Investment Securities - Amortized Cost and Estimated Fair Values of Investments in Debt and Equity Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 221,071	$ 79,165
Gross Unrealized Gains	4,297	4,065
Gross Unrealized Losses	(242)	(25)
Estimated Fair Value	225,126us-gaap_AvailableForSaleSecurities	83,205us-gaap_AvailableForSaleSecurities
Amortized Cost, Held to Maturity	802,482	676,426
Gross Unrealized Gains, Held to Maturity	15,821	13,185
Gross Unrealized Losses, Held to Maturity	(510)	(832)
Estimated Fair Value, Held to Maturity	817,793	688,779
Obligations of U.S. government corporations and agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	206,476	71,144
Gross Unrealized Gains	4,221	4,001
Gross Unrealized Losses	(162)	(25)
Estimated Fair Value	210,535	75,120
Amortized Cost, Held to Maturity	786,889	660,836
Gross Unrealized Gains, Held to Maturity	15,726	13,055
Gross Unrealized Losses, Held to Maturity	(339)	(677)
Estimated Fair Value, Held to Maturity	802,276	673,214
Obligations of states and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,700	3,130
Gross Unrealized Gains	36	45
Gross Unrealized Losses	(80)
Estimated Fair Value	9,656	3,175
Amortized Cost, Held to Maturity	15,593	15,590
Gross Unrealized Gains, Held to Maturity	95	130
Gross Unrealized Losses, Held to Maturity	(171)	(155)
Estimated Fair Value, Held to Maturity	15,517	15,565
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,895	1,891
Gross Unrealized Gains	10	17
Estimated Fair Value	1,905	1,908
Marketable equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,000	3,000
Gross Unrealized Gains	30	2
Estimated Fair Value	$ 3,030	$ 3,002

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

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

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

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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.

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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

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Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of investments in debt securities classified as held-to-maturity.

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