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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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pooled Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 0	$ 875	$ 875	$ 707
Sales			(770)
Fair Value Adjustment From Transfers Of Debt Securities Available-For-Sale To Debt Securities Held-To-Maturity		0		0
Unrealized adjustment to fair value	0	0	(105)	168
Settlements - calls		0		0
(Premium amortization) discount accretion	0	0	0	0
Balance, end of period	0	875	0	875
Single-issuer Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	2,370	3,200	2,400	3,050
Sales			0
Fair Value Adjustment From Transfers Of Debt Securities Available-For-Sale To Debt Securities Held-To-Maturity		71		71
Unrealized adjustment to fair value	(2)	153	(32)	297
Settlements - calls		(950)		(950)
(Premium amortization) discount accretion	2	1	2	7
Balance, end of period	2,370	2,475	2,370	2,475
Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	103,365	103,122	102,994	98,668
Sales			0
Fair Value Adjustment From Transfers Of Debt Securities Available-For-Sale To Debt Securities Held-To-Maturity		0		0
Unrealized adjustment to fair value	(67)	11	304	4,465
Settlements - calls		0		0
(Premium amortization) discount accretion	0	0	0	0
Balance, end of period	$ 103,298	$ 103,133	$ 103,298	$ 103,133

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- Definition

Discount Accretion And Premium Amortization Changes For Assets Measured On Recurring Basis

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- Definition

Fair Value Adjustment From Transfers Of Debt Securities Available-For-Sale To Debt Securities Held-To-Maturity

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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Amount of sale of 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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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Fair value of 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.

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