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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 - Level 3 - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Pooled trust preferred securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | $ 4,088 | $ 5,306
Realized adjustment to fair value |  | (18)
Unrealized adjustment to fair value | 366 | 923
Sales | (3,633) | (1,888)
Discount accretion | 2 | 4
Balance, end of period | 706 | 4,088
Pooled trust preferred securities | Call Option [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Settlements - calls | (117) | (239)
Single-issuer trust preferred securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 3,820 | 3,781
Realized adjustment to fair value |  | 0
Unrealized adjustment to fair value | (230) | 32
Sales | 0 | 0
Discount accretion | 10 | 7
Balance, end of period | 2,630 | 3,820
Single-issuer trust preferred securities | Call Option [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Settlements - calls | (970) | 0
Auction rate securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 100,941 | 159,274
Realized adjustment to fair value |  | 0
Unrealized adjustment to fair value | (903) | 3,970
Sales | 0 | (11,912)
Discount accretion | 467 | 821
Balance, end of period | 98,059 | 100,941
Auction rate securities | Call Option [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Settlements - calls | $ (2,446) | $ (51,212)

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- Definition Discount Accretion And Premium Amortization Changes For Assets Measured On Recurring Basis + References No definition available. + Details
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- Definition Fair Value Adjustment From Redemptions Of Investment Securities + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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