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Securities - Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 409,110 | $ 493,691
Unrealized Gains | 4,798 | 7,683
Unrealized Losses | (4,199) | (5,539)
Fair Value | 409,709 | 495,835
U.S. Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 108,578 | 139,823
Unrealized Gains | 478 | 1,107
Unrealized Losses | (908) | (579)
Fair Value | 108,148 | 140,351
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 134,428 | 153,492
Unrealized Gains | 3,609 | 4,194
Unrealized Losses | (314) | (649)
Fair Value | 137,723 | 157,037
Residential and Multi-Family Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 111,214 | 136,807
Unrealized Gains | 304 | 551
Unrealized Losses | (1,882) | (2,382)
Fair Value | 109,636 | 134,976
Corporate Notes and Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 17,610 | 18,299
Unrealized Gains | 52 | 77
Unrealized Losses | (462) | (962)
Fair Value | 17,200 | 17,414
Pooled Trust Preferred [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 0 | 800
Unrealized Gains | 0 | 1,249
Unrealized Losses | 0 | 0
Fair Value | 0 | 2,049
Pooled SBA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 36,260 | 43,450
Unrealized Gains | 355 | 505
Unrealized Losses | (575) | (918)
Fair Value | 36,040 | 43,037
Other Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,020 | 1,020
Unrealized Gains | 0 | 0
Unrealized Losses | (58) | (49)
Fair Value | $ 962 | $ 971

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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 Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity 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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