Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale and Held to Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Available-for-Sale
Available-for-sale, Amortized Cost	$ 657,631	$ 640,455
Unrealized Gains	9,636	1,516
Unrealized Losses	3,342	4,642
Available-for-sale securities	663,925	637,329
Held-to-Maturity
Held-to-maturity, Amortized Cost	460,483	472,505
Unrealized Gains	9,906	3,842
Unrealized Losses	3,017	1,213
Fair value of investment securities held-to-maturity	467,372	475,134
Corporate bonds
Available-for-Sale
Available-for-sale, Amortized Cost	42,959	22,870
Unrealized Gains	23	112
Unrealized Losses	3,170	227
Available-for-sale securities	39,812	22,755
Mortgage-backed securities—residential issued by government sponsored entities
Available-for-Sale
Available-for-sale, Amortized Cost	611,433	614,176
Unrealized Gains	9,603	1,376
Unrealized Losses	172	4,415
Available-for-sale securities	620,864	611,137
Industrial revenue bonds
Available-for-Sale
Available-for-sale, Amortized Cost	3,239	3,409
Unrealized Gains	10	28
Unrealized Losses	0	0
Available-for-sale securities	3,249	3,437
U.S. Government agencies
Held-to-Maturity
Held-to-maturity, Amortized Cost	12,491	12,805
Unrealized Gains	456	230
Unrealized Losses	0	0
Fair value of investment securities held-to-maturity	12,947	13,035
Corporate bonds
Held-to-Maturity
Held-to-maturity, Amortized Cost	74,016	70,059
Unrealized Gains	232	0
Unrealized Losses	3,000	401
Fair value of investment securities held-to-maturity	71,248	69,658
State and political subdivisions—tax exempt
Held-to-Maturity
Held-to-maturity, Amortized Cost	10,533	10,849
Unrealized Gains	601	488
Unrealized Losses	0	0
Fair value of investment securities held-to-maturity	11,134	11,337
State and political subdivisions—taxable
Held-to-Maturity
Held-to-maturity, Amortized Cost	526	528
Unrealized Gains	24	17
Unrealized Losses	0	0
Fair value of investment securities held-to-maturity	550	545
Mortgage-backed securities—residential issued by government sponsored entities
Held-to-Maturity
Held-to-maturity, Amortized Cost	362,917	378,264
Unrealized Gains	8,593	3,107
Unrealized Losses	17	812
Fair value of investment securities held-to-maturity	$ 371,493	$ 380,559

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

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

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

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Amount of accumulated unrealized loss on 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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