Securities Available for Sale - Securities Available for Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 957,938	$ 1,061,461
Gross unrealized gains	10,153	16,164
Gross unrealized losses	(3,557)	(3,230)
Securities available for sale, at fair value	964,534	1,074,395
US Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	8,006	8,016
Gross unrealized gains	0	3
Gross unrealized losses	(2)	(3)
Securities available for sale, at fair value	8,004	8,016
Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	82,396	94,871
Gross unrealized gains	82	268
Gross unrealized losses	(148)	(63)
Securities available for sale, at fair value	82,330	95,076
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	857,430	944,796
Gross unrealized gains	9,828	15,610
Gross unrealized losses	(3,397)	(3,149)
Securities available for sale, at fair value	863,861	957,257
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	4,193	6,855
Gross unrealized gains	115	147
Gross unrealized losses	0	0
Securities available for sale, at fair value	4,308	7,002
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,516	6,526
Gross unrealized gains	6	9
Gross unrealized losses	(10)	(15)
Securities available for sale, at fair value	5,512	6,520
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	397	397
Gross unrealized gains	122	127
Gross unrealized losses	0	0
Securities available for sale, at fair value	$ 519	$ 524

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
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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Amount before tax of unrealized gain 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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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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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