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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,677,732	$ 1,757,666
Gross Unrealized Holding Gain, Available-for-sale	6,998	2,033
Gross Unrealized Holding Loss, Available-for-sale	(11,229)	(25,614)
Fair Value, Available-for-sale	$ 1,673,501	$ 1,734,085
Total Percent, Available-for-sale	100.00%	100.00%
Amortized Cost, Held-to-maturity	$ 733,464	$ 744,440
Gross Unrealized Holding Gain, Held-to-maturity	3,120	1,128
Gross Unrealized Holding Loss, Held-to-maturity	(15,933)	(24,031)
Fair Value, Held-to-maturity	$ 720,651	$ 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	$ 206,956	$ 217,223
Gross Unrealized Holding Gain, Available-for-sale	470	353
Gross Unrealized Holding Loss, Available-for-sale	(2,301)	(3,525)
Fair Value, Available-for-sale	$ 205,125	$ 214,051
Total Percent, Available-for-sale	12.26%	12.34%
Amortized Cost, Held-to-maturity	$ 213,145	$ 215,336
Gross Unrealized Holding Gain, Held-to-maturity	0	0
Gross Unrealized Holding Loss, Held-to-maturity	(9,998)	(12,081)
Fair Value, Held-to-maturity	$ 203,147	$ 203,255
Total Percent, Held-to-maturity	29.06%	28.93%
Government Agency/GSE [Member]
Schedule of Investments [Line Items]
Amortized Cost, Held-to-maturity	$ 133,557	$ 138,274
Gross Unrealized Holding Gain, Held-to-maturity	564	572
Gross Unrealized Holding Loss, Held-to-maturity	(2,077)	(2,622)
Fair Value, Held-to-maturity	$ 132,044	$ 136,224
Total Percent, Held-to-maturity	18.21%	18.57%
Residential Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,424,937	$ 1,494,106
Gross Unrealized Holding Gain, Available-for-sale	6,107	1,348
Gross Unrealized Holding Loss, Available-for-sale	(8,540)	(20,946)
Fair Value, Available-for-sale	$ 1,422,504	$ 1,474,508
Total Percent, Available-for-sale	85.00%	85.03%
Amortized Cost, Held-to-maturity	$ 169,367	$ 153,874
Gross Unrealized Holding Gain, Held-to-maturity	737	0
Gross Unrealized Holding Loss, Held-to-maturity	(999)	(3,140)
Fair Value, Held-to-maturity	$ 169,105	$ 150,734
Total Percent, Held-to-maturity	23.09%	20.67%
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 45,052	$ 45,621
Gross Unrealized Holding Gain, Available-for-sale	421	332
Gross Unrealized Holding Loss, Available-for-sale	(388)	(1,143)
Fair Value, Available-for-sale	$ 45,085	$ 44,810
Total Percent, Available-for-sale	2.69%	2.59%
Amortized Cost, Held-to-maturity	$ 217,395	$ 236,956
Gross Unrealized Holding Gain, Held-to-maturity	1,819	556
Gross Unrealized Holding Loss, Held-to-maturity	(2,859)	(6,188)
Fair Value, Held-to-maturity	$ 216,355	$ 231,324
Total Percent, Held-to-maturity	29.64%	31.83%
Other Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 787	$ 716
Gross Unrealized Holding Gain, Available-for-sale	0	0
Gross Unrealized Holding Loss, Available-for-sale	0	0
Fair Value, Available-for-sale	$ 787	$ 716
Total Percent, Available-for-sale	0.05%	0.04%

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