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Income taxes - Schedule of Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |
U.S. federal statutory income tax rate | $ 2,348 | $ 9,008 | $ 15,368
U.S. state and local income taxes, net of U.S. federal income tax benefits | 373 | 2,033 | 2,131
Unrecognized tax benefit | 589 | 6 | 1,244
Tax exempt income, net of interest expense | (696) | (528) | (715)
Non-deductible regulatory settlements | 0 | 5,298 | 0
Business promotion and other non-deductible expenses | 577 | 655 | 660
Insurance proceeds, non-taxable | 0 | (65) | (597)
Adjustment to reflect prior year tax return filings | 397 | 256 | (251)
Tax rate change on deferred income taxes | 116 | 241 | 208
Tax rate differential on foreign operations | 145 | (447) | 185
Other | (36) | (282) | (477)
Total | $ 3,813 | $ 16,175 | $ 17,756
U.S. federal statutory income tax rate, percent | 35.00% | 35.00% | 35.00%
U.S. state and local income taxes, net of U.S. federal income tax benefits, percent | 5.50% | 7.90% | 4.90%
Unrecognized tax benefits, percent | 8.80% | 0.00% | 2.80%
Tax exempt income, net of interest expense, percent | (10.40%) | (2.00%) | (1.60%)
Non-deductible regulatory settlements, percent | 0.00% | 20.60% | 0.00%
Business promotion and other non-deductible expenses, percent | 8.60% | 2.50% | 1.50%
Insurance proceeds, non-taxable, percent | 0.00% | (0.30%) | (1.40%)
Adjustment to reflect prior year tax return filings, percent | 5.90% | 1.00% | (0.60%)
Tax rate change on deferred income taxes, percent | 1.70% | 0.90% | 0.50%
Non-U.S. operations, percent | 2.20% | (1.70%) | 0.40%
Other, percent | (0.50%) | (1.10%) | (1.10%)
Total income tax expense, percent | 56.80% | 62.80% | 40.40%

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