Investment Securities (Securities Available for Sale) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 965,852	$ 957,938
Gross unrealized gains	18,531	10,153
Gross unrealized losses	(177)	(3,557)
Fair value	984,206	964,534
US Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	8,003	8,006
Gross unrealized gains	44	0
Gross unrealized losses	0	(2)
Fair value	8,047	8,004
Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	79,307	82,396
Gross unrealized gains	296	82
Gross unrealized losses	(3)	(148)
Fair value	79,600	82,330
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	868,946	857,430
Gross unrealized gains	17,856	9,828
Gross unrealized losses	(161)	(3,397)
Fair value	886,641	863,861
State And Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	4,183	4,193
Gross unrealized gains	139	115
Gross unrealized losses	0	0
Fair value	4,322	4,308
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,016	5,516
Gross unrealized gains	72	6
Gross unrealized losses	(13)	(10)
Fair value	5,075	5,512
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	397	397
Gross unrealized gains	124	122
Gross unrealized losses	0	0
Fair value	$ 521	$ 519

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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