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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 2,150,364 | $ 1,718,357
Gross Unrealized Holding Gain, Available-for-sale | 55,496 | 23,548
Gross Unrealized Holding Loss, Available-for-sale | (214) | (1,648)
Fair Value, Available-for-sale | $ 2,205,646 | $ 1,740,257
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 577,694 | $ 674,452
Gross Unrealized Holding Gain, Held-to-maturity | 26,166 | 8,230
Gross Unrealized Holding Loss, Held-to-maturity | (338) | (3,734)
Fair Value, Held-to-maturity | $ 603,522 | $ 678,948
Total Percent, Held-to-maturity | 100.00% | 100.00%
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 404,380 | $ 493,214
Gross Unrealized Holding Gain, Available-for-sale | 7,326 | 1,392
Gross Unrealized Holding Loss, Available-for-sale | (212) | (896)
Fair Value, Available-for-sale | $ 411,494 | $ 493,710
Total Percent, Available-for-sale | 18.66% | 28.37%
Amortized Cost, Held-to-maturity | $ 159,676 | $ 192,548
Gross Unrealized Holding Gain, Held-to-maturity | 5,315 |
Gross Unrealized Holding Loss, Held-to-maturity |  | (2,458)
Fair Value, Held-to-maturity | $ 164,991 | $ 190,090
Total Percent, Held-to-maturity | 27.64% | 28.55%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Held-to-maturity | $ 103,317 | $ 117,366
Gross Unrealized Holding Gain, Held-to-maturity | 6,627 | 2,280
Gross Unrealized Holding Loss, Held-to-maturity |  | (657)
Fair Value, Held-to-maturity | $ 109,944 | $ 118,989
Total Percent, Held-to-maturity | 17.88% | 17.40%
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,710,160 | $ 1,185,757
Gross Unrealized Holding Gain, Available-for-sale | 46,713 | 21,306
Gross Unrealized Holding Loss, Available-for-sale | (2) | (750)
Fair Value, Available-for-sale | $ 1,756,871 | $ 1,206,313
Total Percent, Available-for-sale | 79.65% | 69.32%
Amortized Cost, Held-to-maturity | $ 152,285 | $ 168,479
Gross Unrealized Holding Gain, Held-to-maturity | 7,837 | 2,083
Gross Unrealized Holding Loss, Held-to-maturity |  | (54)
Fair Value, Held-to-maturity | $ 160,122 | $ 170,508
Total Percent, Held-to-maturity | 26.36% | 24.98%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 35,011 | $ 38,506
Gross Unrealized Holding Gain, Available-for-sale | 1,457 | 850
Gross Unrealized Holding Loss, Available-for-sale |  | (2)
Fair Value, Available-for-sale | $ 36,468 | $ 39,354
Total Percent, Available-for-sale | 1.65% | 2.26%
Amortized Cost, Held-to-maturity | $ 162,416 | $ 196,059
Gross Unrealized Holding Gain, Held-to-maturity | 6,387 | 3,867
Gross Unrealized Holding Loss, Held-to-maturity | (338) | (565)
Fair Value, Held-to-maturity | $ 168,465 | $ 199,361
Total Percent, Held-to-maturity | 28.12% | 29.07%
Other Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 813 | $ 880
Gross Unrealized Holding Gain, Available-for-sale |  |
Gross Unrealized Holding Loss, Available-for-sale |  |
Fair Value, Available-for-sale | $ 813 | $ 880
Total Percent, Available-for-sale | 0.04% | 0.05%

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