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Fair Value Measurements and Fair Value of Financial Instruments, Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financial assets [Abstract]
Securities held to maturity	$ 495,596	$ 473,140
Financial liabilities [Abstract]
Time deposits	881,087	908,827
Long-term debt	114,144	130,447
Junior subordinated debt	101,196	101,196
Carrying Amount [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets [Abstract]
Securities held to maturity	485,877	471,031
Financial liabilities [Abstract]
Time deposits	881,087	908,827
Long-term debt	114,144	130,447
Junior subordinated debt	101,196	101,196
Carrying Amount [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets [Abstract]
Net loans	6,094,517	5,820,115
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets [Abstract]
Securities held to maturity	495,596	473,140
Financial liabilities [Abstract]
Time deposits	883,221	903,501
Long-term debt	115,840	131,268
Junior subordinated debt	101,141	97,346
Estimated Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets [Abstract]
Net loans	6,251,740	5,958,427
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, notional amount	344,400	192,600
Fair value of derivative asset	18,300	6,200
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional amount	344,400	192,600
Fair value of derivative liability	18,300	$ 6,200
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional amount	150,000
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	$ 700

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Fair value of investments in debt securities classified as held-to-maturity.

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