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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
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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