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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 2,344,174	$ 1,718,357
Gross Unrealized Holding Gain, Available-for-sale	55,099	23,548
Gross Unrealized Holding Loss, Available-for-sale	(350)	(1,648)
Fair Value, Available-for-sale	$ 2,398,923	$ 1,740,257
Total Percent, Available-for-sale	100.00%	100.00%
Amortized Cost, Held-to-maturity	$ 578,626	$ 674,452
Gross Unrealized Holding Gain, Held-to-maturity	25,703	8,230
Gross Unrealized Holding Loss, Held-to-maturity	(106)	(3,734)
Fair Value, Held-to-maturity	$ 604,223	$ 678,948
Total Percent, Held-to-maturity	100.00%	100.00%
CMO/REMIC [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 457,548	$ 493,214
Gross Unrealized Holding Gain, Available-for-sale	5,515	1,392
Gross Unrealized Holding Loss, Available-for-sale	(249)	(896)
Fair Value, Available-for-sale	$ 462,814	$ 493,710
Total Percent, Available-for-sale	19.29%	28.37%
Amortized Cost, Held-to-maturity	$ 145,309	$ 192,548
Gross Unrealized Holding Gain, Held-to-maturity	5,202
Gross Unrealized Holding Loss, Held-to-maturity		(2,458)
Fair Value, Held-to-maturity	$ 150,511	$ 190,090
Total Percent, Held-to-maturity	25.11%	28.55%
Government Agency/GSE [Member]
Schedule of Investments [Line Items]
Amortized Cost, Held-to-maturity	$ 98,663	$ 117,366
Gross Unrealized Holding Gain, Held-to-maturity	5,877	2,280
Gross Unrealized Holding Loss, Held-to-maturity		(657)
Fair Value, Held-to-maturity	$ 104,540	$ 118,989
Total Percent, Held-to-maturity	17.05%	17.40%
Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,857,030	$ 1,185,757
Gross Unrealized Holding Gain, Available-for-sale	48,006	21,306
Gross Unrealized Holding Loss, Available-for-sale	(101)	(750)
Fair Value, Available-for-sale	$ 1,904,935	$ 1,206,313
Total Percent, Available-for-sale	79.41%	69.32%
Amortized Cost, Held-to-maturity	$ 146,382	$ 168,479
Gross Unrealized Holding Gain, Held-to-maturity	7,644	2,083
Gross Unrealized Holding Loss, Held-to-maturity	(32)	(54)
Fair Value, Held-to-maturity	$ 153,994	$ 170,508
Total Percent, Held-to-maturity	25.30%	24.98%
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 28,707	$ 38,506
Gross Unrealized Holding Gain, Available-for-sale	1,578	850
Gross Unrealized Holding Loss, Available-for-sale		(2)
Fair Value, Available-for-sale	$ 30,285	$ 39,354
Total Percent, Available-for-sale	1.26%	2.26%
Amortized Cost, Held-to-maturity	$ 188,272	$ 196,059
Gross Unrealized Holding Gain, Held-to-maturity	6,980	3,867
Gross Unrealized Holding Loss, Held-to-maturity	(74)	(565)
Fair Value, Held-to-maturity	$ 195,178	$ 199,361
Total Percent, Held-to-maturity	32.54%	29.07%
Other Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 889	$ 880
Fair Value, Available-for-sale	$ 889	$ 880
Total Percent, Available-for-sale	0.04%	0.05%

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