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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,584,687 | $ 1,757,666
Gross Unrealized Holding Gain, Available-for-sale | 18,125 | 2,033
Gross Unrealized Holding Loss, Available-for-sale | (2,792) | (25,614)
Fair Value, Available-for-sale | $ 1,600,020 | $ 1,734,085
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 728,113 | $ 744,440
Gross Unrealized Holding Gain, Held-to-maturity | 7,357 | 1,128
Gross Unrealized Holding Loss, Held-to-maturity | (6,438) | (24,031)
Fair Value, Held-to-maturity | $ 729,032 | $ 721,537
Total Percent, Held-to-maturity | 100.00% | 100.00%
CMO/REMIC - Residential [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 194,094 | $ 217,223
Gross Unrealized Holding Gain, Available-for-sale | 1,216 | 353
Gross Unrealized Holding Loss, Available-for-sale | (334) | (3,525)
Fair Value, Available-for-sale | $ 194,976 | $ 214,051
Total Percent, Available-for-sale | 12.19% | 12.34%
Amortized Cost, Held-to-maturity | $ 211,436 | $ 215,336
Gross Unrealized Holding Gain, Held-to-maturity | 5 | 0
Gross Unrealized Holding Loss, Held-to-maturity | (4,358) | (12,081)
Fair Value, Held-to-maturity | $ 207,083 | $ 203,255
Total Percent, Held-to-maturity | 29.04% | 28.93%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Held-to-maturity | $ 128,721 | $ 138,274
Gross Unrealized Holding Gain, Held-to-maturity | 2,627 | 572
Gross Unrealized Holding Loss, Held-to-maturity | (414) | (2,622)
Fair Value, Held-to-maturity | $ 130,934 | $ 136,224
Total Percent, Held-to-maturity | 17.68% | 18.57%
Residential Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,348,415 | $ 1,494,106
Gross Unrealized Holding Gain, Available-for-sale | 16,251 | 1,348
Gross Unrealized Holding Loss, Available-for-sale | (2,417) | (20,946)
Fair Value, Available-for-sale | $ 1,362,249 | $ 1,474,508
Total Percent, Available-for-sale | 85.14% | 85.03%
Amortized Cost, Held-to-maturity | $ 175,552 | $ 153,874
Gross Unrealized Holding Gain, Held-to-maturity | 1,480 | 0
Gross Unrealized Holding Loss, Held-to-maturity | (415) | (3,140)
Fair Value, Held-to-maturity | $ 176,617 | $ 150,734
Total Percent, Held-to-maturity | 24.11% | 20.67%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 41,369 | $ 45,621
Gross Unrealized Holding Gain, Available-for-sale | 658 | 332
Gross Unrealized Holding Loss, Available-for-sale | (41) | (1,143)
Fair Value, Available-for-sale | $ 41,986 | $ 44,810
Total Percent, Available-for-sale | 2.62% | 2.59%
Amortized Cost, Held-to-maturity | $ 212,404 | $ 236,956
Gross Unrealized Holding Gain, Held-to-maturity | 3,245 | 556
Gross Unrealized Holding Loss, Held-to-maturity | (1,251) | (6,188)
Fair Value, Held-to-maturity | $ 214,398 | $ 231,324
Total Percent, Held-to-maturity | 29.17% | 31.83%
Other Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 809 | $ 716
Gross Unrealized Holding Gain, Available-for-sale | 0 | 0
Gross Unrealized Holding Loss, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | $ 809 | $ 716
Total Percent, Available-for-sale | 0.05% | 0.04%

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