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Securities Available-for-Sale - Fair Value and Age of Gross Unrealized Losses by Investment Category (Detail)	Jun. 30, 2016 USD ($) security	Dec. 31, 2015 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	1	23
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 70,000	$ 213,997,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (1,000)	$ (1,302,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0	3
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0	$ 24,014,000
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0	$ (414,000)
Available-for-sale, Securities, Number of Positions | security	1	26
Available-for-sale Securities, Fair Value, Total	$ 70,000	$ 238,011,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (1,000)	$ (1,716,000)
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	0
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 0
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ 0
Available-for-sale, Securities, Number of Positions | security	0
Available-for-sale Securities, Fair Value, Total	$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0
Obligations of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	0	10
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 0	$ 88,584,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (379,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0	2
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0	$ 14,542,000
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0	$ (188,000)
Available-for-sale, Securities, Number of Positions | security	0	12
Available-for-sale Securities, Fair Value, Total	$ 0	$ 103,126,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (567,000)
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	0	6
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 0	$ 61,211,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (316,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0	0
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0	$ 0
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0	$ 0
Available-for-sale, Securities, Number of Positions | security	0	6
Available-for-sale Securities, Fair Value, Total	$ 0	$ 61,211,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (316,000)
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	0	1
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 0	$ 7,993,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (151,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0	0
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0	$ 0
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0	$ 0
Available-for-sale, Securities, Number of Positions | security	0	1
Available-for-sale Securities, Fair Value, Total	$ 0	$ 7,993,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (151,000)
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	0	5
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 0	$ 50,839,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (450,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0	1
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0	$ 9,472,000
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0	$ (226,000)
Available-for-sale, Securities, Number of Positions | security	0	6
Available-for-sale Securities, Fair Value, Total	$ 0	$ 60,311,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (676,000)
Obligations of States and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	0	1
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 0	$ 5,370,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (6,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0	0
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0	$ 0
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0	$ 0
Available-for-sale, Securities, Number of Positions | security	0	1
Available-for-sale Securities, Fair Value, Total	$ 0	$ 5,370,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (6,000)
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	0	23
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 0	$ 213,997,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (1,302,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0	3
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0	$ 24,014,000
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0	$ (414,000)
Available-for-sale, Securities, Number of Positions | security	0	26
Available-for-sale Securities, Fair Value, Total	$ 0	$ 238,011,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (1,716,000)
Marketable Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	1
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 70,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (1,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0
Available-for-sale, Securities, Number of Positions | security	1	1
Available-for-sale Securities, Fair Value, Total	$ 70,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (1,000)	$ 0

X

- Definition

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)
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