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Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | $ 2,159,806 | $ 2,080,294
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 2,159,806 |
Mortgages Held-for-sale, Fair Value Disclosure | 27,768 | 27,099
Available-for-sale Securities, Fair Value Disclosure |  | 2,080,294
Investments held in Rabbi Trust | 19,979 | 18,415
Derivative assets | 82,126 | 62,944
Assets, Fair Value Disclosure | 2,289,679 | 2,188,752
Liabilities Held-In-Trust, Fair Value Disclosure | 19,979 | 18,415
Derivative Liability | 50,441 | 48,566
Total liabilities | 70,420 | 66,981
U.S. Government-Sponsored Agency Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 27,524 |
Available-for-sale Securities, Fair Value Disclosure |  | 31,632
U.S. Government-Sponsored Agency Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 27,524 |
Available-for-sale Securities, Fair Value Disclosure |  | 31,632
US States and Political Subdivisions Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 297,684 |
Available-for-sale Securities, Fair Value Disclosure |  | 279,095
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 297,684 |
Available-for-sale Securities, Fair Value Disclosure |  | 279,095
Corporate Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 121,288 |
Available-for-sale Securities, Fair Value Disclosure |  | 109,533
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 121,288 |
Available-for-sale Securities, Fair Value Disclosure |  | 109,533
Collateralized Mortgage Obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 887,405 |
Available-for-sale Securities, Fair Value Disclosure |  | 832,080
Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 887,405 |
Available-for-sale Securities, Fair Value Disclosure |  | 832,080
Mortgage-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 440,858 |
Available-for-sale Securities, Fair Value Disclosure |  | 463,344
Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 440,858 |
Available-for-sale Securities, Fair Value Disclosure |  | 463,344
Commercial Mortgage Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 282,237 |
Available-for-sale Securities, Fair Value Disclosure |  | 261,616
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 282,237 |
Available-for-sale Securities, Fair Value Disclosure |  | 261,616
Auction Rate Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 102,810 |
Available-for-sale Securities, Fair Value Disclosure |  | 102,994
Auction Rate Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 102,810 |
Available-for-sale Securities, Fair Value Disclosure |  | 102,994
Single-issuer Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 19,300 | 18,600
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, 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 | 19,979 | 18,415
Derivative assets | 428 | 392
Assets, Fair Value Disclosure | 20,407 | 18,807
Liabilities Held-In-Trust, Fair Value Disclosure | 19,979 | 18,415
Derivative Liability | 356 | 381
Total liabilities | 20,335 | 18,796
Fair Value, Inputs, Level 1 [Member] | U.S. Government-Sponsored Agency Securities [Member] | Fair Value, Measurements, 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] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, 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, Measurements, 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, Measurements, 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, Measurements, 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, Measurements, 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, Measurements, 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, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 2,053,796 |
Mortgages Held-for-sale, Fair Value Disclosure | 27,768 | 27,099
Available-for-sale Securities, Fair Value Disclosure |  | 1,974,025
Investments held in Rabbi Trust | 0 | 0
Derivative assets | 81,698 | 62,552
Assets, Fair Value Disclosure | 2,163,262 | 2,063,676
Liabilities Held-In-Trust, Fair Value Disclosure | 0 | 0
Derivative Liability | 50,085 | 48,185
Total liabilities | 50,085 | 48,185
Fair Value, Inputs, Level 2 [Member] | Other Corporate Debt [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 3,900 |
Fair Value, Inputs, Level 2 [Member] | Financial Institutions Subordinated Debt [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 97,200 | 86,100
Fair Value, Inputs, Level 2 [Member] | U.S. Government-Sponsored Agency Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 27,524 |
Available-for-sale Securities, Fair Value Disclosure |  | 31,632
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 297,684 |
Available-for-sale Securities, Fair Value Disclosure |  | 279,095
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 118,088 |
Available-for-sale Securities, Fair Value Disclosure |  | 106,258
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 887,405 |
Available-for-sale Securities, Fair Value Disclosure |  | 832,080
Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 440,858 |
Available-for-sale Securities, Fair Value Disclosure |  | 463,344
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 282,237 |
Available-for-sale Securities, Fair Value Disclosure |  | 261,616
Fair Value, Inputs, Level 2 [Member] | Auction Rate Securities [Member] | Fair Value, Measurements, 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] | Single-issuer Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 17,000 | 16,300
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 106,010 |
Mortgages Held-for-sale, Fair Value Disclosure | 0 | 0
Available-for-sale Securities, Fair Value Disclosure |  | 106,269
Investments held in Rabbi Trust | 0 | 0
Derivative assets | 0 | 0
Assets, Fair Value Disclosure | 106,010 | 106,269
Liabilities Held-In-Trust, Fair Value Disclosure | 0 | 0
Derivative Liability | 0 | 0
Total liabilities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Pooled Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 770 | 875
Fair Value, Inputs, Level 3 [Member] | U.S. Government-Sponsored Agency Securities [Member] | Fair Value, Measurements, 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] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, 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, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 3,200 |
Available-for-sale Securities, Fair Value Disclosure |  | 3,275
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, 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, Measurements, 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, Measurements, 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, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 102,810 |
Available-for-sale Securities, Fair Value Disclosure |  | $ 102,994
Fair Value, Inputs, Level 3 [Member] | Single-issuer Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | $ 2,400 |

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