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Investment in Qualified Affordable Housing (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Noninterest Expense | $ 47,429 | $ 44,972 | $ 137,816 | $ 136,992 |  |
Income Tax Expense (Benefit) | 8,033 | 8,363 | 24,433 | 25,801 |  |
Affordable Housing Program Assessments | 1,700 | 1,700 | 5,200 |  |  |
Net Income | 20,040 | 18,269 | 60,123 | 59,656 |  |
Other Assets | 11,114 |  | 11,114 |  | $ 14,645 |
Assets | 7,300,340 | 7,011,255 | 7,300,340 | 7,011,255 | 7,001,199 |
Retained earnings | 501,145 |  | 501,145 |  | 484,484 |
Affordable Housing Program Obligation | 21,339 |  | 21,339 |  | 16,629 |
Affordable Housing Tax Credits and Other Tax Benefits, Amount | 2,300 | 2,200 | 6,800 | 6,600 |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 715,803 |  | 715,803 |  | 696,541 |
Other Assets [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Other Assets |  |  |  |  | 140,803 |
Other Assets [Member] | Restatement Adjustment [Member] | Investment, Name [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Other Assets |  |  |  |  | 138,746 |
Retained Earnings [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net Income |  |  | 60,123 | 59,656 |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 501,145 | 474,913 | 501,145 | 474,913 | 486,541 | $ 460,643
Retained Earnings [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings |  |  |  |  | 486,541 |
Retained Earnings [Member] | Restatement Adjustment [Member] | Investment, Name [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings |  |  |  |  | 484,484 |
Assets [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Assets |  |  |  |  | 7,003,256 |
Assets [Member] | Restatement Adjustment [Member] | Investment, Name [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Assets |  |  |  |  | 7,001,199 |
Equity [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | 698,598 |
Equity [Member] | Restatement Adjustment [Member] | Investment, Name [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | 696,541 |
Qualified Affordable Housing [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Equity Method Investments | $ 52,731 |  | $ 52,731 |  | 48,911 |
Qualified Affordable Housing [Domain] | Scenario, Previously Reported [Member] | Investment, Name [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Equity Method Investments |  |  |  |  | 45,400 |
Other Income [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Noninterest Expense |  | 46,903 |  | 142,797 | 195,234 |
Other Income [Member] | Restatement Adjustment [Member] | Investment, Name [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Noninterest Expense |  | 44,972 |  | 136,992 | 187,510 |
Income Tax Expense [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Income Tax Expense (Benefit) |  | 6,398 |  | 19,903 | 28,602 |
Income Tax Expense [Member] | Restatement Adjustment [Member] | Investment, Name [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Income Tax Expense (Benefit) |  | 8,363 |  | 25,801 | 36,459 |
Net Income [Domain] | Scenario, Previously Reported [Member] | Investment, Name [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net Income |  | 18,303 |  | 59,749 | 84,090 |
Net Income [Domain] | Restatement Adjustment [Member] | Investment, Name [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net Income |  | $ 18,269 |  | $ 59,656 | $ 83,957 |

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- Definition Amount of obligation related to Affordable Housing Program (AHP) assessments required by the Federal Home Loan Bank Act of 1932. + References No definition available. + Details
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- Definition Amount of affordable housing tax credits and other tax benefits recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49127445&loc=SL49122993-202985 + Details
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- Definition Amount of amortization expense of investment in qualified affordable housing projects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=49127445&loc=SL49122993-202985 + Details
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