Investment Securities (Securities Available for Sale) (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,011,433	$ 957,938
Gross unrealized gains	20,998	10,153
Gross unrealized losses	(196)	(3,557)
Fair value	1,032,235	964,534
US Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	7,998	8,006
Gross unrealized gains	33	0
Gross unrealized losses	0	(2)
Fair value	8,031	8,004
Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	69,169	82,396
Gross unrealized gains	221	82
Gross unrealized losses	0	(148)
Fair value	69,390	82,330
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	915,693	857,430
Gross unrealized gains	20,275	9,828
Gross unrealized losses	(187)	(3,397)
Fair value	935,781	863,861
State And Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	4,162	4,193
Gross unrealized gains	191	115
Gross unrealized losses	0	0
Fair value	4,353	4,308
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	14,014	5,516
Gross unrealized gains	127	6
Gross unrealized losses	(9)	(10)
Fair value	14,132	5,512
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	397	397
Gross unrealized gains	151	122
Gross unrealized losses	0	0
Fair value	$ 548	$ 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=65884222&loc=d3e22054-111558

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