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Securities Available for Sale - Additional Information (Detail) | 12 Months Ended
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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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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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