Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) Components and Related Tax Effects (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Balances at beginning of period	$ (19,998)	$ (41,665)
Balances at beginning of period, net of tax	(19,998)	(41,665)
Other comprehensive income (loss) before reclassifications	3,897	12,571
Reclassification adjustment for (gains) losses realized in income	(7)	(3)
Net current period other comprehensive income	3,890	12,568
Balances at end of period, net of tax	(16,108)	(29,097)
Unrealized Gains (Losses) on Securities Available for Sale [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balances at beginning of period	(4,315)	(40,393)
Balances at beginning of period, net of tax	(4,315)	(40,393)
Other comprehensive income (loss) before reclassifications	3,897	12,571
Reclassification adjustment for (gains) losses realized in income	(7)	(3)
Net current period other comprehensive income	3,890	12,568
Balances at end of period, net of tax	(425)	(27,825)
Disproportionate Tax Effect from Securities Available for Sale [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balances at beginning of period			(17,110)	(2,972)
Balances at beginning of period, net of tax	(17,110)	(2,972)
Balances at end of period, net of tax	(17,110)	(2,972)	(17,110)	(2,972)
Unrealized Gains (Losses) from Postretirement Plan [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balances at beginning of period			916	1,829
Balances at beginning of period, net of tax	916	1,829
Balances at end of period, net of tax	916	1,829	916	1,829
Disproportionate Tax Effect from Postretirement Plan [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balances at beginning of period			511	(129)
Balances at beginning of period, net of tax	511	(129)
Balances at end of period, net of tax	$ 511	$ (129)	$ 511	$ (129)

Accumulated other comprehensive income loss, after additional tax adjustment net of tax.

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- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

+ References

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References

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