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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 581,874 | $ 581,992
Gross Unrealized Gain | 233 | 2,096
Gross Unrealized Loss | 11,756 | 5,284
Estimated Fair Value | 570,351 | 578,804
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 322,186 |
Gross Unrealized Gain | 6 |
Gross Unrealized Loss | 7,223 |
Estimated Fair Value | 314,969 |
Collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 127,125 |
Gross Unrealized Gain | 8 |
Gross Unrealized Loss | 2,945 |
Estimated Fair Value | 124,188 |
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 306,166
Gross Unrealized Gain |  | 145
Gross Unrealized Loss |  | 2,702
Estimated Fair Value |  | 303,609
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 | 131 | 85
Estimated Fair Value | 7,368 | 7,414
Municipal bonds-tax exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 125,064 | 125,601
Gross Unrealized Gain | 219 | 1,943
Gross Unrealized Loss | 1,457 | 69
Estimated Fair Value | $ 123,826 | 127,475
U.S treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 152
Gross Unrealized Gain |  | 0
Gross Unrealized Loss |  | 0
Estimated Fair Value |  | 152
Mutual funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 22,916
Gross Unrealized Gain |  | 0
Gross Unrealized Loss |  | 530
Estimated Fair Value |  | 22,386
Collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 119,658
Gross Unrealized Gain |  | 8
Gross Unrealized Loss |  | 1,898
Estimated Fair Value |  | $ 117,768

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