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Consolidated Statements of Changes in Shareholders' Equity - USD ($) | Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Preferred Stock [Member] | Common Stock Including Additional Paid in Capital [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2017 | $ (42,000) | $ 42,000 | $ 0 | $ 0 | $ 309,772,000 | $ 61,001,000 | $ (4,903,000) | $ 365,870,000
Employee stock purchase plan |  |  |  |  | 52,000 |  |  | 52,000
Dividend reinvestment plan |  |  |  |  | 1,165,000 |  |  | 1,165,000
Stock option exercises |  |  |  |  | 108,000 |  |  | 108,000
Stock grants to directors for retainer fees |  |  |  |  | 441,000 |  |  | 441,000
Stock-based compensation expense |  |  |  |  | 2,410,000 |  |  | 2,410,000
Share repurchase program |  |  |  |  | (5,943,000) |  |  | (5,943,000)
Cash dividends |  |  |  |  |  | (27,500,000) |  | (27,500,000)
Net income |  |  |  |  |  | 42,024,000 |  | 42,024,000
Change in net unrealized gain/(loss) on securities available for sale, net of tax effect |  |  |  |  |  |  | (3,379,000) | (3,379,000)
Change in fair value of interest rate swap, net of tax effect |  |  |  |  |  |  | 1,000 | 1,000
Balances at Dec. 31, 2018 |  |  |  | 0 | 308,005,000 | 75,483,000 | (8,239,000) | 375,249,000
Employee stock purchase plan |  |  |  |  | 50,000 |  |  | 50,000
Dividend reinvestment plan |  |  |  |  | 729,000 |  |  | 729,000
Stock option exercises |  |  |  |  | 128,000 |  |  | 128,000
Stock grants to directors for retainer fees |  |  |  |  | 375,000 |  |  | 375,000
Stock-based compensation expense |  |  |  |  | 2,931,000 |  |  | 2,931,000
Share repurchase program |  |  |  |  | (7,183,000) |  |  | (7,183,000)
Cash dividends |  |  |  |  |  | (17,108,000) |  | (17,108,000)
Net income |  |  |  |  |  | 49,456,000 |  | 49,456,000
Change in net unrealized gain/(loss) on securities available for sale, net of tax effect |  |  |  |  |  |  | 11,934,000 | 11,934,000
Balances at Dec. 31, 2019 |  |  |  | 0 | 305,035,000 | 107,831,000 | 3,695,000 | 416,561,000
Employee stock purchase plan |  |  |  |  | 49,000 |  |  | 49,000
Dividend reinvestment plan |  |  |  |  | 814,000 |  |  | 814,000
Stock option exercises |  |  |  |  | 3,000 |  |  | 3,000
Stock grants to directors for retainer fees |  |  |  |  |  |  | 394,000 | 394,000
Stock-based compensation expense |  |  |  |  | 2,325,000 |  |  | 2,325,000
Share repurchase program |  |  |  |  | (6,591,000) |  |  | (6,591,000)
Cash dividends |  |  |  |  |  | (17,930,000) |  | (17,930,000)
Net income |  |  |  |  |  | 44,138,000 |  | 44,138,000
Change in net unrealized gain/(loss) on securities available for sale, net of tax effect |  |  |  |  |  |  | 1,791,000 | 1,791,000
Balances at Dec. 31, 2020 |  |  |  | $ 0 | $ 302,029,000 | $ 134,039,000 | $ 5,486,000 | $ 441,554,000

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