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Investment Securities - Summary Information Regarding Investment Securities Classified as Available for Sale and Held to Maturity (Detail) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | $ 202,076,000 | $ 183,712,000
Available for sale, Gross Unrealized Gains | 1,309,000 | 1,377,000
Available for sale, Gross Unrealized Losses, Less Than 1 Year | 748,000 | 1,025,000
Available for sale, Gross Unrealized Losses, Over 1 Year | 441,000 | 334,000
Total available for sale, Fair Value | 202,196,322 | 183,729,857
Held to maturity, Amortized Cost | 13,117,994 | 13,365,479
Held to maturity, Gross Unrealized Gains | 144,000 | 69,000
Held to maturity, Gross Unrealized Losses, Less Than 1 Year | 16,000 | 72,000
Held to maturity, Gross Unrealized Losses, Over 1 Year | 0 | 0
Total held to maturity, Fair Value | 13,246,498 | 13,362,062
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | 18,202,000 | 21,212,000
Available for sale, Gross Unrealized Gains | 292,000 | 260,000
Available for sale, Gross Unrealized Losses, Less Than 1 Year | 1,000 | 44,000
Total available for sale, Fair Value | 18,493,000 | 21,428,000
Held to maturity, Amortized Cost | 13,118,000 | 13,365,000
Held to maturity, Gross Unrealized Gains | 144,000 | 69,000
Held to maturity, Gross Unrealized Losses, Less Than 1 Year | 16,000 | 72,000
Held to maturity, Gross Unrealized Losses, Over 1 Year | 0 | 0
Total held to maturity, Fair Value | 13,246,000 | 13,362,000
U.S. Agency Mortgage-Backed [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | 74,699,000 | 78,361,000
Available for sale, Gross Unrealized Gains | 835,000 | 938,000
Available for sale, Gross Unrealized Losses, Less Than 1 Year | 223,000 | 368,000
Available for sale, Gross Unrealized Losses, Over 1 Year | 57,000 |
Total available for sale, Fair Value | 75,254,000 | 78,931,000
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | 100,666,000 | 75,193,000
Available for sale, Gross Unrealized Gains | 108,000 | 84,000
Available for sale, Gross Unrealized Losses, Less Than 1 Year | 517,000 | 613,000
Available for sale, Gross Unrealized Losses, Over 1 Year | 384,000 | 334,000
Total available for sale, Fair Value | 99,873,000 | 74,330,000
U.S. Government Agency [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | 8,509,000 | 8,946,000
Available for sale, Gross Unrealized Gains | 74,000 | 95,000
Available for sale, Gross Unrealized Losses, Less Than 1 Year | 7,000 |
Total available for sale, Fair Value | $ 8,576,000 | $ 9,041,000

X
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: 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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- 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) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- 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 less than twelve months. + 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) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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