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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,718,357 | $ 1,757,666
Gross Unrealized Holding Gain, Available-for-sale | 23,548 | 2,033
Gross Unrealized Holding Loss, Available-for-sale | (1,648) | (25,614)
Fair Value, Available-for-sale | $ 1,740,257 | $ 1,734,085
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 674,452 | $ 744,440
Gross Unrealized Holding Gain, Held-to-maturity | 8,230 | 1,128
Gross Unrealized Holding Loss, Held-to-maturity | (3,734) | (24,031)
Fair Value, Held-to-maturity | $ 678,948 | $ 721,537
Total Percent, Held-to-maturity | 100.00% | 100.00%
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 493,214 | $ 217,223
Gross Unrealized Holding Gain, Available-for-sale | 1,392 | 353
Gross Unrealized Holding Loss, Available-for-sale | (896) | (3,525)
Fair Value, Available-for-sale | $ 493,710 | $ 214,051
Total Percent, Available-for-sale | 28.37% | 12.34%
Amortized Cost, Held-to-maturity | $ 192,548 | $ 215,336
Gross Unrealized Holding Gain, Held-to-maturity | 0 | 0
Gross Unrealized Holding Loss, Held-to-maturity | (2,458) | (12,081)
Fair Value, Held-to-maturity | $ 190,090 | $ 203,255
Total Percent, Held-to-maturity | 28.55% | 28.93%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Held-to-maturity | $ 117,366 | $ 138,274
Gross Unrealized Holding Gain, Held-to-maturity | 2,280 | 572
Gross Unrealized Holding Loss, Held-to-maturity | (657) | (2,622)
Fair Value, Held-to-maturity | $ 118,989 | $ 136,224
Total Percent, Held-to-maturity | 17.40% | 18.57%
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,185,757 | $ 1,494,106
Gross Unrealized Holding Gain, Available-for-sale | 21,306 | 1,348
Gross Unrealized Holding Loss, Available-for-sale | (750) | (20,946)
Fair Value, Available-for-sale | $ 1,206,313 | $ 1,474,508
Total Percent, Available-for-sale | 69.32% | 85.03%
Amortized Cost, Held-to-maturity | $ 168,479 | $ 153,874
Gross Unrealized Holding Gain, Held-to-maturity | 2,083 | 0
Gross Unrealized Holding Loss, Held-to-maturity | (54) | (3,140)
Fair Value, Held-to-maturity | $ 170,508 | $ 150,734
Total Percent, Held-to-maturity | 24.98% | 20.67%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 38,506 | $ 45,621
Gross Unrealized Holding Gain, Available-for-sale | 850 | 332
Gross Unrealized Holding Loss, Available-for-sale | (2) | (1,143)
Fair Value, Available-for-sale | $ 39,354 | $ 44,810
Total Percent, Available-for-sale | 2.26% | 2.59%
Amortized Cost, Held-to-maturity | $ 196,059 | $ 236,956
Gross Unrealized Holding Gain, Held-to-maturity | 3,867 | 556
Gross Unrealized Holding Loss, Held-to-maturity | (565) | (6,188)
Fair Value, Held-to-maturity | $ 199,361 | $ 231,324
Total Percent, Held-to-maturity | 29.07% | 31.83%
Other Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 880 | $ 716
Gross Unrealized Holding Gain, Available-for-sale | 0 | 0
Gross Unrealized Holding Loss, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | $ 880 | $ 716
Total Percent, Available-for-sale | 0.05% | 0.04%

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