,927,000 |  |  |  | 99,381,000 |  |  |  | 249,927,000 | 99,381,000 | 216,922,000
Reportable Legal Entities | Parent Company |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 84,337,000 | 87,047,000 | 80,411,000
Adjustments to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  |  | (53,828,000) | (32,533,000) | (56,567,000)
Other changes |  |  |  |  |  |  |  |  |  | 1,257,000 | 3,529,000 | 7,294,000
Net cash from operating activities |  |  |  |  |  |  |  |  |  | 31,766,000 | 58,043,000 | 31,138,000
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  |  |  | (30,928,000) |
Proceeds from short-term borrowings |  |  |  |  |  |  |  |  |  | 10,500,000 |  |
Payments related to equity incentive plans |  |  |  |  |  |  |  |  |  | (2,137,000) | (2,109,000) | (2,435,000)
Purchase of treasury stock |  |  |  |  |  |  |  |  |  | (10,547,000) | (515,000) | (463,000)
Sales of treasury stock |  |  |  |  |  |  |  |  |  | 119,000 | 118,000 | 115,000
Dividends paid |  |  |  |  |  |  |  |  |  | (30,566,000) | (29,639,000) | (25,278,000)
Net cash from financing activities |  |  |  |  |  |  |  |  |  | (32,631,000) | (63,073,000) | (28,061,000)
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  | (865,000) | (5,030,000) | 3,077,000
Cash and cash equivalents at beginning of the year |  |  |  |  | $ 3,866,000 |  |  |  | $ 8,896,000 | 3,866,000 | 8,896,000 | 5,819,000
Cash and cash equivalents at end of the year | $ 3,866,000 | $ 3,001,000 |  |  |  | $ 3,866,000 |  |  |  | $ 3,001,000 | $ 3,866,000 | $ 8,896,000

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