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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 578,621 | $ 581,992
Gross Unrealized Gain | 82 | 2,096
Gross Unrealized Loss | 13,174 | 5,284
Estimated Fair Value | 565,529 | 578,804
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 331,126 | 306,166
Gross Unrealized Gain | 1 | 145
Gross Unrealized Loss | 8,276 | 2,702
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 124,761 | 119,658
Gross Unrealized Gain | 7 | 8
Gross Unrealized Loss | 3,379 | 1,898
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 | 139 | 85
Municipal bonds-tax exempt [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 115,235 | 125,601
Gross Unrealized Gain | 74 | 1,943
Gross Unrealized Loss | $ 1,380 | 69
U.S treasury securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 152
Gross Unrealized Gain |  | 0
Gross Unrealized Loss |  | 0
Mutual funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 22,916
Gross Unrealized Gain |  | 0
Gross Unrealized Loss |  | $ 530

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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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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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