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Investment Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 477,652	$ 488,183
Gross unrealized gains	9,295	6,675
Gross unrealized losses	(1,908)	(5,571)
Fair value	485,039	489,287
Agency Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	4,308	4,306
Gross unrealized gains	0	2
Gross unrealized losses	(87)	(83)
Fair value	4,221	4,225
Mortgage-backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	382	893
Gross unrealized gains	14	31
Gross unrealized losses	0	0
Fair value	396	924
State and municipal obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	462,942	473,653
Gross unrealized gains	9,280	6,635
Gross unrealized losses	(1,738)	(5,436)
Fair value	470,484	474,852
Corporate Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	10,020	9,331
Gross unrealized gains	1	7
Gross unrealized losses	(83)	(52)
Fair value	$ 9,938	$ 9,286

X

- Definition

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

+ References

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-Publisher FASB
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