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Fair Value Measurements Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Equity Securities, Other [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale Securities, Equity Securities $ 1,100   $ 1,100    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities, Other [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale Securities, Equity Securities 1,100   1,100   $ 5,800
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled Trust Preferred Securities [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Balance, beginning of period 530 $ 4,275 4,088 $ 5,306  
Unrealized adjustment to fair value [1] 0 230 190 789  
(Premium amortization) discount accretion [2] 0 0 2 4  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [3]   (18)   (18)  
Sales     (3,633) (1,394)  
Settlements - calls 0   (117) (200)  
Balance, end of period 530 4,487 530 4,487  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Single-issuer Trust Preferred Securities [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Balance, beginning of period 3,820 3,820 3,820 3,781  
Unrealized adjustment to fair value [1] (203) 47 (207) 83  
(Premium amortization) discount accretion [2] 3 2 7 5  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [3]   0   0  
Sales     0 0  
Settlements - calls (970)   (970) 0  
Balance, end of period 2,650 3,869 2,650 3,869  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Auction Rate Securities [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Balance, beginning of period 98,606 146,931 100,941 159,274  
Unrealized adjustment to fair value [1] (890) 1,280 (978) 1,528  
(Premium amortization) discount accretion [2] 157 262 356 664  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [3]   0   0  
Sales     0 (11,912)  
Settlements - calls 0   (2,446) (1,081)  
Balance, end of period $ 97,873 $ 148,473 $ 97,873 $ 148,473  
[1] Pooled trust preferred securities, single-issuer trust preferred securities and ARCs are classified as available for sale investment securities; as such, the unrealized adjustment to fair value was recorded as an unrealized holding gain (loss) and included as a component of available for sale investment securities on the consolidated balance sheets.
[2] Included as a component of net interest income on the consolidated statements of income.
[3] Realized adjustments to fair value represent credit related other-than-temporary impairment charges and gains on sales of investment securities, both included as components of investment securities gains on the consolidated statements of income.