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Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | $ 2,758,597 | $ 3,062,143
Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 2,758,597 |
Mortgages Held-for-sale, Fair Value Disclosure | 34,092 | 83,886
Available-for-sale Securities, Fair Value Disclosure |  | 3,062,143
Investments held in Rabbi Trust | 25,374 | 24,383
Derivative assets | 197,131 | 339,310
Assets, Fair Value Disclosure | 3,015,194 | 3,509,722
Liabilities Held-In-Trust, Fair Value Disclosure | 25,374 | 24,383
Derivative Liability | 109,169 | 167,785
Total liabilities | 134,543 | 192,168
US States and Political Subdivisions Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 994,760 |
Available-for-sale Securities, Fair Value Disclosure |  | 952,613
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 994,760 |
Available-for-sale Securities, Fair Value Disclosure |  | 952,613
Corporate Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 359,371 |
Available-for-sale Securities, Fair Value Disclosure |  | 367,145
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 359,371 |
Available-for-sale Securities, Fair Value Disclosure |  | 367,145
Collateralized Mortgage Obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 399,881 |
Available-for-sale Securities, Fair Value Disclosure |  | 503,766
Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 399,881 |
Available-for-sale Securities, Fair Value Disclosure |  | 503,766
Mortgage-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 255,364 |
Available-for-sale Securities, Fair Value Disclosure |  | 377,998
Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 255,364 |
Available-for-sale Securities, Fair Value Disclosure |  | 377,998
Commercial Mortgage Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 673,017 |
Available-for-sale Securities, Fair Value Disclosure |  | 762,415
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 673,017 |
Available-for-sale Securities, Fair Value Disclosure |  | 762,415
Auction Rate Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 76,204 |
Available-for-sale Securities, Fair Value Disclosure |  | 98,206
Auction Rate Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 76,204 |
Available-for-sale Securities, Fair Value Disclosure |  | 98,206
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 |
Mortgages Held-for-sale, Fair Value Disclosure | 0 | 0
Available-for-sale Securities, Fair Value Disclosure |  | 0
Investments held in Rabbi Trust | 25,374 | 24,383
Derivative assets | 323 | 323
Assets, Fair Value Disclosure | 25,697 | 24,706
Liabilities Held-In-Trust, Fair Value Disclosure | 25,374 | 24,383
Derivative Liability | 272 | 280
Total liabilities | 25,646 | 24,663
Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 |
Available-for-sale Securities, Fair Value Disclosure |  | 0
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 |
Available-for-sale Securities, Fair Value Disclosure |  | 0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 |
Available-for-sale Securities, Fair Value Disclosure |  | 0
Fair Value, Inputs, Level 1 [Member] | Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 |
Available-for-sale Securities, Fair Value Disclosure |  | 0
Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 |
Available-for-sale Securities, Fair Value Disclosure |  | 0
Fair Value, Inputs, Level 1 [Member] | Auction Rate Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 |
Available-for-sale Securities, Fair Value Disclosure |  | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 2,682,393 |
Mortgages Held-for-sale, Fair Value Disclosure | 34,092 | 83,886
Available-for-sale Securities, Fair Value Disclosure |  | 2,963,937
Investments held in Rabbi Trust | 0 | 0
Derivative assets | 196,808 | 338,987
Assets, Fair Value Disclosure | 2,913,293 | 3,386,810
Liabilities Held-In-Trust, Fair Value Disclosure | 0 | 0
Derivative Liability | 108,897 | 167,505
Total liabilities | 108,897 | 167,505
Fair Value, Inputs, Level 2 [Member] | Other Corporate Debt [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 4,400 |
Fair Value, Inputs, Level 2 [Member] | Financial Institutions Subordinated Debt [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 355,000 | 362,800
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 994,760 |
Available-for-sale Securities, Fair Value Disclosure |  | 952,613
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 359,371 |
Available-for-sale Securities, Fair Value Disclosure |  | 367,145
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 399,881 |
Available-for-sale Securities, Fair Value Disclosure |  | 503,766
Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 255,364 |
Available-for-sale Securities, Fair Value Disclosure |  | 377,998
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 673,017 |
Available-for-sale Securities, Fair Value Disclosure |  | 762,415
Fair Value, Inputs, Level 2 [Member] | Auction Rate Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 |
Available-for-sale Securities, Fair Value Disclosure |  | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 76,204 |
Mortgages Held-for-sale, Fair Value Disclosure | 0 | 0
Available-for-sale Securities, Fair Value Disclosure |  | 98,206
Investments held in Rabbi Trust | 0 | 0
Derivative assets | 0 | 0
Assets, Fair Value Disclosure | 76,204 | 98,206
Liabilities Held-In-Trust, Fair Value Disclosure | 0 | 0
Derivative Liability | 0 | 0
Total liabilities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 |
Available-for-sale Securities, Fair Value Disclosure |  | 0
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 |
Available-for-sale Securities, Fair Value Disclosure |  | 0
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 |
Available-for-sale Securities, Fair Value Disclosure |  | 0
Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 |
Available-for-sale Securities, Fair Value Disclosure |  | 0
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 |
Available-for-sale Securities, Fair Value Disclosure |  | 0
Fair Value, Inputs, Level 3 [Member] | Auction Rate Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | $ 76,204 |
Available-for-sale Securities, Fair Value Disclosure |  | $ 98,206

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