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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,718,357	$ 1,757,666
Gross Unrealized Holding Gain, Available-for-sale	23,548	2,033
Gross Unrealized Holding Loss, Available-for-sale	(1,648)	(25,614)
Fair Value, Available-for-sale	$ 1,740,257	$ 1,734,085
Total Percent, Available-for-sale	100.00%	100.00%
Amortized Cost, Held-to-maturity	$ 674,452	$ 744,440
Gross Unrealized Holding Gain, Held-to-maturity	8,230	1,128
Gross Unrealized Holding Loss, Held-to-maturity	(3,734)	(24,031)
Fair Value, Held-to-maturity	$ 678,948	$ 721,537
Total Percent, Held-to-maturity	100.00%	100.00%
CMO/REMIC [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 493,214	$ 217,223
Gross Unrealized Holding Gain, Available-for-sale	1,392	353
Gross Unrealized Holding Loss, Available-for-sale	(896)	(3,525)
Fair Value, Available-for-sale	$ 493,710	$ 214,051
Total Percent, Available-for-sale	28.37%	12.34%
Amortized Cost, Held-to-maturity	$ 192,548	$ 215,336
Gross Unrealized Holding Gain, Held-to-maturity	0	0
Gross Unrealized Holding Loss, Held-to-maturity	(2,458)	(12,081)
Fair Value, Held-to-maturity	$ 190,090	$ 203,255
Total Percent, Held-to-maturity	28.55%	28.93%
Government Agency/GSE [Member]
Schedule of Investments [Line Items]
Amortized Cost, Held-to-maturity	$ 117,366	$ 138,274
Gross Unrealized Holding Gain, Held-to-maturity	2,280	572
Gross Unrealized Holding Loss, Held-to-maturity	(657)	(2,622)
Fair Value, Held-to-maturity	$ 118,989	$ 136,224
Total Percent, Held-to-maturity	17.40%	18.57%
Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,185,757	$ 1,494,106
Gross Unrealized Holding Gain, Available-for-sale	21,306	1,348
Gross Unrealized Holding Loss, Available-for-sale	(750)	(20,946)
Fair Value, Available-for-sale	$ 1,206,313	$ 1,474,508
Total Percent, Available-for-sale	69.32%	85.03%
Amortized Cost, Held-to-maturity	$ 168,479	$ 153,874
Gross Unrealized Holding Gain, Held-to-maturity	2,083	0
Gross Unrealized Holding Loss, Held-to-maturity	(54)	(3,140)
Fair Value, Held-to-maturity	$ 170,508	$ 150,734
Total Percent, Held-to-maturity	24.98%	20.67%
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 38,506	$ 45,621
Gross Unrealized Holding Gain, Available-for-sale	850	332
Gross Unrealized Holding Loss, Available-for-sale	(2)	(1,143)
Fair Value, Available-for-sale	$ 39,354	$ 44,810
Total Percent, Available-for-sale	2.26%	2.59%
Amortized Cost, Held-to-maturity	$ 196,059	$ 236,956
Gross Unrealized Holding Gain, Held-to-maturity	3,867	556
Gross Unrealized Holding Loss, Held-to-maturity	(565)	(6,188)
Fair Value, Held-to-maturity	$ 199,361	$ 231,324
Total Percent, Held-to-maturity	29.07%	31.83%
Other Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 880	$ 716
Gross Unrealized Holding Gain, Available-for-sale	0	0
Gross Unrealized Holding Loss, Available-for-sale	0	0
Fair Value, Available-for-sale	$ 880	$ 716
Total Percent, Available-for-sale	0.05%	0.04%

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