Investment Securities - Amortized Cost and Estimated Fair Values of Investments in Debt and Equity Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 513,574	$ 402,740
Gross Unrealized Gains	15,443	4,189
Gross Unrealized Losses		(2,044)
Estimated Fair Value	529,017	404,885
Amortized Cost, Held to Maturity	674,412	726,530
Gross Unrealized Gains, Held to Maturity	25,187	8,671
Gross Unrealized Losses, Held to Maturity		(2,992)
Estimated Fair Value, Held to Maturity	699,599	732,209
Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	398,811	312,917
Gross Unrealized Gains	10,175	2,761
Gross Unrealized Losses		(1,996)
Estimated Fair Value	408,986	313,682
Amortized Cost, Held to Maturity	659,867	711,994
Gross Unrealized Gains, Held to Maturity	24,532	8,394
Gross Unrealized Losses, Held to Maturity		(2,882)
Estimated Fair Value, Held to Maturity	684,399	717,506
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	111,763	86,823
Gross Unrealized Gains	5,221	1,428
Gross Unrealized Losses		(33)
Estimated Fair Value	116,984	88,218
Amortized Cost, Held to Maturity	14,545	14,536
Gross Unrealized Gains, Held to Maturity	655	277
Gross Unrealized Losses, Held to Maturity		(110)
Estimated Fair Value, Held to Maturity	15,200	14,703
Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,000	3,000
Gross Unrealized Gains	47
Gross Unrealized Losses		(15)
Estimated Fair Value	$ 3,047	$ 2,985

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

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-Publisher FASB
-Name Accounting Standards Codification
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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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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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