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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,549,406	$ 1,757,666
Gross Unrealized Holding Gain, Available-for-sale	22,678	2,033
Gross Unrealized Holding Loss, Available-for-sale	(1,678)	(25,614)
Fair Value, Available-for-sale	$ 1,570,406	$ 1,734,085
Total Percent, Available-for-sale	100.00%	100.00%
Amortized Cost, Held-to-maturity	$ 703,953	$ 744,440
Gross Unrealized Holding Gain, Held-to-maturity	10,136	1,128
Gross Unrealized Holding Loss, Held-to-maturity	(2,198)	(24,031)
Fair Value, Held-to-maturity	$ 711,891	$ 721,537
Total Percent, Held-to-maturity	100.00%	100.00%
CMO/REMIC - Residential [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 381,615	$ 217,223
Gross Unrealized Holding Gain, Available-for-sale	1,649	353
Gross Unrealized Holding Loss, Available-for-sale	(336)	(3,525)
Fair Value, Available-for-sale	$ 382,928	$ 214,051
Total Percent, Available-for-sale	24.38%	12.34%
Amortized Cost, Held-to-maturity	$ 204,263	$ 215,336
Gross Unrealized Holding Gain, Held-to-maturity	76	0
Gross Unrealized Holding Loss, Held-to-maturity	(1,467)	(12,081)
Fair Value, Held-to-maturity	$ 202,872	$ 203,255
Total Percent, Held-to-maturity	29.02%	28.93%
Government Agency/GSE [Member]
Schedule of Investments [Line Items]
Amortized Cost, Held-to-maturity	$ 123,917	$ 138,274
Gross Unrealized Holding Gain, Held-to-maturity	3,238	572
Gross Unrealized Holding Loss, Held-to-maturity	(170)	(2,622)
Fair Value, Held-to-maturity	$ 126,985	$ 136,224
Total Percent, Held-to-maturity	17.60%	18.57%
Residential Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,127,395	$ 1,494,106
Gross Unrealized Holding Gain, Available-for-sale	20,105	1,348
Gross Unrealized Holding Loss, Available-for-sale	(1,341)	(20,946)
Fair Value, Available-for-sale	$ 1,146,159	$ 1,474,508
Total Percent, Available-for-sale	72.99%	85.03%
Amortized Cost, Held-to-maturity	$ 172,919	$ 153,874
Gross Unrealized Holding Gain, Held-to-maturity	2,624	0
Gross Unrealized Holding Loss, Held-to-maturity	(3)	(3,140)
Fair Value, Held-to-maturity	$ 175,540	$ 150,734
Total Percent, Held-to-maturity	24.56%	20.67%
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 39,564	$ 45,621
Gross Unrealized Holding Gain, Available-for-sale	924	332
Gross Unrealized Holding Loss, Available-for-sale	(1)	(1,143)
Fair Value, Available-for-sale	$ 40,487	$ 44,810
Total Percent, Available-for-sale	2.58%	2.59%
Amortized Cost, Held-to-maturity	$ 202,854	$ 236,956
Gross Unrealized Holding Gain, Held-to-maturity	4,198	556
Gross Unrealized Holding Loss, Held-to-maturity	(558)	(6,188)
Fair Value, Held-to-maturity	$ 206,494	$ 231,324
Total Percent, Held-to-maturity	28.82%	31.83%
Other Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 832	$ 716
Gross Unrealized Holding Gain, Available-for-sale	0	0
Gross Unrealized Holding Loss, Available-for-sale	0	0
Fair Value, Available-for-sale	$ 832	$ 716
Total Percent, Available-for-sale	0.05%	0.04%

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