Fair Value Measurements Narrative (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Equity securities, value test coverage	80.00%
Fair value price difference threshold	5.00%
Estimated Fair Value	$ 2,275,748,000
Other real estate owned (OREO)	12,022,000	15,052,000
Assumed market return to liquidity	5 years
Equity Securities Financial Institution
Available-for-sale securities, equity securities	41,800,000	40,600,000
Equity Securities, Miscellaneous
Available-for-sale securities, equity securities	5,800,000	5,600,000
Corporate debt securities
Estimated Fair Value	98,034,000	98,749,000
Single-issuer trust preferred securities
Estimated Fair Value	42,016,000	40,531,000
Pooled trust preferred securities
Estimated Fair Value	4,088,000	5,306,000
Level 3 \| Other Assets
Other real estate owned (OREO)	12,000,000	15,100,000
Fair value of servicing asset at amortized value	42,100,000	42,500,000
Fair Value, Measurements, Recurring
Other financial assets	38,987,000	23,006,000
Other financial liabilities	38,821,000	20,809,000
Fair Value, Measurements, Recurring \| Single-issuer trust preferred securities
Estimated Fair Value	42,000,000	40,500,000
Fair Value, Measurements, Recurring \| Level 1
Other financial assets	17,682,000	15,779,000
Other financial liabilities	17,737,000	15,648,000
Fair Value, Measurements, Recurring \| Level 1 \| Equity Securities Financial Institution
Available-for-sale securities, equity securities	41,800,000	40,600,000
Fair Value, Measurements, Recurring \| Level 1 \| Equity Securities, Miscellaneous
Available-for-sale securities, equity securities	5,800,000	5,600,000
Fair Value, Measurements, Recurring \| Level 2
Other financial assets	21,305,000	7,227,000
Other financial liabilities	21,084,000	5,161,000
Fair Value, Measurements, Recurring \| Level 2 \| Financial Institutions Subordinated Debt
Estimated Fair Value	50,000,000	50,300,000
Fair Value, Measurements, Recurring \| Level 2 \| Single-issuer trust preferred securities
Estimated Fair Value	38,200,000	36,700,000
Fair Value, Measurements, Recurring \| Level 2 \| Other Corporate Debt
Estimated Fair Value	1,900,000	2,600,000
Fair Value, Measurements, Recurring \| Level 3
Other financial assets	0	0
Other financial liabilities	0	0
Fair Value, Measurements, Recurring \| Level 3 \| Single-issuer trust preferred securities
Estimated Fair Value	3,800,000	3,800,000
Fair Value, Measurements, Recurring \| Level 3 \| Pooled trust preferred securities
Estimated Fair Value	4,100,000	5,300,000
Minimum
Assumptions used to estimate fair value, prepayment speed	12.60%
Assumptions used to estimate fair value, discount rate	9.10%
Trust for Benefit of Employees \| Fair Value, Measurements, Recurring \| Level 1
Other financial assets	16,400,000	15,300,000
Foreign Exchange Contract \| Fair Value, Measurements, Recurring \| Level 1
Other financial assets	1,300,000	522,000
Forward Commitments \| Fair Value, Measurements, Recurring \| Level 2
Other financial assets	1,400,000	2,100,000
Other financial liabilities	1,200,000	64,000
Interest Rate Swap \| Fair Value, Measurements, Recurring \| Level 2
Other financial assets	19,900,000	5,100,000
Other financial liabilities	19,900,000	5,100,000
Foreign Exchange Contract \| Fair Value, Measurements, Recurring \| Level 1
Other financial liabilities	1,300,000	391,000
Trust for Benefit of Employees \| Fair Value, Measurements, Recurring \| Level 1
Other financial liabilities	$ 16,400,000	$ 15,300,000
Short Term Financial Instruments
Short term borrowings, reprice period	90

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

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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Fair value of financial and nonfinancial obligations.

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Fair value portion of other assets.

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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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