Shareholders' Equity - Summary of Accumulated Other Comprehensive Income (Loss) Balances (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Balances at beginning of period	$ (41,665)	$ 6,682	$ 5,032
Income tax			(888)us-gaap_OtherComprehensiveIncomeLossTax
Balances at beginning of period, net of tax	(41,665)
Other comprehensive income (loss) before reclassifications	22,099	(45,581)	9,020
Reclassification adjustment for (gains) losses realized in income	(432)	(2,766)	(6,495)
Reclassification adjustment for OTTI charges	0	0	13
Net current period other comprehensive income	21,667	(48,347)	2,538
Balances at end of period, net of tax	(19,998)	(41,665)	6,682
Unrealized Gains (Losses) on Securities Available for Sale [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balances at beginning of period	(40,393)	8,053	5,538
Income tax	14,138
Balances at beginning of period, net of tax	(26,255)
Other comprehensive income (loss) before reclassifications	22,229	(45,869)	8,827
Reclassification adjustment for (gains) losses realized in income	(289)	(2,577)	(6,325)
Reclassification adjustment for OTTI charges			13
Net current period other comprehensive income	21,940	(48,446)	2,515
Balances at end of period, net of tax	(4,315)	(40,393)	8,053
Disproportionate Tax Effect from Securities Available for Sale [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balances at beginning of period	(2,972)		(2,092)
Income tax	(14,138)		(880)
Balances at beginning of period, net of tax	(17,110)
Balances at end of period, net of tax	(17,110)		(2,972)
Unrealized Gains (Losses) from Postretirement Plan [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balances at beginning of period	1,829	1,730	1,707
Income tax	(640)
Balances at beginning of period, net of tax	1,189
Other comprehensive income (loss) before reclassifications	(130)	288	193
Reclassification adjustment for (gains) losses realized in income	(143)	(189)	(170)
Net current period other comprehensive income	(273)	99	23
Balances at end of period, net of tax	916	1,829	1,730
Disproportionate Tax Effect from Postretirement Plan [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balances at beginning of period	(129)		(121)
Income tax	640		(8)
Balances at beginning of period, net of tax	511
Balances at end of period, net of tax	$ 511		$ (129)

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

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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

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

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

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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

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