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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,621,236 | $ 1,718,357
Gross Unrealized Holding Gain, Available-for-sale | 58,519 | 23,548
Gross Unrealized Holding Loss, Available-for-sale | 0 | (1,648)
Fair Value, Available-for-sale | $ 1,679,755 | $ 1,740,257
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 642,255 | $ 674,452
Gross Unrealized Holding Gain, Held-to-maturity | 16,295 | 8,230
Gross Unrealized Holding Loss, Held-to-maturity | (731) | (3,734)
Fair Value, Held-to-maturity | $ 657,819 | $ 678,948
Total Percent, Held-to-maturity | 100.00% | 100.00%
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 466,033 | $ 493,214
Gross Unrealized Holding Gain, Available-for-sale | 14,060 | 1,392
Gross Unrealized Holding Loss, Available-for-sale | 0 | (896)
Fair Value, Available-for-sale | $ 480,093 | $ 493,710
Total Percent, Available-for-sale | 28.58% | 28.37%
Amortized Cost, Held-to-maturity | $ 184,316 | $ 192,548
Gross Unrealized Holding Gain, Held-to-maturity | 591 | 0
Gross Unrealized Holding Loss, Held-to-maturity | (98) | (2,458)
Fair Value, Held-to-maturity | $ 184,809 | $ 190,090
Total Percent, Held-to-maturity | 28.70% | 28.55%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Held-to-maturity | $ 111,452 | $ 117,366
Gross Unrealized Holding Gain, Held-to-maturity | 3,468 | 2,280
Gross Unrealized Holding Loss, Held-to-maturity | (207) | (657)
Fair Value, Held-to-maturity | $ 114,713 | $ 118,989
Total Percent, Held-to-maturity | 17.35% | 17.40%
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,118,385 | $ 1,185,757
Gross Unrealized Holding Gain, Available-for-sale | 43,546 | 21,306
Gross Unrealized Holding Loss, Available-for-sale | 0 | (750)
Fair Value, Available-for-sale | $ 1,161,931 | $ 1,206,313
Total Percent, Available-for-sale | 69.18% | 69.32%
Amortized Cost, Held-to-maturity | $ 161,983 | $ 168,479
Gross Unrealized Holding Gain, Held-to-maturity | 8,182 | 2,083
Gross Unrealized Holding Loss, Held-to-maturity | 0 | (54)
Fair Value, Held-to-maturity | $ 170,165 | $ 170,508
Total Percent, Held-to-maturity | 25.22% | 24.98%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 36,119 | $ 38,506
Gross Unrealized Holding Gain, Available-for-sale | 913 | 850
Gross Unrealized Holding Loss, Available-for-sale | 0 | (2)
Fair Value, Available-for-sale | $ 37,032 | $ 39,354
Total Percent, Available-for-sale | 2.20% | 2.26%
Amortized Cost, Held-to-maturity | $ 184,504 | $ 196,059
Gross Unrealized Holding Gain, Held-to-maturity | 4,054 | 3,867
Gross Unrealized Holding Loss, Held-to-maturity | (426) | (565)
Fair Value, Held-to-maturity | $ 188,132 | $ 199,361
Total Percent, Held-to-maturity | 28.73% | 29.07%
Other Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 699 | $ 880
Gross Unrealized Holding Gain, Available-for-sale | 0 | 0
Gross Unrealized Holding Loss, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | $ 699 | $ 880
Total Percent, Available-for-sale | 0.04% | 0.05%

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