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Parent Company Statement of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net Income (Loss) Attributable to Parent | $ 23,936 | $ 31,146 | $ 22,163 | $ 25,455 | $ 26,261 | $ 24,762 | $ 28,241 | $ 31,123 | $ 102,700 | $ 110,387 | $ 84,242 |
Share-based Payment Arrangement, Noncash Expense |  |  |  |  |  |  |  |  | 6,324 | 5,063 | 3,942 |
Debt and Equity Securities, Unrealized Gain (Loss) |  |  |  |  |  |  |  |  | (4,204) | (3,267) | 0 |
Increase (Decrease) in Other Operating Assets |  |  |  |  |  |  |  |  | (12,305) | (9,413) | 1,155 |
Increase (Decrease) in Other Operating Liabilities |  |  |  |  |  |  |  |  | (3,781) | 5,131 | (11,778) |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 111,014 | 131,797 | 86,686 |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  |  |  | 28,630 | 30,684 | 0 |
Other investing activities, net |  |  |  |  |  |  |  |  | 5,723 | 60 | 0 |
Net cash used in investing activities |  |  |  |  |  |  |  |  | 60,079 | 45,445 | (60,666) |
Repayments of Subordinated Debt |  |  |  |  |  |  |  |  | 0 | 0 | 30,000 |
Proceeds from Issuance of Long-term Debt |  |  |  |  |  |  |  |  | 50,000 | 50,000 | 150,000 |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  | 257,500 | 150,000 | 350,000 |
Payments Related to Tax Withholding for Share-based Compensation |  |  |  |  |  |  |  |  | 827 | 610 | 347 |
Net cash (used in) provided by financing activities |  |  |  |  |  |  |  |  | (178,351) | (179,140) | (3,354) |
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (7,258) | (1,898) | 22,666 |
Treasury Stock, Common [Member] |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Equity |  |  |  |  |  |  |  |  | 40,535 | 5,784 | 7,378 |
Parent Company |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  | 102,700 | 110,387 | 84,242 |
Undistributed Losses Of Subsidiaries |  |  |  |  |  |  |  |  | 16,828 | 14,270 | 26,699 |
Compensation expense for issuance of treasury shares to directors |  |  |  |  |  |  |  |  | 1,325 | 1,109 | 1,241 |
Share-based Payment Arrangement, Noncash Expense |  |  |  |  |  |  |  |  | 4,999 | 3,954 | 2,701 |
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments |  |  |  |  |  |  |  |  | 0 | 0 | (1,821) |
Increase (Decrease) in Other Operating Assets |  |  |  |  |  |  |  |  | 8,544 | 2,073 | (205) |
Increase (Decrease) in Other Operating Liabilities |  |  |  |  |  |  |  |  | 10,006 | (163) | 475 |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 89,454 | 95,677 | 60,344 |
Proceeds from Sale of Available-for-sale Securities, Equity |  |  |  |  |  |  |  |  | 0 | 0 | 2,265 |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (22,907) | (30,624) | 2,265 |
Payments of Dividends |  |  |  |  |  |  |  |  | 69,113 | 63,013 | 57,493 |
Proceeds from Issuance of Long-term Debt |  |  |  |  |  |  |  |  | 50,000 |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  | (7,500) |  |  |
Cash Payment For Fractional Shares |  |  |  |  |  |  |  |  | 3 | 4 | 6 |
Payments Related to Tax Withholding for Share-based Compensation |  |  |  |  |  |  |  |  | (827) | (610) | (347) |
Net cash (used in) provided by financing activities |  |  |  |  |  |  |  |  | (67,978) | (69,411) | (95,224) |
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (1,431) | (4,358) | (32,615) |
Cash | $ 73,663 |  |  |  | $ 75,094 |  |  |  | $ 73,663 | $ 75,094 | $ 79,452 | $ 112,067

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