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Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | $ 3,062,143 | $ 2,497,537
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgages Held-for-sale, Fair Value Disclosure | 83,886 | 37,828
Estimated Fair Value | 3,062,143 |
Available-for-sale Securities, Fair Value Disclosure |  | 2,497,537
Investments held in Rabbi Trust | 24,383 | 22,213
Derivative assets | 339,310 | 145,595
Assets, Fair Value Disclosure | 3,509,722 | 2,703,173
Liabilities Held-In-Trust, Fair Value Disclosure | 24,383 | 22,213
Derivative Liability | 167,785 | 76,646
Total liabilities | 192,168 | 98,859
State and municipal securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 952,613 |
Available-for-sale Securities, Fair Value Disclosure |  | 652,927
State and municipal securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 952,613 |
Available-for-sale Securities, Fair Value Disclosure |  | 652,927
Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 367,145 |
Available-for-sale Securities, Fair Value Disclosure |  | 377,357
Corporate debt securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 367,145 |
Available-for-sale Securities, Fair Value Disclosure |  | 377,357
Collateralized mortgage obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 503,766 |
Available-for-sale Securities, Fair Value Disclosure |  | 693,718
Collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 503,766 |
Available-for-sale Securities, Fair Value Disclosure |  | 693,718
Residential mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 377,998 |
Available-for-sale Securities, Fair Value Disclosure |  | 177,312
Residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 377,998 |
Available-for-sale Securities, Fair Value Disclosure |  | 177,312
Commercial mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 762,415 |
Available-for-sale Securities, Fair Value Disclosure |  | 494,297
Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 762,415 |
Available-for-sale Securities, Fair Value Disclosure |  | 494,297
Auction rate securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 98,206 |
Available-for-sale Securities, Fair Value Disclosure |  | 101,926
Auction rate securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 98,206 |
Available-for-sale Securities, Fair Value Disclosure |  | 101,926
Single-issuer trust preferred securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 | 11,200
Level 1 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgages Held-for-sale, Fair Value Disclosure | 0 | 0
Estimated Fair Value | 0 |
Available-for-sale Securities, Fair Value Disclosure |  | 0
Investments held in Rabbi Trust | 24,383 | 22,213
Derivative assets | 323 | 230
Assets, Fair Value Disclosure | 24,706 | 22,443
Liabilities Held-In-Trust, Fair Value Disclosure | 24,383 | 22,213
Derivative Liability | 280 | 199
Total liabilities | 24,663 | 22,412
Level 1 | State and municipal securities | Fair Value, Measurements, Recurring |  |
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
Level 1 | Corporate debt securities | Fair Value, Measurements, Recurring |  |
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
Level 1 | Collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
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
Level 1 | Residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
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
Level 1 | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
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
Level 1 | Auction rate securities | Fair Value, Measurements, Recurring |  |
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
Level 2 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgages Held-for-sale, Fair Value Disclosure | 83,886 | 37,828
Estimated Fair Value | 2,963,937 |
Available-for-sale Securities, Fair Value Disclosure |  | 2,393,211
Investments held in Rabbi Trust | 0 | 0
Derivative assets | 338,987 | 145,365
Assets, Fair Value Disclosure | 3,386,810 | 2,576,404
Liabilities Held-In-Trust, Fair Value Disclosure | 0 | 0
Derivative Liability | 167,505 | 76,447
Total liabilities | 167,505 | 76,447
Level 2 | Other Corporate Debt | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 4,400 | 3,900
Level 2 | Financial Institutions Subordinated Debt | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 362,800 | 362,300
Level 2 | State and municipal securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 952,613 |
Available-for-sale Securities, Fair Value Disclosure |  | 652,927
Level 2 | Corporate debt securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 367,145 |
Available-for-sale Securities, Fair Value Disclosure |  | 374,957
Level 2 | Collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 503,766 |
Available-for-sale Securities, Fair Value Disclosure |  | 693,718
Level 2 | Residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 377,998 |
Available-for-sale Securities, Fair Value Disclosure |  | 177,312
Level 2 | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 762,415 |
Available-for-sale Securities, Fair Value Disclosure |  | 494,297
Level 2 | Auction rate securities | Fair Value, Measurements, Recurring |  |
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
Level 2 | Single-issuer trust preferred securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 | 8,800
Level 3 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgages Held-for-sale, Fair Value Disclosure | 0 | 0
Estimated Fair Value | 98,206 |
Available-for-sale Securities, Fair Value Disclosure |  | 104,326
Investments held in Rabbi Trust | 0 | 0
Derivative assets | 0 | 0
Assets, Fair Value Disclosure | 98,206 | 104,326
Liabilities Held-In-Trust, Fair Value Disclosure | 0 | 0
Derivative Liability | 0 | 0
Total liabilities | 0 | 0
Level 3 | State and municipal securities | Fair Value, Measurements, Recurring |  |
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
Level 3 | Corporate debt securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 |
Available-for-sale Securities, Fair Value Disclosure |  | 2,400
Level 3 | Collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
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
Level 3 | Residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
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
Level 3 | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
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
Level 3 | Auction rate securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 98,206 |
Available-for-sale Securities, Fair Value Disclosure |  | 101,926
Level 3 | Single-issuer trust preferred securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | $ 0 | $ 2,400

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