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Common stock (Tables) | 12 Months Ended
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Dec. 31, 2014
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, 2014:
(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, 2012 |  |  | 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 |
Conversions |  |  | - |  |  | (11,504) |  |  | 11,503 |  |  | - |  |  | (1) |
Repurchase of common stock |  |  | - |  |  | - |  |  | (1,083) |  |  | - |  |  | (1,083) |
Restricted stock issued - directors |  |  | - |  |  | - |  |  | 28,500 |  |  | - |  |  | 28,500 |
Exercised stock options - compensation plans |  |  | - |  |  | - |  |  | 276,079 |  |  | - |  |  | 276,079 |
Restricted stock units - vested |  |  | - |  |  | - |  |  | 124,490 |  |  | - |  |  | 124,490 |
Outstanding at December 31, 2013 |  |  | 6,342,189 |  |  | 2,520,422 |  |  | 29,710,556 |  |  | - |  |  | 38,573,167 |
Conversions |  |  | - |  |  | (20,208) |  |  | 20,208 |  |  | - |  |  | - |
Repurchase of common stock |  |  | - |  |  | (21,164) |  |  | (2,110) |  |  | - |  |  | (23,274) |
Restricted stock issued - directors |  |  | - |  |  | - |  |  | 28,500 |  |  | - |  |  | 28,500 |
Exercised stock options - compensation plans |  |  | - |  |  | - |  |  | 111,427 |  |  | - |  |  | 111,427 |
Restricted stock units - vested |  |  | - |  |  | - |  |  | 87,519 |  |  | - |  |  | 87,519 |
Outstanding at December 31, 2014 |  |  | 6,342,189 |  |  | 2,479,050 |  |  | 29,956,100 |  |  | - |  |  | 38,777,339 |
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:
|  | “Class A” |  | “Class B” |  | “Class E” |  | Total |
|  | Shares |  | Amount |  | Shares |  | Amount |  | Shares |  | Amount |  | Shares |  | Amount |
Outstanding at January 1, 2012 |  |  | 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 |
Repurchase of common stock |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 1,083 |  |  | 27 |  |  | 1,083 |  |  | 27 |
Restricted stock issued - directors |  |  | - |  |  | - |  |  | - |  |  | - |  |  | (28,500) |  |  | (629) |  |  | (28,500) |  |  | (629) |
Exercised stock options - compensation plans |  |  | - |  |  | - |  |  | - |  |  | - |  |  | (276,079) |  |  | (6,094) |  |  | (276,079) |  |  | (6,094) |
Restricted stock units - vested |  |  | - |  |  | - |  |  | - |  |  | - |  |  | (124,490) |  |  | (2,748) |  |  | (124,490) |  |  | (2,748) |
Outstanding at December 31, 2013 |  |  | 318,140 |  |  | 10,708 |  |  | 568,010 |  |  | 15,655 |  |  | 2,520,522 |  |  | 55,645 |  |  | 3,406,672 |  |  | 82,008 |
Repurchase of common stock |  |  | - |  |  | - |  |  | 21,164 |  |  | 587 |  |  | 2,110 |  |  | 53 |  |  | 23,274 |  |  | 640 |
Restricted stock issued - directors |  |  | - |  |  | - |  |  | - |  |  | - |  |  | (28,500) |  |  | (629) |  |  | (28,500) |  |  | (629) |
Exercised stock options - compensation plans |  |  | - |  |  | - |  |  | - |  |  | - |  |  | (111,427) |  |  | (2,460) |  |  | (111,427) |  |  | (2,460) |
Restricted stock units - vested |  |  | - |  |  | - |  |  | - |  |  | - |  |  | (87,519) |  |  | (1,932) |  |  | (87,519) |  |  | (1,932) |
Outstanding at December 31, 2014 |  |  | 318,140 |  |  | 10,708 |  |  | 589,174 |  |  | 16,242 |  |  | 2,295,186 |  |  | 50,677 |  |  | 3,202,500 |  |  | 77,627 |

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: 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 2: 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 3: 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 Reference 4: 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 + Details
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