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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,618,811	$ 1,718,357
Gross Unrealized Holding Gain, Available-for-sale	57,268	23,548
Gross Unrealized Holding Loss, Available-for-sale	(12)	(1,648)
Fair Value, Available-for-sale	$ 1,676,067	$ 1,740,257
Total Percent, Available-for-sale	100.00%	100.00%
Amortized Cost, Held-to-maturity	$ 613,169	$ 674,452
Gross Unrealized Holding Gain, Held-to-maturity	26,121	8,230
Gross Unrealized Holding Loss, Held-to-maturity	(340)	(3,734)
Fair Value, Held-to-maturity	$ 638,950	$ 678,948
Total Percent, Held-to-maturity	100.00%	100.00%
CMO/REMIC [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 391,586	$ 493,214
Gross Unrealized Holding Gain, Available-for-sale	8,962	1,392
Gross Unrealized Holding Loss, Available-for-sale	(12)	(896)
Fair Value, Available-for-sale	$ 400,536	$ 493,710
Total Percent, Available-for-sale	23.90%	28.37%
Amortized Cost, Held-to-maturity	$ 171,821	$ 192,548
Gross Unrealized Holding Gain, Held-to-maturity	5,283	0
Gross Unrealized Holding Loss, Held-to-maturity	0	(2,458)
Fair Value, Held-to-maturity	$ 177,104	$ 190,090
Total Percent, Held-to-maturity	28.02%	28.55%
Government Agency/GSE [Member]
Schedule of Investments [Line Items]
Amortized Cost, Held-to-maturity	$ 106,981	$ 117,366
Gross Unrealized Holding Gain, Held-to-maturity	6,285	2,280
Gross Unrealized Holding Loss, Held-to-maturity	0	(657)
Fair Value, Held-to-maturity	$ 113,266	$ 118,989
Total Percent, Held-to-maturity	17.45%	17.40%
Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,191,431	$ 1,185,757
Gross Unrealized Holding Gain, Available-for-sale	46,868	21,306
Gross Unrealized Holding Loss, Available-for-sale	0	(750)
Fair Value, Available-for-sale	$ 1,238,299	$ 1,206,313
Total Percent, Available-for-sale	73.88%	69.32%
Amortized Cost, Held-to-maturity	$ 164,174	$ 168,479
Gross Unrealized Holding Gain, Held-to-maturity	8,135	2,083
Gross Unrealized Holding Loss, Held-to-maturity	0	(54)
Fair Value, Held-to-maturity	$ 172,309	$ 170,508
Total Percent, Held-to-maturity	26.77%	24.98%
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 35,015	$ 38,506
Gross Unrealized Holding Gain, Available-for-sale	1,438	850
Gross Unrealized Holding Loss, Available-for-sale	0	(2)
Fair Value, Available-for-sale	$ 36,453	$ 39,354
Total Percent, Available-for-sale	2.17%	2.26%
Amortized Cost, Held-to-maturity	$ 170,193	$ 196,059
Gross Unrealized Holding Gain, Held-to-maturity	6,418	3,867
Gross Unrealized Holding Loss, Held-to-maturity	(340)	(565)
Fair Value, Held-to-maturity	$ 176,271	$ 199,361
Total Percent, Held-to-maturity	27.76%	29.07%
Other Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 779	$ 880
Gross Unrealized Holding Gain, Available-for-sale	0	0
Gross Unrealized Holding Loss, Available-for-sale	0	0
Fair Value, Available-for-sale	$ 779	$ 880
Total Percent, Available-for-sale	0.05%	0.05%

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