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Common stock (Tables) | 12 Months Ended
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Dec. 31, 2012
Equity [Abstract] |
Schedule of Common Stock Outstanding Roll Forward [Table Text Block] | The following table provides detailed information on the Bank’s common stock activity per class for each of the years in the three-year period ended December 31, 2012:
(Share units) |  | “Class A” |  |  | “Class B” |  |  | “Class E” |  |  | “Class F” |  |  | Total |
Authorized |  |  | 40,000,000 |  |  |  | 40,000,000 |  |  |  | 100,000,000 |  |  |  | 100,000,000 |  |  |  | 280,000,000 |
Outstanding at January 1, 2010 |  |  | 6,342,189 |  |  |  | 2,584,882 |  |  |  | 27,618,545 |  |  |  | - |  |  |  | 36,545,616 |
Conversions |  |  | - |  |  |  | (42,861 | ) |  |  | 42,860 |  |  |  | - |  |  |  | (1 | )
Repurchase of common stock |  |  | - |  |  |  | - |  |  |  | (200 | ) |  |  | - |  |  |  | (200 | )
Restricted stock issued - directors |  |  | - |  |  |  | - |  |  |  | 38,115 |  |  |  | - |  |  |  | 38,115 |
Exercised stock options - compensation plans |  |  | - |  |  |  | - |  |  |  | 82,106 |  |  |  | - |  |  |  | 82,106 |
Restricted stock units - vested |  |  | - |  |  |  | - |  |  |  | 44,904 |  |  |  | - |  |  |  | 44,904 |
Outstanding at December 31, 2010 |  |  | 6,342,189 |  |  |  | 2,542,021 |  |  |  | 27,826,330 |  |  |  | - |  |  |  | 36,710,540 |
Conversions |  |  | - |  |  |  | (10,095 | ) |  |  | 10,095 |  |  |  | - |  |  |  | - |
Restricted stock issued - directors |  |  | - |  |  |  | - |  |  |  | 25,541 |  |  |  | - |  |  |  | 25,541 |
Exercised stock options - compensation plans |  |  | - |  |  |  | - |  |  |  | 325,996 |  |  |  | - |  |  |  | 325,996 |
Restricted stock units - vested |  |  | - |  |  |  | - |  |  |  | 69,865 |  |  |  | - |  |  |  | 69,865 |
Outstanding at December 31, 2011 |  |  | 6,342,189 |  |  |  | 2,531,926 |  |  |  | 28,257,827 |  |  |  | - |  |  |  | 37,131,942 |
Conversions |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Restricted stock issued - directors |  |  | - |  |  |  | - |  |  |  | 32,317 |  |  |  | - |  |  |  | 32,317 |
Exercised stock options - compensation plans |  |  | - |  |  |  | - |  |  |  | 895,674 |  |  |  | - |  |  |  | 895,674 |
Restricted stock units - vested |  |  | - |  |  |  | - |  |  |  | 85,249 |  |  |  | - |  |  |  | 85,249 |
Outstanding at December 31, 2012 |  |  | 6,342,189 |  |  |  | 2,531,926 |  |  |  | 29,271,067 |  |  |  | - |  |  |  | 38,145,182 |
Schedule of Treasury Stock by Class [Table Text Block] | The following table presents information regarding shares repurchased but not retired by the Bank and accordingly classified as treasury stock:
(In thousands, except for share data) |  | “Class A” |  |  | “Class B” |  |  | “Class E” |  |  |  |
|  | Shares |  |  | Amount |  |  | Shares |  |  | Amount |  |  | Shares |  |  | Amount |  |  | Shares |  |  | Amount |
Outstanding at January 1, 2010 |  |  | 318,140 |  |  |  | 10,708 |  |  |  | 568,010 |  |  |  | 15,655 |  |  |  | 4,548,075 |  |  |  | 103,239 |  |  |  | 5,434,225 |  |  |  | 129,602 |
Repurchase of common stock |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 200 |  |  |  | 3 |  |  |  | 200 |  |  |  | 3 |
Restricted stock issued - directors |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (38,115 | ) |  |  | (909 | ) |  |  | (38,115 | ) |  |  | (909 | )
Exercised stock options - compensation plans |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (82,106 | ) |  |  | (1,958 | ) |  |  | (82,106 | ) |  |  | (1,958 | )
Restricted stock units - vested |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (44,904 | ) |  |  | (1,071 | ) |  |  | (44,904 | ) |  |  | (1,071 | )
Outstanding at December 31, 2010 |  |  | 318,140 |  |  |  | 10,708 |  |  |  | 568,010 |  |  |  | 15,655 |  |  |  | 4,383,150 |  |  |  | 99,304 |  |  |  | 5,269,300 |  |  |  | 125,667 |
Restricted stock issued - directors |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (25,541 | ) |  |  | (609 | ) |  |  | (25,541 | ) |  |  | (609 | )
Exercised stock options - compensation plans |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (325,996 | ) |  |  | (7,775 | ) |  |  | (325,996 | ) |  |  | (7,775 | )
Restricted stock units - vested |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (69,865 | ) |  |  | (1,666 | ) |  |  | (69,865 | ) |  |  | (1,666 | )
Outstanding at December 31, 2011 |  |  | 318,140 |  |  |  | 10,708 |  |  |  | 568,010 |  |  |  | 15,655 |  |  |  | 3,961,748 |  |  |  | 89,254 |  |  |  | 4,847,898 |  |  |  | 115,617 |
Restricted stock issued - directors |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (32,317 | ) |  |  | (771 | ) |  |  | (32,317 | ) |  |  | (771 | )
Exercised stock options - compensation plans |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (895,674 | ) |  |  | (21,361 | ) |  |  | (895,674 | ) |  |  | (21,361 | )
Restricted stock units - vested |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (85,249 | ) |  |  | (2,033 | ) |  |  | (85,249 | ) |  |  | (2,033 | )
Outstanding at December 31, 2012 |  |  | 318,140 |  |  |  | 10,708 |  |  |  | 568,010 |  |  |  | 15,655 |  |  |  | 2,948,508 |  |  |  | 65,089 |  |  |  | 3,834,658 |  |  |  | 91,452 |

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- Definition Tabular disclosure of an entity's treasury stock, including the average cost per share, carrying basis for each class of treasury stock, description of share repurchase program authorized by an entity's board of directors, the number of shares repurchased, the cost of the shares repurchased, the remaining maximum dollar value of shares available for repurchase under the program, the treatment of the purchase price in excess of the current market value, number of shares held for each class of treasury stock, and other information necessary to a fair presentation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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