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Securities - Summaries of Fair Values and Unrealized Losses of Securities, Segregated by Length of Impairment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014 Security	Dec. 31, 2013 Security
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year	56	54
Number of available for sale securities, Greater than 1 year	8	14
Number of available for sale securities	64	68
Securities Available For Sale, Less than 12 Months, Fair Value	$ 837,940	$ 734,257
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(14,714)	(26,101)
Securities Available For Sale, 12 Months or More, Fair Value	74,286	48,144
Securities Available For Sale, 12 Months or More, Unrealized Losses	(4,567)	(13,194)
Securities Available For Sale, Fair Value, Total	912,226	782,401
Securities Available For Sale, Unrealized Losses, Total	(19,281)	(39,295)
Number of held to maturity securities	78	80
Securities Held To Maturity, Less than 12 Months, Fair Value	698,818	669,220
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(13,945)	(24,379)
Securities Held To Maturity, Greater than 12 Months, Fair Value	82,658	15,674
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(4,102)	(711)
Securities Held To Maturity, Fair Value, Total	781,476	684,894
Securities Held To Maturity, Unrealized Losses, Total	(18,047)	(25,090)
Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities	72	78
Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities	6	2
U.S. Government-Sponsored Entities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year	18	17
Number of available for sale securities, Greater than 1 year
Number of available for sale securities	18	17
Securities Available For Sale, Less than 12 Months, Fair Value	249,631	232,962
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(3,699)	(5,904)
Securities Available For Sale, 12 Months or More, Fair Value
Securities Available For Sale, 12 Months or More, Unrealized Losses
Securities Available For Sale, Fair Value, Total	249,631	232,962
Securities Available For Sale, Unrealized Losses, Total	(3,699)	(5,904)
Number of held to maturity securities	8	3
Securities Held To Maturity, Less than 12 Months, Fair Value	73,748	24,513
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(788)	(530)
Securities Held To Maturity, Greater than 12 Months, Fair Value	14,504	14,378
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(496)	(621)
Securities Held To Maturity, Fair Value, Total	88,252	38,891
Securities Held To Maturity, Unrealized Losses, Total	(1,284)	(1,151)
U.S. Government-Sponsored Entities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities	7	2
U.S. Government-Sponsored Entities [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities	1	1
Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year	11	9
Number of available for sale securities, Greater than 1 year
Number of available for sale securities	11	9
Securities Available For Sale, Less than 12 Months, Fair Value	177,722	108,284
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(905)	(1,303)
Securities Available For Sale, 12 Months or More, Fair Value
Securities Available For Sale, 12 Months or More, Unrealized Losses
Securities Available For Sale, Fair Value, Total	177,722	108,284
Securities Available For Sale, Unrealized Losses, Total	(905)	(1,303)
Number of held to maturity securities	24	25
Securities Held To Maturity, Less than 12 Months, Fair Value	347,721	308,864
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(3,745)	(5,942)
Securities Held To Maturity, Greater than 12 Months, Fair Value	1,304	1,296
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(72)	(90)
Securities Held To Maturity, Fair Value, Total	349,025	310,160
Securities Held To Maturity, Unrealized Losses, Total	(3,817)	(6,032)
Agency Mortgage-Backed Securities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities	23	24
Agency Mortgage-Backed Securities [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities	1	1
Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year	24	26
Number of available for sale securities, Greater than 1 year	4	2
Number of available for sale securities	28	28
Securities Available For Sale, Less than 12 Months, Fair Value	398,335	389,989
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(9,937)	(18,644)
Securities Available For Sale, 12 Months or More, Fair Value	68,266	34,229
Securities Available For Sale, 12 Months or More, Unrealized Losses	(3,706)	(2,150)
Securities Available For Sale, Fair Value, Total	466,601	424,218
Securities Available For Sale, Unrealized Losses, Total	(13,643)	(20,794)
Number of held to maturity securities	24	21
Securities Held To Maturity, Less than 12 Months, Fair Value	249,082	301,312
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(8,442)	(15,844)
Securities Held To Maturity, Greater than 12 Months, Fair Value	66,850
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(3,534)
Securities Held To Maturity, Fair Value, Total	315,932	301,312
Securities Held To Maturity, Unrealized Losses, Total	(11,976)	(15,844)
Agency Collateralized Mortgage Obligations [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities	20	21
Agency Collateralized Mortgage Obligations [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities	4
Commercial Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year	1
Number of available for sale securities, Greater than 1 year
Number of available for sale securities	1
Securities Available For Sale, Less than 12 Months, Fair Value	9,129
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(24)
Securities Available For Sale, 12 Months or More, Fair Value
Securities Available For Sale, 12 Months or More, Unrealized Losses
Securities Available For Sale, Fair Value, Total	9,129
Securities Available For Sale, Unrealized Losses, Total	(24)
Number of held to maturity securities	1	1
Securities Held To Maturity, Less than 12 Months, Fair Value	1,005	984
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(15)	(37)
Securities Held To Maturity, Greater than 12 Months, Fair Value
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses
Securities Held To Maturity, Fair Value, Total	1,005	984
Securities Held To Maturity, Unrealized Losses, Total	(15)	(37)
Commercial Mortgage-Backed Securities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities	1	1
Commercial Mortgage-Backed Securities [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities
States of the U.S. and Political Subdivisions [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year	2	2
Number of available for sale securities, Greater than 1 year
Number of available for sale securities	2	2
Securities Available For Sale, Less than 12 Months, Fair Value	3,123	3,022
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(149)	(250)
Securities Available For Sale, 12 Months or More, Fair Value
Securities Available For Sale, 12 Months or More, Unrealized Losses
Securities Available For Sale, Fair Value, Total	3,123	3,022
Securities Available For Sale, Unrealized Losses, Total	(149)	(250)
Number of held to maturity securities	21	27
Securities Held To Maturity, Less than 12 Months, Fair Value	27,262	31,537
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(955)	(2,022)
Securities Held To Maturity, Greater than 12 Months, Fair Value
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses
Securities Held To Maturity, Fair Value, Total	27,262	31,537
Securities Held To Maturity, Unrealized Losses, Total	(955)	(2,022)
States of the U.S. and Political Subdivisions [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities	21	27
States of the U.S. and Political Subdivisions [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities
Other Debt Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year
Number of available for sale securities, Greater than 1 year	4	4
Number of available for sale securities	4	4
Securities Available For Sale, Less than 12 Months, Fair Value
Securities Available For Sale, Less than 12 Months, Unrealized Losses
Securities Available For Sale, 12 Months or More, Fair Value	6,020	5,950
Securities Available For Sale, 12 Months or More, Unrealized Losses	(861)	(929)
Securities Available For Sale, Fair Value, Total	6,020	5,950
Securities Available For Sale, Unrealized Losses, Total	(861)	(929)
Collateralized Debt Obligations [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year
Number of available for sale securities, Greater than 1 year		8
Number of available for sale securities		8
Securities Available For Sale, Less than 12 Months, Fair Value
Securities Available For Sale, Less than 12 Months, Unrealized Losses
Securities Available For Sale, 12 Months or More, Fair Value		7,965
Securities Available For Sale, 12 Months or More, Unrealized Losses		(10,115)
Securities Available For Sale, Fair Value, Total		7,965
Securities Available For Sale, Unrealized Losses, Total		(10,115)
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities		3
Securities Held To Maturity, Less than 12 Months, Fair Value		2,010
Securities Held To Maturity, Less than 12 Months, Unrealized Losses		(4)
Securities Held To Maturity, Greater than 12 Months, Fair Value
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses
Securities Held To Maturity, Fair Value, Total		2,010
Securities Held To Maturity, Unrealized Losses, Total		$ (4)
Non-Agency Collateralized Mortgage Obligations [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities		3
Non-Agency Collateralized Mortgage Obligations [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities

X

- Definition

Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for twelve months or longer impacting investments.

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Amount of accumulated pre-tax unrealized loss on investments on securities classified as available-for-sale securities impacting investments.

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Amount of accumulated pre-tax unrealized loss on investments in held-to-maturity securities that have been in a loss position for twelve months or longer.

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