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Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2019 | $ 315 | $ 226,691 | $ (71,487) | $ 433,960 | $ (9,807) | $ 579,672
Impact of adoption of ASC 326 - Credit Losses |  |  |  | (875) |  | (875)
Net income |  |  |  | (1,390) |  | (1,390)
Award of common shares released from Employee Benefit Trust |  | 1,398 |  |  |  | 1,398
Vesting of restricted stock unit awards |  | (5,626) | 5,782 | (156) |  |
Stock-based compensation expense |  | 3,430 |  |  |  | 3,430
Purchase of treasury shares |  |  | (2,342) |  |  | (2,342)
Repurchase of shares to satisfy tax obligation |  |  | (1,493) |  |  | (1,493)
Dividends on common stock |  |  |  | (6,084) |  | (6,084)
Other comprehensive income (loss) |  |  |  |  | (22,633) | (22,633)
Balance at Mar. 31, 2020 | 315 | 225,893 | (69,540) | 425,455 | (32,440) | 549,683
Balance at Dec. 31, 2019 | 315 | 226,691 | (71,487) | 433,960 | (9,807) | 579,672
Net income |  |  |  |  |  | 31,213
Other comprehensive income (loss) |  |  |  |  | (8,501) | (8,501)
Balance at Sep. 30, 2020 | 315 | 227,877 | (69,409) | 445,931 | (18,308) | 586,406
Balance at Mar. 31, 2020 | 315 | 225,893 | (69,540) | 425,455 | (32,440) | 549,683
Net income |  |  |  | 18,272 |  | 18,272
Award of common shares released from Employee Benefit Trust |  | 40 |  |  |  | 40
Vesting of restricted stock unit awards |  | (133) | 134 | (1) |  |
Stock-based compensation expense |  | 1,101 |  |  |  | 1,101
Repurchase of shares to satisfy tax obligation |  |  | (30) |  |  | (30)
Dividends on common stock |  |  |  | (6,063) |  | (6,063)
Other comprehensive income (loss) |  |  |  |  | 8,918 | 8,918
Balance at Jun. 30, 2020 | 315 | 226,901 | (69,436) | 437,663 | (23,522) | 571,921
Net income |  |  |  | 14,331 |  | 14,331
Award of common shares released from Employee Benefit Trust |  | 31 |  |  |  | 31
Vesting of restricted stock unit awards |  | (34) | 34 |  |  |
Stock-based compensation expense |  | 979 |  |  |  | 979
Purchase of treasury shares |  |  | (7) |  |  | (7)
Dividends on common stock |  |  |  | (6,063) |  | (6,063)
Other comprehensive income (loss) |  |  |  |  | 5,214 | 5,214
Balance at Sep. 30, 2020 | 315 | 227,877 | (69,409) | 445,931 | (18,308) | 586,406
Balance at Dec. 31, 2020 | 341 | 261,533 | (69,400) | 442,789 | (16,266) | 618,997
Net income |  |  |  | 19,039 |  | 19,039
Award of common shares released from Employee Benefit Trust |  | 74 |  |  |  | 74
Vesting of restricted stock unit awards |  | (5,058) | 5,211 | (153) |  |
Stock-based compensation expense |  | 3,470 |  |  |  | 3,470
Repurchase of shares to satisfy tax obligation |  |  | (1,290) |  |  | (1,290)
Dividends on common stock |  |  |  | (6,652) |  | (6,652)
Other comprehensive income (loss) |  |  |  |  | 5,563 | 5,563
Balance at Mar. 31, 2021 | 341 | 260,019 | (65,479) | 455,023 | (10,703) | 639,201
Balance at Dec. 31, 2020 | 341 | 261,533 | (69,400) | 442,789 | (16,266) | 618,997
Net income |  |  |  |  |  | 63,710
Other comprehensive income (loss) |  |  |  |  | 7,332 | 7,332
Balance at Sep. 30, 2021 | 341 | 262,009 | (71,738) | 486,418 | (8,934) | 668,096
Balance at Mar. 31, 2021 | 341 | 260,019 | (65,479) | 455,023 | (10,703) | 639,201
Net income |  |  |  | 19,258 |  | 19,258
Award of common shares released from Employee Benefit Trust |  | 91 |  |  |  | 91
Vesting of restricted stock unit awards |  | (221) | 229 | (8) |  |
Stock-based compensation expense |  | 1,069 |  |  |  | 1,069
Repurchase of shares to satisfy tax obligation |  |  | (85) |  |  | (85)
Dividends on common stock |  |  |  | (6,653) |  | (6,653)
Other comprehensive income (loss) |  |  |  |  | 2,286 | 2,286
Balance at Jun. 30, 2021 | 341 | 260,958 | (65,335) | 467,620 | (8,417) | 655,167
Net income |  |  |  | 25,413 |  | 25,413
Award of common shares released from Employee Benefit Trust |  | 74 |  |  |  | 74
Stock-based compensation expense |  | 977 |  |  |  | 977
Purchase of treasury shares |  |  | (6,403) |  |  | (6,403)
Dividends on common stock |  |  |  | (6,615) |  | (6,615)
Other comprehensive income (loss) |  |  |  |  | (517) | (517)
Balance at Sep. 30, 2021 | $ 341 | $ 262,009 | $ (71,738) | $ 486,418 | $ (8,934) | $ 668,096

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