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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Preferred Shares | Common Shares | Retained Earnings | AOCI Including Portion Attributable to Noncontrolling Interest [Member] | Treasury Shares | Accumulated Other Comprehensive (Loss) Income | Retained Earnings
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2015 |  | $ 0 | $ 303,966 | $ 507,505 |  | $ (82,473) | $ (15,643) |
Beginning balance, shares at Dec. 31, 2015 |  | 0 | 15,330,815 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | $ 86,135 |  |  | 86,135 |  |  |  |
Other comprehensive (loss) income, net of income tax: |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | $ (2,102) |  |  |  |  |  | (2,102) |
Cash dividends |  |  |  | (57,958) |  |  |  |
Fractional shares issued in dividend reinvestment plan, shares |  |  | (47) |  |  |  |  |
Cash payment for fractional shares in dividend reinvestment plan |  |  | $ (4) |  |  |  |  |
Allocated Share-based Compensation Expense |  |  | $ 1,864 |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 0 |  |  |  |  |
Treasury Stock Reissued Shares For Director Grants | 9,950 |  | 9,950 |  |  |  |  |
Treasury shares reissued for director grants |  |  |  | (51) |  | 1,001 |  |
Ending balance at Dec. 31, 2016 |  | $ 0 | $ 305,826 | 535,631 |  | (81,472) | (17,745) |
Ending balance, shares at Dec. 31, 2016 |  | 0 | 15,340,718 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | $ 84,242 |  |  | 84,242 |  |  |  |
Other comprehensive (loss) income, net of income tax: |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | $ (8,709) |  |  |  |  |  | (8,709) |
Cash dividends |  |  |  | (57,883) |  |  |  |
Fractional shares issued in dividend reinvestment plan, shares |  |  | (55) |  |  |  |  |
Cash payment for fractional shares in dividend reinvestment plan |  |  | $ (6) |  |  |  |  |
Allocated Share-based Compensation Expense |  |  | $ 2,701 |  |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  |  | 6,381 |  |  |  |  |
Stock Granted, Value, Share-based Compensation, Net of Forfeitures |  |  | $ (795) | (197) |  | (645) |  |
Treasury Stock, Shares, Acquired |  |  | (70,000) |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  | 7,378 |  |
Treasury Stock Reissued Shares For Director Grants | 11,150 |  | 11,150 |  |  |  |  |
Treasury shares reissued for director grants |  |  |  | 115 |  | 1,126 |  |
Ending balance at Dec. 31, 2017 | $ 756,101 | $ 0 | $ 307,726 | 561,908 |  | (87,079) | (26,454) |
Ending balance (Adjustments for New Accounting Pronouncement [Member]) at Dec. 31, 2017 |  |  |  | 563,825 |  |  | (27,449) |
Ending balance, shares at Dec. 31, 2017 |  | 0 | 15,288,194 |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  |  | (3,806) |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | Accounting Standards Update 2016-01 [Member] |  |  |  | 1,917 | $ (995) |  | (995) |
Cumulative Effect of New Accounting Principle in Period of Adoption | Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |  |  |  | $ 3,806
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 110,387 |  |  | 110,387 |  |  |  |
Other comprehensive (loss) income, net of income tax: |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (18,533) |  |  |  |  |  | (18,533) |
Cash dividends |  |  |  | (63,555) |  |  |  |
Fractional shares issued in dividend reinvestment plan, shares |  |  | (44) |  |  |  |  |
Cash payment for fractional shares in dividend reinvestment plan |  |  | $ (4) |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  | 435,457 |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  | $ 48,519 |  |  |  |  |
Allocated Share-based Compensation Expense | $ 3,954 |  | 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 at Dec. 31, 2018 | $ 832,506 | $ 0 | $ 358,598 | $ 614,069 |  | $ (90,373) | $ (49,788) |
Ending balance, shares at Dec. 31, 2018 |  | 0 | 15,698,178 |  |  |  |  |

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