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Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands | Total | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Cumulative effect of accounting change | $ (29,252) |  |  |  | $ (29,252) |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance | 3,882,416 | $ 144,486 | $ 642 | $ 983,250 | 2,638,282 | $ 267,370 | $ (151,614)
Total shareholders’ equity at beginning of period at Dec. 31, 2019 | 3,911,668 | 144,486 | 642 | 983,250 | 2,667,534 | 267,370 | (151,614)
Total shareholders’ equity at end of period at Mar. 31, 2020 | 3,826,666 | 0 | 642 | 985,762 | 2,635,588 | 363,815 | (159,141)
Total shareholders’ equity at beginning of period at Dec. 31, 2019 | 3,911,668 | 144,486 | 642 | 983,250 | 2,667,534 | 267,370 | (151,614)
Net income | 147,825 |  |  |  | 147,825 |  |
Other comprehensive income (loss) | 220,894 |  |  |  |  | 220,894 |
Stock option exercises/stock unit conversions (114,252 shares QTD and 628,076 shares YTD in 2021 and 77,308 shares QTD and 143,523 shares YTD in 2020) | 4,846 |  |  |  | (9,125) |  | 13,971
Stock compensation expense recognized in earnings | 5,784 |  |  | 5,784 |  |  |
Preferred stock, redemption amount (6,000,000 shares) | (150,000) | (144,486) |  |  | (5,514) |  |
Purchase of treasury stock (11,625 shares YTD in 2021 and 181,825 shares YTD in 2020) | (13,973) |  |  |  |  |  | (13,973)
Treasury stock issued to the 401(k) stock purchase plan (18,555 shares YTD in 2021 and 38,943 shares YTD in 2020) | 2,830 |  |  |  | (961) |  | 3,791
Cash dividends – preferred stock (approximately $11.13 per share which is equivalent to approximately $0.28 per depository share QTD and $25.46 per share which is equivalent to approximately $0.64 per depository share YTD in 2021 and $0.34 per share YTD in 2020) | (2,016) |  |  |  | (2,016) |  |
Cash dividends – common stock ($0.72 per share QTD and $1.44 per share YTD in 2021 and $0.71 per share QTD and $1.42 per share YTD in 2020) | (89,805) |  |  |  | (89,805) |  |
Total shareholders’ equity at end of period at Jun. 30, 2020 | 4,008,801 | 0 | 642 | 989,034 | 2,678,686 | 488,264 | (147,825)
Total shareholders’ equity at beginning of period at Mar. 31, 2020 | 3,826,666 | 0 | 642 | 985,762 | 2,635,588 | 363,815 | (159,141)
Net income | 93,072 |  |  |  | 93,072 |  |
Other comprehensive income (loss) | 124,449 |  |  |  |  | 124,449 |
Stock option exercises/stock unit conversions (114,252 shares QTD and 628,076 shares YTD in 2021 and 77,308 shares QTD and 143,523 shares YTD in 2020) | 3,383 |  |  |  | (4,142) |  | 7,525
Stock compensation expense recognized in earnings | 3,272 |  |  | 3,272 |  |  |
Treasury stock issued to the 401(k) stock purchase plan (18,555 shares YTD in 2021 and 38,943 shares YTD in 2020) | 2,830 |  |  |  | (961) |  | 3,791
Cash dividends – common stock ($0.72 per share QTD and $1.44 per share YTD in 2021 and $0.71 per share QTD and $1.42 per share YTD in 2020) | (44,871) |  |  |  | (44,871) |  |
Total shareholders’ equity at end of period at Jun. 30, 2020 | 4,008,801 | 0 | 642 | 989,034 | 2,678,686 | 488,264 | (147,825)
Total shareholders’ equity at beginning of period at Dec. 31, 2020 | 4,293,016 | 145,452 | 642 | 997,168 | 2,750,723 | 512,970 | (113,939)
Net income | 234,083 |  |  |  | 234,083 |  |
Other comprehensive income (loss) | (99,980) |  |  |  |  | (99,980) |
Stock option exercises/stock unit conversions (114,252 shares QTD and 628,076 shares YTD in 2021 and 77,308 shares QTD and 143,523 shares YTD in 2020) | 36,682 |  |  |  | (25,567) |  | 62,249
Stock compensation expense recognized in earnings | 5,771 |  |  | 5,771 |  |  |
Purchase of treasury stock (11,625 shares YTD in 2021 and 181,825 shares YTD in 2020) | (1,288) |  |  |  |  |  | (1,288)
Treasury stock issued to the 401(k) stock purchase plan (18,555 shares YTD in 2021 and 38,943 shares YTD in 2020) | 1,749 |  |  |  | (57) |  | 1,806
Cash dividends – preferred stock (approximately $11.13 per share which is equivalent to approximately $0.28 per depository share QTD and $25.46 per share which is equivalent to approximately $0.64 per depository share YTD in 2021 and $0.34 per share YTD in 2020) | (3,820) |  |  |  | (3,820) |  |
Cash dividends – common stock ($0.72 per share QTD and $1.44 per share YTD in 2021 and $0.71 per share QTD and $1.42 per share YTD in 2020) | (92,396) |  |  |  | (92,396) |  |
Total shareholders’ equity at end of period at Jun. 30, 2021 | 4,373,817 | 145,452 | 642 | 1,002,939 | 2,862,966 | 412,990 | (51,172)
Total shareholders’ equity at beginning of period at Mar. 31, 2021 | 4,267,918 | 145,452 | 642 | 999,694 | 2,797,064 | 387,748 | (62,682)
Net income | 118,068 |  |  |  | 118,068 |  |
Other comprehensive income (loss) | 25,242 |  |  |  |  | 25,242 |
Stock option exercises/stock unit conversions (114,252 shares QTD and 628,076 shares YTD in 2021 and 77,308 shares QTD and 143,523 shares YTD in 2020) | 7,285 |  |  |  | (4,225) |  | 11,510
Stock compensation expense recognized in earnings | 3,245 |  |  | 3,245 |  |  |
Cash dividends – preferred stock (approximately $11.13 per share which is equivalent to approximately $0.28 per depository share QTD and $25.46 per share which is equivalent to approximately $0.64 per depository share YTD in 2021 and $0.34 per share YTD in 2020) | (1,669) |  |  |  | (1,669) |  |
Cash dividends – common stock ($0.72 per share QTD and $1.44 per share YTD in 2021 and $0.71 per share QTD and $1.42 per share YTD in 2020) | (46,272) |  |  |  | (46,272) |  |
Total shareholders’ equity at end of period at Jun. 30, 2021 | $ 4,373,817 | $ 145,452 | $ 642 | $ 1,002,939 | $ 2,862,966 | $ 412,990 | $ (51,172)

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
Name: | us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration