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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Preferred Stock [Member] | Common Stock [Member] | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Treasury Stock [Member] | AOCI Attributable to Parent [Member] | AOCI Attributable to Parent [Member] Cumulative Effect, Period of Adoption, Adjustment | AOCI Including Portion Attributable to Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 |  | $ 0 | $ 307,726 | $ 561,908 | $ 3,806 | $ (87,079) | $ (26,454) | $ (3,806) |
Beginning balance (Adjustments for New Accounting Pronouncement [Member]) at Dec. 31, 2017 |  |  |  | 563,825 |  |  | (27,449) |  |
Beginning balance (Accounting Standards Update 2016-01 [Member]) at Dec. 31, 2017 |  |  |  | 1,917 |  |  |  |  | $ (995)
Beginning balance, shares at Dec. 31, 2017 |  | 0 | 15,288,194 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | $ 110,387 |  |  | 110,387 |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | $ (18,533) |  |  |  |  |  | (18,533) |  |
Dividends, Common Stock, Cash |  |  |  | 63,555 |  |  |  |  |
Stock Issued During Period, Shares, Dividend Reinvestment Plan |  |  | 44 |  |  |  |  |  |
Stock Issued During Period, Value, Dividend Reinvestment Plan |  |  | $ 4 |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions | 435,457 |  | 435,457 |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  | $ 48,519 |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ 4,000 |  | $ 3,954 |  |  |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  |  | 12,921 |  |  |  |  |  |
Stock Granted, Value, Share-based Compensation, Net of Forfeitures |  |  | $ 1,597 | 317 |  | 1,304 |  |  |
Treasury Stock, Shares, Acquired |  |  | 50,000 |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  | (5,784) |  |  |
Treasury Stock Reissued Shares For Director Grants | 11,650 |  | 11,650 |  |  |  |  |  |
Treasury shares reissued for director grants |  |  |  | 77 |  | 1,186 |  |  |
Ending balance, shares at Dec. 31, 2018 |  | 0 | 15,698,178 |  |  |  |  |  |
Ending balance at Dec. 31, 2018 |  | $ 0 | $ 358,598 | 614,069 |  | (90,373) | (49,788) |  |
Ending balance (Adjustments for New Accounting Pronouncement [Member]) at Dec. 31, 2018 |  |  |  | 613,926 |  |  |  |  |
Ending balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018 |  |  |  | (143) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 4.07 |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | $ 102,700 |  |  | 102,700 |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | $ 40,199 |  |  |  |  |  | 40,199 |  |
Dividends, Common Stock, Cash |  |  |  | 69,482 |  |  |  |  |
Stock Issued During Period, Shares, Dividend Reinvestment Plan |  |  | 171 |  |  |  |  |  |
Stock Issued During Period, Value, Dividend Reinvestment Plan |  |  | $ 3 |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions | 1,037,205 |  | 1,037,205 |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  | $ 98,275 |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ 5,000 |  | $ 4,999 |  |  |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  |  | 18,983 |  |  |  |  |  |
Stock Granted, Value, Share-based Compensation, Net of Forfeitures |  |  | $ 2,480 | 273 |  | 1,926 |  |  |
Treasury Stock, Shares, Acquired |  |  | 421,253 |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  | (40,535) |  |  |
Treasury Stock Reissued Shares For Director Grants | 13,500 |  | 13,500 |  |  |  |  |  |
Treasury shares reissued for director grants |  |  |  | 24 |  | 1,349 |  |  |
Ending balance, shares at Dec. 31, 2019 |  | 0 | 16,346,442 |  |  |  |  |  |
Ending balance at Dec. 31, 2019 | $ 969,014 | $ 0 | $ 459,389 | 646,847 |  | (127,633) | (9,589) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 4.24 |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | $ 127,923 |  |  | 127,923 |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 15,160 |  |  |  |  |  | 15,160 |  |
Dividends, Common Stock, Cash |  |  |  | 70,601 |  |  |  |  |
Stock Issued During Period, Shares, Dividend Reinvestment Plan |  |  | 36 |  |  |  |  |  |
Stock Issued During Period, Value, Dividend Reinvestment Plan |  |  | $ 3 |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ 6,000 |  | $ 5,998 |  |  |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  |  | 30,341 |  |  |  |  |  |
Stock Granted, Value, Share-based Compensation, Net of Forfeitures |  |  | $ 4,697 | 664 |  | 3,031 |  |  |
Treasury Stock, Shares, Acquired |  |  | 76,000 |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  | (7,507) |  |  |
Treasury Stock Reissued Shares For Director Grants | 13,450 |  | 13,450 |  |  |  |  |  |
Treasury shares reissued for director grants |  |  |  | 69 |  | 1,343 |  |  |
Ending balance, shares at Dec. 31, 2020 |  | 0 | 16,314,197 |  |  |  |  |  |
Ending balance at Dec. 31, 2020 | $ 1,040,256 | $ 0 | $ 460,687 | $ 704,764 |  | $ (130,766) | $ 5,571 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 4.28 |  |  |  |  |  |  |  |

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