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Goodwill and Other Intangible Assets (Tables)
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12 Months Ended |
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Dec. 31, 2013
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| Goodwill and Other Intangible Assets [Abstract] |
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| Summary of core deposit intangibles and other intangibles |
| | | | 2013 | | | 2012 | | 2011 | | | | ($ in Thousands) | | Core deposit intangibles: | | | | | | | | | | Gross carrying amount | | $ | 36,230 | | $ | 41,831 | $ | 41,831 | | Accumulated amortization | | | (31,565) | | | (34,044) | | (30,815) | | Net book value | | $ | 4,665 | | $ | 7,787 | $ | 11,016 | | Amortization during the year | | $ | 3,122 | | $ | 3,229 | $ | 3,695 | | Other intangibles: | | | | | | | | | | Gross carrying amount | | $ | 19,283 | | $ | 19,283 | $ | 19,283 | | Accumulated amortization | | | (12,764) | | | (11,843) | | (10,877) | | Net book value | | $ | 6,519 | | $ | 7,440 | $ | 8,406 | | Amortization during the year | | $ | 921 | | $ | 966 | $ | 1,019 |
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| Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance |
| | | 2013 | | 2012 | | | 2011 | | | | | ($ in Thousands) | | | Mortgage servicing rights | | | | | | | | | | | Mortgage servicing rights at beginning of year | $ | 61,425 | | $ | 75,855 | | $ | 84,209 | | | | Additions | | 18,256 | | | 23,528 | | | 17,476 | | | | Amortization | | (15,488) | | | (23,348) | | | (25,830) | | | | Other-than-temporary impairment | | ― | | | (14,610) | | | ― | | | Mortgage servicing rights at end of year | $ | 64,193 | | $ | 61,425 | | $ | 75,855 | | | Valuation allowance at beginning of year | | (15,476) | | | (27,703) | | | (20,300) | | | | (Additions) recoveries, net | | 14,563 | | | (2,383) | | | (7,403) | | | | Other-than-temporary impairment | | ― | | | 14,610 | | | ― | | | Valuation allowance at end of year | | (913) | | | (15,476) | | | (27,703) | | | Mortgage servicing rights, net | $ | 63,280 | | $ | 45,949 | | $ | 48,152 | | | Fair value of mortgage servicing rights | $ | 74,444 | | $ | 45,949 | | $ | 48,152 | | | Portfolio of residential mortgage loans serviced for others | | | | | | | | | | | | ("servicing portfolio") | $ | 8,084,000 | | $ | 7,453,000 | | $ | 7,321,000 | | | Mortgage servicing rights, net to servicing portfolio | | 0.78 | % | | 0.62 | % | | 0.66 | % | | Mortgage servicing rights expense(1) | $ | 925 | | $ | 25,731 | | $ | 33,233 | |
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| Summary of estimated future amortization expense |
| Estimated Amortization Expense | Core Deposit | | Other | | | Mortgage Servicing | | | Intangibles | | Intangibles | | | Rights | | Year ending December 31, | | ($ in Thousands) | | 2014 | $ | 2,868 | | $ | 879 | | $ | 10,009 | | 2015 | | 1,404 | | | 839 | | | 8,412 | | 2016 | | 281 | | | 803 | | | 7,058 | | 2017 | | 112 | | | 770 | | | 5,952 | | 2018 | | ― | | | 740 | | | 5,033 | | Beyond 2018 | | ― | | | 2,488 | | | 27,729 | | Total Estimated Amortization Expense | $ | 4,665 | | $ | 6,519 | | $ | 64,193 |
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