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Investment Securities - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 USD ($) Securities | Dec. 31, 2015 USD ($) Securities | Dec. 31, 2014 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of securities in an unrealized loss position | Securities | 82 | 107 |
Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio | 1.51% | 2.44% |
OTTI charges incurred | $ 4,646,000 |  | $ 737,000
Carrying amount of available-for-sale securities pledged | $ 139,750,000 | $ 236,730,000 |
Continuous Loss Position More Than Twelve Months |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of securities in an unrealized loss position | Securities | 15 |  |
Debt Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
OTTI charges incurred | $ 4,640,000 |  |
Non Agency Mortgage Backed Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
OTTI charges incurred |  |  | 705,000
Equity Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
OTTI charges incurred | $ 11,000 | $ 0 | $ 32,000

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- Definition Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio. + References No definition available. + Details
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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5086-111524 + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=73527792&loc=SL6284393-111563 + Details
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