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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Legal Surplus [Member] | Retained Earnings [Member] | Retained Earnings [Member] Cumulative Effect, Period Of Adoption, Adjustment [Member] | Retained Earnings [Member] Cumulative Effect, Period Of Adoption, Adjusted Balance [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss), Net Of Tax [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2017 |  |  | $ 176,000 | $ 52,626 | $ 541,600 | $ 81,454 | $ 200,878 |  | $ 200,878 | $ (104,502) | $ (2,949)
Beginning Balance (Topic 842 Adoption [Member]) at Dec. 31, 2017 |  |  |  |  |  |  |  | $ 0 |  |  |
Beginning Balance (Topic 326 [Member]) at Dec. 31, 2017 |  |  |  |  |  |  |  | 0 |  |  |
Conversion of convertible preferred stock to common stock |  |  | (84,000) | 7,259 | 76,741 |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | 1,401 |  |  |  |  |  |
Lapsed restricted stock units and options |  |  |  |  | (361) |  |  |  |  | 869 |
Net income |  | $ 84,410 |  |  |  |  | 84,410 |  |  |  |
Cash dividends declared on common stock | [1] |  |  |  |  |  | (11,511) |  |  |  |
Cash dividends declared on preferred stock |  |  |  |  |  |  | (12,024) |  |  |  |
Transfer from retained earnings |  |  |  |  |  | 8,713 |  |  |  |  |
Transfer to legal surplus |  |  |  |  |  |  | (8,713) |  |  |  |
Stock repurchased |  | 0 |  |  |  |  |  |  |  | 0 |
Other comprehensive income (loss), net of tax |  | (8,014) |  |  |  |  |  |  |  |  | (8,014)
Ending Balance at Dec. 31, 2018 |  | 999,877 | 92,000 | 59,885 | 619,381 | 90,167 | 253,040 |  | 252,304 | (103,633) | (10,963)
Ending Balance (Topic 842 Adoption [Member]) at Dec. 31, 2018 |  |  |  |  |  |  |  | (736) |  |  |
Ending Balance (Topic 326 [Member]) at Dec. 31, 2018 |  |  |  |  |  |  |  | 0 |  |  |
Stock-based compensation expense |  |  |  |  | 2,134 |  |  |  |  |  |
Lapsed restricted stock units and options |  |  |  |  | 0 |  |  |  |  | 1,294 |
Net income |  | 53,841 |  |  |  |  | 53,841 |  |  |  |
Cash dividends declared on common stock | [1] |  |  |  |  |  | (14,375) |  |  |  |
Cash dividends declared on preferred stock |  |  |  |  |  |  | (6,512) |  |  |  |
Transfer from retained earnings |  |  |  |  |  | 5,612 |  |  |  |  |
Transfer to legal surplus |  |  |  |  |  |  | (5,612) |  |  |  |
Stock repurchased |  | 0 |  |  |  |  |  |  |  | 0 |
Other comprehensive income (loss), net of tax |  | 9,955 |  |  |  |  |  |  |  |  | 9,955
Ending Balance at Dec. 31, 2019 |  | 1,045,478 | 92,000 | 59,885 | 621,515 | 95,779 | 279,646 |  | $ 254,152 | (102,339) | (1,008)
Ending Balance (Topic 842 Adoption [Member]) at Dec. 31, 2019 |  |  |  |  |  |  |  | 0 |  |  |
Ending Balance (Topic 326 [Member]) at Dec. 31, 2019 |  |  |  |  |  |  |  | $ (25,494) |  |  |
Stock-based compensation expense |  |  |  |  | 2,170 |  |  |  |  |  |
Lapsed restricted stock units and options |  |  |  |  | (1,033) |  |  |  |  | 1,616 |
Net income |  | 74,327 |  |  |  |  | 74,327 |  |  |  |
Cash dividends declared on common stock | [1] |  |  |  |  |  | (14,381) |  |  |  |
Cash dividends declared on preferred stock |  |  |  |  |  |  | (6,512) |  |  |  |
Transfer from retained earnings |  |  |  |  |  | 7,490 |  |  |  |  |
Transfer to legal surplus |  |  |  |  |  |  | (7,490) |  |  |  |
Stock repurchased |  | (2,226) |  |  |  |  |  |  |  | (2,226) |
Other comprehensive income (loss), net of tax |  | 12,030 |  |  |  |  |  |  |  |  | 12,030
Ending Balance at Dec. 31, 2020 |  | $ 1,085,975 | $ 92,000 | $ 59,885 | $ 622,652 | $ 103,269 | $ 300,096 |  |  | $ (102,949) | $ 11,022
[1] | [1] Dividends declared per common share during the year ended December 31, 2020 - $0.28 (2019 - $0.28; 2018 - $0.25).

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