Fair Value Measurements Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities, value test coverage	95.00%
Fair value price difference threshold	5.00%
Estimated Fair Value	$ 2,080,294	$ 2,547,956
Other real estate owned (OREO)	$ 10,518	9,823
Assumed market return to liquidity	5 years
Level 3 \| Other Assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned (OREO)	$ 10,500	9,800
Net MSRs at end of year	$ 38,600	37,700
Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assumptions used to estimate fair value, prepayment speed	8.90%
Assumptions used to estimate fair value, discount rate	9.00%
Fair Value, Measurements, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value	$ 2,080,294	2,547,956
Derivative assets	62,944	45,008
Total liabilities	66,981
Fair Value, Measurements, Recurring \| Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value	0	918
Derivative assets	392	469
Total liabilities	18,796
Fair Value, Measurements, Recurring \| Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value	1,974,025	2,444,613
Derivative assets	62,552	44,539
Total liabilities	48,185
Fair Value, Measurements, Recurring \| Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value	106,269	102,425
Derivative assets	0	0
Total liabilities	0
Fair Value, Measurements, Recurring \| Foreign Exchange Contract \| Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total liabilities	381	400
Fair Value, Measurements, Recurring \| Trust for Benefit of Employees \| Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total liabilities	18,400	19,000
Fair Value, Measurements, Recurring \| Trust for Benefit of Employees \| Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	18,400	19,000
Fair Value, Measurements, Recurring \| Foreign Exchange Contract \| Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	392	500
Fair Value, Measurements, Recurring \| Forward Commitments \| Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1,200	1,100
Total liabilities	1,078	300
Fair Value, Measurements, Recurring \| Interest Rate Swap \| Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	61,400	43,400
Total liabilities	47,100	38,700
Equity securities \| Fair Value, Measurements, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value		918
Equity securities \| Fair Value, Measurements, Recurring \| Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value		918
Equity securities \| Fair Value, Measurements, Recurring \| Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value		0
Equity securities \| Fair Value, Measurements, Recurring \| Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value		0
Corporate debt securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value	109,533
Corporate debt securities \| Fair Value, Measurements, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value	109,533	97,309
Corporate debt securities \| Fair Value, Measurements, Recurring \| Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value	0	0
Corporate debt securities \| Fair Value, Measurements, Recurring \| Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value	106,258	93,552
Corporate debt securities \| Fair Value, Measurements, Recurring \| Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value	3,275	3,757
Financial Institutions Subordinated Debt \| Fair Value, Measurements, Recurring \| Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value	86,100	61,900
Single-issuer trust preferred securities \| Fair Value, Measurements, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value	18,600	30,700
Single-issuer trust preferred securities \| Fair Value, Measurements, Recurring \| Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value	16,300	27,700
Single-issuer trust preferred securities \| Fair Value, Measurements, Recurring \| Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value	2,400	3,100
Pooled trust preferred securities \| Fair Value, Measurements, Recurring \| Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value	875	700
Other Corporate Debt \| Fair Value, Measurements, Recurring \| Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value	$ 3,900	$ 4,000

Differences by security in excess of of threhold are researched to reconcile the difference.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value of financial and nonfinancial obligations.

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Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

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Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Estimated rate of prepayments of principal on servicing assets and servicing liabilities.

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