Investments (Amortized Cost and Estimated Fair Values of Investments Available-for-sale) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Available For Sale Securities [Line Items]
Estimated Fair Value	$ 672,209,000us-gaap_AvailableForSaleSecurities	$ 751,284,000us-gaap_AvailableForSaleSecurities
Marketable Equity Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	723,000	723,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	723,000	723,000
Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	658,079,000	749,967,000
Gross Unrealized Gains	19,277,000	16,252,000
Gross Unrealized Losses	(5,870,000)	(15,658,000)
Estimated Fair Value	671,486,000	750,561,000
Debt Securities \| U.S. Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	144,497,000	147,688,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,818,000)	(8,222,000)
Estimated Fair Value	141,679,000	139,466,000
Debt Securities \| State and Municipal
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	157,603,000	159,524,000
Gross Unrealized Gains	9,453,000	6,060,000
Gross Unrealized Losses	(4,000)	(156,000)
Estimated Fair Value	167,052,000	165,428,000
Debt Securities \| Mortgage-Backed
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	354,631,000	439,054,000
Gross Unrealized Gains	9,824,000	10,188,000
Gross Unrealized Losses	(2,936,000)	(6,992,000)
Estimated Fair Value	361,519,000	442,250,000
Debt Securities \| Corporate Debt
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	0	2,000,000
Gross Unrealized Gains	0	4,000
Gross Unrealized Losses	0	0
Estimated Fair Value	0	2,004,000
Debt Securities \| Trust Preferred
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,348,000	1,701,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(112,000)	(288,000)
Estimated Fair Value	1,236,000	1,413,000
Available-for-Sale Securities \| Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	658,802,000	750,690,000
Gross Unrealized Gains	19,277,000	16,252,000
Gross Unrealized Losses	(5,870,000)	(15,658,000)
Estimated Fair Value	$ 672,209,000	$ 751,284,000

Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

No definition available.

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- Definition

Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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