Investment Securities (Securities Available for Sale) (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,047,690	$ 1,041,247
Gross unrealized gains	7,562	7,558
Gross unrealized losses	(7,133)	(8,419)
Fair value	1,048,119	1,040,386
US Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	7,992	7,995
Gross unrealized gains	4	13
Gross unrealized losses	0	0
Fair value	7,996	8,008
Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	49,088	57,123
Gross unrealized gains	47	90
Gross unrealized losses	(27)	(25)
Fair value	49,108	57,188
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	967,483	952,992
Gross unrealized gains	6,930	7,249
Gross unrealized losses	(7,095)	(8,380)
Fair value	967,318	951,861
State And Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	3,717	3,727
Gross unrealized gains	74	19
Gross unrealized losses	0	(3)
Fair value	3,791	3,743
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	19,013	19,013
Gross unrealized gains	346	35
Gross unrealized losses	(11)	(11)
Fair value	19,348	19,037
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	397	397
Gross unrealized gains	161	152
Gross unrealized losses	0	0
Fair value	$ 558	$ 549

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
-Topic 320
-SubTopic 10
-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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