Equity Securities (Schedule of Amortized Cost, Gross Unrealized gains, Losses, and Fair Value of Equity Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Net Investment Income [Line Items]
Amortized Cost	$ 315,833	$ 324,503
Gross Unrealized Gains	129	357
Gross Unrealized Losses	(8,709)	(5,199)
Fair Value	307,253	$ 319,661
CRA-qualified mutual funds [Member]
Net Investment Income [Line Items]
Amortized Cost	5,341
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	5,341
Bank stocks [Member]
Net Investment Income [Line Items]
Amortized Cost	368
Gross Unrealized Gains	30
Gross Unrealized Losses	(2)
Fair Value	396
Equity Securities [Member]
Net Investment Income [Line Items]
Amortized Cost	5,709
Gross Unrealized Gains	30
Gross Unrealized Losses	(2)
Fair Value	$ 5,737

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

No definition available.

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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