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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 588,097 | $ 581,992
Gross Unrealized Gain | 66 | 2,096
Gross Unrealized Loss | 15,927 | 5,284
Estimated Fair Value | 572,236 | 578,804
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 308,054 | 306,166
Gross Unrealized Gain | 51 | 145
Gross Unrealized Loss | 9,719 | 2,702
Estimated Fair Value | 298,386 | 303,609
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 121,541 | 119,658
Gross Unrealized Gain | 6 | 8
Gross Unrealized Loss | 3,892 | 1,898
Estimated Fair Value | 117,655 | 117,768
U.S. government agency securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,499 | 7,499
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 147 | 85
Estimated Fair Value | 7,352 | 7,414
Municipal bonds-tax exempt [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 111,328 | 125,601
Gross Unrealized Gain | 9 | 1,943
Gross Unrealized Loss | 2,059 | 69
Estimated Fair Value | 109,278 | 127,475
U.S treasury securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 39,675 | 152
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 110 | 0
Estimated Fair Value | $ 39,565 | 152
Mutual funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 22,916
Gross Unrealized Gain |  | 0
Gross Unrealized Loss |  | 530
Estimated Fair Value |  | $ 22,386

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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