Goodwill and Other Intangible Assets - Rollforward of Goodwill (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
Goodwill [Line Items] | ||
Goodwill, Beginning Balance | $ 832,213 | $ 764,248 |
Goodwill (deductions) additions | 873 | 67,965 |
Goodwill, Ending Balance | 833,086 | 832,213 |
Community Banking [Member] | ||
Goodwill [Line Items] | ||
Goodwill, Beginning Balance | 813,434 | 745,469 |
Goodwill (deductions) additions | (1,035) | 67,965 |
Goodwill, Ending Balance | 812,399 | 813,434 |
Wealth Management [Member] | ||
Goodwill [Line Items] | ||
Goodwill, Beginning Balance | 8,020 | 8,020 |
Goodwill, Ending Balance | 8,020 | 8,020 |
Insurance [Member] | ||
Goodwill [Line Items] | ||
Goodwill, Beginning Balance | 8,950 | 8,950 |
Goodwill (deductions) additions | 1,908 | |
Goodwill, Ending Balance | 10,858 | 8,950 |
Consumer Finance [Member] | ||
Goodwill [Line Items] | ||
Goodwill, Beginning Balance | 1,809 | 1,809 |
Goodwill, Ending Balance | $ 1,809 | $ 1,809 |