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Securities Available for Sale - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($) security	Dec. 31, 2016 USD ($) security	Dec. 31, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale at carrying value	$ 939,400,000	$ 720,400,000
Amortized cost	1,042,285,000	1,041,247,000
Securities available for sale, at fair value	1,037,812,000	1,040,386,000
Proceeds from the sale of securities available for sale	$ 0	3,401,000	$ 14,005,000
Gross gains from sale of available for sale securities		95,000
Gross losses from sale of available for sale securities		$ 45,000
Number of securities in an unrealized loss position | security	122	87
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 48,320,000
Securities available for sale, at fair value	48,787,000
Proceeds from the sale of securities available for sale	0	$ 3,400,000
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	993,548,000	952,992,000
Securities available for sale, at fair value	988,367,000	951,861,000
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	417,000	397,000
Securities available for sale, at fair value	658,000	$ 549,000
Private Label Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 99,000
Number of securities in an unrealized loss position | security	2
Unrealized losses	$ 2,000

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Available For Sale Securities Gross Realized Gains Net Excluding Other Than Temporary Impairments

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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=75030427&loc=d3e22054-111558

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of loss realized on the sale of debt or equity securities classified as available-for-sale. Excludes other than temporary impairments (OTTI).

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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