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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) - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Pooled Trust Preferred Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 1,084 $ 5,659 $ 4,088 $ 5,306
Sales (554) (1,394) (3,633) (1,394)
Unrealized adjustment to fair value [1] 0 38 190 559
Settlements - calls   (28) (117) (200)
(Premium amortization) discount accretion [2] 0 0 2 4
Balance, end of period 530 4,275 530 4,275
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
Sales 0 0 0 0
Unrealized adjustment to fair value [1] (2) (2) (4) 36
Settlements - calls   0 0 0
(Premium amortization) discount accretion [2] 2 2 4 3
Balance, end of period 3,820 3,820 3,820 3,820
Auction Rate Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 98,932 147,713 100,941 159,274
Sales 0 0 0 (11,912)
Unrealized adjustment to fair value [1] (420) 124 (88) 248
Settlements - calls   (1,081) (2,446) (1,081)
(Premium amortization) discount accretion [2] 94 175 199 402
Balance, end of period $ 98,606 $ 146,931 $ 98,606 $ 146,931
[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.