Securities - Available for Sale Securities Unrealized Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]
Available for sale securities, Losses less than 12 months, Fair Value	$ 1,047,869	$ 147,898
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses	9,553	248
Available for sale securities, Losses 12 months or longer, Fair value	150,819	212,629
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses	3,908	3,891
Available for sale securities, Total, Fair value	1,198,688	360,527
Available for sale securities, Total, Gross Unrealized Losses	13,461	4,139
Equity Securities [Member]
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]
Available for sale securities, Losses less than 12 months, Fair Value	20	5,998
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses	1	10
Available for sale securities, Losses 12 months or longer, Fair value	1,473	3
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses	47	1
Available for sale securities, Total, Fair value	1,493	6,001
Available for sale securities, Total, Gross Unrealized Losses	48	11
U.S. Treasury and Government Agency Securities [Member]
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]
Available for sale securities, Losses less than 12 months, Fair Value		99,950
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses		70
Available for sale securities, Losses 12 months or longer, Fair value	82	121
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses	1	1
Available for sale securities, Total, Fair value	82	100,071
Available for sale securities, Total, Gross Unrealized Losses	1	71
Municipal Obligations [Member]
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]
Available for sale securities, Losses less than 12 months, Fair Value	8,296	2,995
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses	38	5
Available for sale securities, Total, Fair value	8,296	2,995
Available for sale securities, Total, Gross Unrealized Losses	38	5
Mortgage-Backed Securities [Member]
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]
Available for sale securities, Losses less than 12 months, Fair Value	831,156	38,955
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses	8,257	163
Available for sale securities, Losses 12 months or longer, Fair value	116,126	125,641
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses	2,925	2,660
Available for sale securities, Total, Fair value	947,282	164,596
Available for sale securities, Total, Gross Unrealized Losses	11,182	2,823
Collateralized Mortgage Obligations [Member]
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]
Available for sale securities, Losses less than 12 months, Fair Value	208,397
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses	1,257
Available for sale securities, Losses 12 months or longer, Fair value	33,138	86,864
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses	935	1,229
Available for sale securities, Total, Fair value	241,535	86,864
Available for sale securities, Total, Gross Unrealized Losses	$ 2,192	$ 1,229

Unrealized Loss And Fair Value Available For Sale Securities [Line Items]

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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