Investment Securities (Investment Securities Held to Maturity) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 473,704,000us-gaap_HeldToMaturitySecurities	$ 469,528,000us-gaap_HeldToMaturitySecurities
Gross unrealized gains	14,910,000	13,983,000
Gross unrealized losses	(943,000)	(1,038,000)
Fair value	487,671,000	482,473,000
Agency Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	7,131,000	6,813,000
Gross unrealized gains	21,000	17,000
Gross unrealized losses	(9,000)	(20,000)
Fair value	7,143,000	6,810,000
Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	2,511,000	2,816,000
Gross unrealized gains	109,000	123,000
Gross unrealized losses	0	0
Fair value	2,620,000	2,939,000
State and Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	453,339,000	449,410,000
Gross unrealized gains	14,715,000	13,814,000
Gross unrealized losses	(933,000)	(986,000)
Fair value	467,121,000	462,238,000
Corporate Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	10,723,000	10,489,000
Gross unrealized gains	65,000	29,000
Gross unrealized losses	(1,000)	(32,000)
Fair value	$ 10,787,000	$ 10,486,000

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 50

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