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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 581,992 | $ 521,053
Gross Unrealized Gain | 2,096 | 1,164
Gross Unrealized Loss | 5,284 | 5,253
Estimated Fair Value | 578,804 | 516,964
Collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 119,658 | 77,447
Gross Unrealized Gain | 8 | 6
Gross Unrealized Loss | 1,898 | 1,002
Estimated Fair Value | 117,768 | 76,451
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 306,166 | 230,489
Gross Unrealized Gain | 145 | 598
Gross Unrealized Loss | 2,702 | 1,457
Estimated Fair Value | 303,609 | 229,630
U.S. government agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,499 | 7,499
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 85 | 58
Estimated Fair Value | 7,414 | 7,441
SBA loan pool securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 4,356
Gross Unrealized Gain |  | 0
Gross Unrealized Loss |  | 210
Estimated Fair Value |  | 4,146
Municipal bonds-tax exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 125,601 | 159,789
Gross Unrealized Gain | 1,943 | 236
Gross Unrealized Loss | 69 | 1,995
Estimated Fair Value | 127,475 | 158,030
Municipal bonds-taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 13,391
Gross Unrealized Gain |  | 319
Gross Unrealized Loss |  | 9
Estimated Fair Value |  | 13,701
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 5,010
Gross Unrealized Gain |  | 5
Gross Unrealized Loss |  | 0
Estimated Fair Value |  | 5,015
U.S. treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 152 | 156
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Estimated Fair Value | 152 | 156
Other securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 22,916 | 22,916
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 530 | 522
Estimated Fair Value | $ 22,386 | $ 22,394

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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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