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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,618,811 | $ 1,718,357
Gross Unrealized Holding Gain, Available-for-sale | 57,268 | 23,548
Gross Unrealized Holding Loss, Available-for-sale | (12) | (1,648)
Fair Value, Available-for-sale | $ 1,676,067 | $ 1,740,257
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 613,169 | $ 674,452
Gross Unrealized Holding Gain, Held-to-maturity | 26,121 | 8,230
Gross Unrealized Holding Loss, Held-to-maturity | (340) | (3,734)
Fair Value, Held-to-maturity | $ 638,950 | $ 678,948
Total Percent, Held-to-maturity | 100.00% | 100.00%
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 391,586 | $ 493,214
Gross Unrealized Holding Gain, Available-for-sale | 8,962 | 1,392
Gross Unrealized Holding Loss, Available-for-sale | (12) | (896)
Fair Value, Available-for-sale | $ 400,536 | $ 493,710
Total Percent, Available-for-sale | 23.90% | 28.37%
Amortized Cost, Held-to-maturity | $ 171,821 | $ 192,548
Gross Unrealized Holding Gain, Held-to-maturity | 5,283 | 0
Gross Unrealized Holding Loss, Held-to-maturity | 0 | (2,458)
Fair Value, Held-to-maturity | $ 177,104 | $ 190,090
Total Percent, Held-to-maturity | 28.02% | 28.55%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Held-to-maturity | $ 106,981 | $ 117,366
Gross Unrealized Holding Gain, Held-to-maturity | 6,285 | 2,280
Gross Unrealized Holding Loss, Held-to-maturity | 0 | (657)
Fair Value, Held-to-maturity | $ 113,266 | $ 118,989
Total Percent, Held-to-maturity | 17.45% | 17.40%
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,191,431 | $ 1,185,757
Gross Unrealized Holding Gain, Available-for-sale | 46,868 | 21,306
Gross Unrealized Holding Loss, Available-for-sale | 0 | (750)
Fair Value, Available-for-sale | $ 1,238,299 | $ 1,206,313
Total Percent, Available-for-sale | 73.88% | 69.32%
Amortized Cost, Held-to-maturity | $ 164,174 | $ 168,479
Gross Unrealized Holding Gain, Held-to-maturity | 8,135 | 2,083
Gross Unrealized Holding Loss, Held-to-maturity | 0 | (54)
Fair Value, Held-to-maturity | $ 172,309 | $ 170,508
Total Percent, Held-to-maturity | 26.77% | 24.98%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 35,015 | $ 38,506
Gross Unrealized Holding Gain, Available-for-sale | 1,438 | 850
Gross Unrealized Holding Loss, Available-for-sale | 0 | (2)
Fair Value, Available-for-sale | $ 36,453 | $ 39,354
Total Percent, Available-for-sale | 2.17% | 2.26%
Amortized Cost, Held-to-maturity | $ 170,193 | $ 196,059
Gross Unrealized Holding Gain, Held-to-maturity | 6,418 | 3,867
Gross Unrealized Holding Loss, Held-to-maturity | (340) | (565)
Fair Value, Held-to-maturity | $ 176,271 | $ 199,361
Total Percent, Held-to-maturity | 27.76% | 29.07%
Other Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 779 | $ 880
Gross Unrealized Holding Gain, Available-for-sale | 0 | 0
Gross Unrealized Holding Loss, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | $ 779 | $ 880
Total Percent, Available-for-sale | 0.05% | 0.05%

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