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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 3,185,249	$ 2,344,174
Gross Unrealized Holding Gain, Available-for-sale	28,562	55,099
Gross Unrealized Holding Loss, Available-for-sale	(29,888)	(350)
Fair Value, Available-for-sale	$ 3,183,923	$ 2,398,923
Total Percent, Available-for-sale	100.00%	100.00%
Amortized Cost, Held-to-maturity	$ 1,925,970	$ 578,626
Gross Unrealized Holding Gain, Held-to-maturity	15,326	25,703
Gross Unrealized Holding Loss, Held-to-maturity	(19,603)	(106)
Fair Value, Held-to-maturity	$ 1,921,693	$ 604,223
Total Percent, Held-to-maturity	100.00%	100.00%
CMO/REMIC [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 602,555	$ 457,548
Gross Unrealized Holding Gain, Available-for-sale	1,586	5,515
Gross Unrealized Holding Loss, Available-for-sale	(13,983)	(249)
Fair Value, Available-for-sale	$ 590,158	$ 462,814
Total Percent, Available-for-sale	18.53%	19.29%
Amortized Cost, Held-to-maturity	$ 490,670	$ 145,309
Gross Unrealized Holding Gain, Held-to-maturity	596	5,202
Gross Unrealized Holding Loss, Held-to-maturity	(5,030)	0
Fair Value, Held-to-maturity	$ 486,236	$ 150,511
Total Percent, Held-to-maturity	25.48%	25.11%
Government Agency/GSE [Member]
Schedule of Investments [Line Items]
Amortized Cost, Held-to-maturity	$ 576,899	$ 98,663
Gross Unrealized Holding Gain, Held-to-maturity	5,907	5,877
Gross Unrealized Holding Loss, Held-to-maturity	(7,312)	0
Fair Value, Held-to-maturity	$ 575,494	$ 104,540
Total Percent, Held-to-maturity	29.95%	17.05%
Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 2,553,246	$ 1,857,030
Gross Unrealized Holding Gain, Available-for-sale	25,873	48,006
Gross Unrealized Holding Loss, Available-for-sale	(15,905)	(101)
Fair Value, Available-for-sale	$ 2,563,214	$ 1,904,935
Total Percent, Available-for-sale	80.50%	79.41%
Amortized Cost, Held-to-maturity	$ 647,390	$ 146,382
Gross Unrealized Holding Gain, Held-to-maturity	4,109	7,644
Gross Unrealized Holding Loss, Held-to-maturity	(6,106)	(32)
Fair Value, Held-to-maturity	$ 645,393	$ 153,994
Total Percent, Held-to-maturity	33.61%	25.30%
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 28,365	$ 28,707
Gross Unrealized Holding Gain, Available-for-sale	1,103	1,578
Gross Unrealized Holding Loss, Available-for-sale		0
Fair Value, Available-for-sale	$ 29,468	$ 30,285
Total Percent, Available-for-sale	0.93%	1.26%
Amortized Cost, Held-to-maturity	$ 211,011	$ 188,272
Gross Unrealized Holding Gain, Held-to-maturity	4,714	6,980
Gross Unrealized Holding Loss, Held-to-maturity	(1,155)	(74)
Fair Value, Held-to-maturity	$ 214,570	$ 195,178
Total Percent, Held-to-maturity	10.96%	32.54%
Other Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,083	$ 889
Gross Unrealized Holding Gain, Available-for-sale
Gross Unrealized Holding Loss, Available-for-sale
Fair Value, Available-for-sale	$ 1,083	$ 889
Total Percent, Available-for-sale	0.04%	0.04%

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