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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Series A 3% Preferred Stock [Member] | Series B-1 8.48% Preferred Stock [Member] | Cumulative-Effect Adjustment [Member] | Adjusted Balance [Member] | Preferred Equity [Member] | Preferred Equity [Member] Adjusted Balance [Member] | Common Stock [Member] | Common Stock [Member] Adjusted Balance [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] Adjusted Balance [Member] | Retained Earnings [Member] | Retained Earnings [Member] Series A 3% Preferred Stock [Member] | Retained Earnings [Member] Series B-1 8.48% Preferred Stock [Member] | Retained Earnings [Member] Cumulative-Effect Adjustment [Member] | Retained Earnings [Member] Adjusted Balance [Member] | Accumulated Other Comprehensive Loss [Member] | Accumulated Other Comprehensive Loss [Member] Adjusted Balance [Member] | Treasury Stock [Member] | Treasury Stock [Member] Adjusted Balance [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2019 | $ 438,947 |  |  | $ (8,719) | $ 430,228 | $ 17,328 | $ 17,328 | $ 161 | $ 161 | $ 124,582 | $ 124,582 | $ 313,364 |  |  | $ (8,719) | $ 304,645 | $ (14,513) | $ (14,513) | $ (1,975) | $ (1,975)
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 1,127 |  |  |  |  |  |  |  |  |  |  | 1,127 |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | 12,431 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,431 |  |  |
Purchases of common stock for treasury | (196) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (196) |
Share-based compensation plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 332 |  |  |  |  |  |  |  |  | 332 |  |  |  |  |  |  |  |  |  |
Restricted stock units released |  |  |  |  |  |  |  |  |  | (469) |  |  |  |  |  |  |  |  | 469 |
Cash dividends declared: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends per share |  | $ (1) | $ (364) |  |  |  |  |  |  |  |  |  | $ (1) | $ (364) |  |  |  |  |  |
Common stock dividends per share | (4,164) |  |  |  |  |  |  |  |  |  |  | (4,164) |  |  |  |  |  |  |  |
Balance at Mar. 31, 2020 | 439,393 |  |  |  |  | 17,328 |  | 161 |  | 124,445 |  | 301,243 |  |  |  |  | (2,082) |  | (1,702) |
Balance at Dec. 31, 2019 | 438,947 |  |  | $ (8,719) | $ 430,228 | 17,328 | $ 17,328 | 161 | $ 161 | 124,582 | $ 124,582 | 313,364 |  |  | $ (8,719) | $ 304,645 | (14,513) | $ (14,513) | (1,975) | $ (1,975)
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 12,259 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | 14,017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2020 | 448,045 |  |  |  |  | 17,328 |  | 161 |  | 124,523 |  | 307,845 |  |  |  |  | (496) |  | (1,316) |
Balance at Mar. 31, 2020 | 439,393 |  |  |  |  | 17,328 |  | 161 |  | 124,445 |  | 301,243 |  |  |  |  | (2,082) |  | (1,702) |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 11,132 |  |  |  |  |  |  |  |  |  |  | 11,132 |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | 1,586 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,586 |  |  |
Share-based compensation plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 369 |  |  |  |  |  |  |  |  | 369 |  |  |  |  |  |  |  |  |  |
Restricted stock awards issued |  |  |  |  |  |  |  |  |  | (272) |  |  |  |  |  |  |  |  | 272 |
Stock awards | 95 |  |  |  |  |  |  |  |  | (19) |  |  |  |  |  |  |  |  | 114 |
Cash dividends declared: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends per share |  | (1) | (365) |  |  |  |  |  |  |  |  |  | (1) | (365) |  |  |  |  |  |
Common stock dividends per share | (4,164) |  |  |  |  |  |  |  |  |  |  | (4,164) |  |  |  |  |  |  |  |
Balance at Jun. 30, 2020 | 448,045 |  |  |  |  | 17,328 |  | 161 |  | 124,523 |  | 307,845 |  |  |  |  | (496) |  | (1,316) |
Balance at Dec. 31, 2020 | 468,363 |  |  |  |  | 17,328 |  | 161 |  | 125,118 |  | 324,850 |  |  |  |  | 2,128 |  | (1,222) |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 20,710 |  |  |  |  |  |  |  |  |  |  | 20,710 |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | (12,700) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,700) |  |  |
Common stock issued | 301 |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  | 298 |
Purchases of common stock for treasury | (5,963) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,963) |
Purchases of 8.48% preferred stock | (6) |  |  |  |  | (6) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 216 |  |  |  |  |  |  |  |  | 216 |  |  |  |  |  |  |  |  |  |
Restricted stock units released |  |  |  |  |  |  |  |  |  | (446) |  |  |  |  |  |  |  |  | 446 |
Cash dividends declared: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends per share |  | (1) | (364) |  |  |  |  |  |  |  |  |  | (1) | (364) |  |  |  |  |  |
Common stock dividends per share | (4,272) |  |  |  |  |  |  |  |  |  |  | (4,272) |  |  |  |  |  |  |  |
Balance at Mar. 31, 2021 | 466,284 |  |  |  |  | 17,322 |  | 161 |  | 124,891 |  | 340,923 |  |  |  |  | (10,572) |  | (6,441) |
Balance at Dec. 31, 2020 | 468,363 |  |  |  |  | 17,328 |  | 161 |  | 125,118 |  | 324,850 |  |  |  |  | 2,128 |  | (1,222) |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 40,910 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | (8,062) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2021 | 487,126 |  |  |  |  | 17,292 |  | 161 |  | 125,253 |  | 356,485 |  |  |  |  | (5,934) |  | (6,131) |
Balance at Mar. 31, 2021 | 466,284 |  |  |  |  | 17,322 |  | 161 |  | 124,891 |  | 340,923 |  |  |  |  | (10,572) |  | (6,441) |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 20,200 |  |  |  |  |  |  |  |  |  |  | 20,200 |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | 4,638 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,638 |  |  |
Purchases of common stock for treasury | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |
Purchases of 8.48% preferred stock | (37) |  |  |  |  | (30) |  |  |  | (7) |  |  |  |  |  |  |  |  |  |
Share-based compensation plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 562 |  |  |  |  |  |  |  |  | 562 |  |  |  |  |  |  |  |  |  |
Restricted stock awards issued |  |  |  |  |  |  |  |  |  | (223) |  |  |  |  |  |  |  |  | 223 |
Stock awards | 118 |  |  |  |  |  |  |  |  | 30 |  |  |  |  |  |  |  |  | 88 |
Cash dividends declared: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends per share |  | $ (1) | $ (365) |  |  |  |  |  |  |  |  |  | $ (1) | $ (365) |  |  |  |  |  |
Common stock dividends per share | (4,272) |  |  |  |  |  |  |  |  |  |  | (4,272) |  |  |  |  |  |  |  |
Balance at Jun. 30, 2021 | $ 487,126 |  |  |  |  | $ 17,292 |  | $ 161 |  | $ 125,253 |  | $ 356,485 |  |  |  |  | $ (5,934) |  | $ (6,131) |

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