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Segment Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) Segment | Jun. 30, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of segments in which the business operates | Segment |  |  | 3 |
Net interest income | $ 96,949 | $ 105,288 | $ 194,341 | $ 200,192
Provision for loan losses, net | 1,858 | 4,135 | 3,990 | 3,393
Noninterest income | 45,543 | 44,140 | 87,906 | 88,218
Noninterest expense | 100,266 | 102,761 | 199,482 | 204,379
Income before income taxes | 40,368 | 42,532 | 78,775 | 80,638
Income taxes | 9,766 | 9,635 | 19,025 | 18,738
Net Income | 30,602 | 32,897 | 59,750 | 61,900
Selected Financial Information [Abstract] |  |  |  |
Average assets | 12,113,259 | 11,971,023 | 12,119,248 | 11,945,064
Depreciation and amortization | 9,449 | 9,200 | 18,529 | 17,956
General Banking [Member] | Reportable Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | 96,815 | 105,064 | 194,075 | 199,750
Provision for loan losses, net | 1,858 | 4,135 | 3,990 | 3,393
Noninterest income | 28,417 | 28,139 | 54,157 | 56,022
Noninterest expense | 86,843 | 89,545 | 172,360 | 178,132
Income before income taxes | 36,531 | 39,523 | 71,882 | 74,247
Income taxes | 8,297 | 8,563 | 16,381 | 16,477
Net Income | 28,234 | 30,960 | 55,501 | 57,770
Selected Financial Information [Abstract] |  |  |  |
Average assets | 12,036,687 | 11,898,424 | 12,054,143 | 11,876,198
Depreciation and amortization | 9,172 | 8,918 | 18,047 | 17,393
Wealth Management [Member] | Reportable Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | 48 | 134 | 103 | 282
Noninterest income | 7,722 | 7,698 | 15,729 | 15,795
Noninterest expense | 6,408 | 6,620 | 13,178 | 13,054
Income before income taxes | 1,362 | 1,212 | 2,654 | 3,023
Income taxes | 502 | 402 | 1,015 | 1,002
Net Income | 860 | 810 | 1,639 | 2,021
Selected Financial Information [Abstract] |  |  |  |
Average assets | 4,256 | 2,084 | 3,052 | 2,159
Depreciation and amortization | 49 | 49 | 95 | 95
Insurance [Member] | Reportable Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | 86 | 90 | 163 | 160
Noninterest income | 9,404 | 8,303 | 18,020 | 16,401
Noninterest expense | 7,015 | 6,596 | 13,944 | 13,193
Income before income taxes | 2,475 | 1,797 | 4,239 | 3,368
Income taxes | 967 | 670 | 1,629 | 1,259
Net Income | 1,508 | 1,127 | 2,610 | 2,109
Selected Financial Information [Abstract] |  |  |  |
Average assets | 72,316 | 70,515 | 62,053 | 66,707
Depreciation and amortization | $ 228 | $ 233 | $ 387 | $ 468

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