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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,964,251	$ 2,078,131
Gross Unrealized Holding Gain, Available-for-sale	2,246	13,282
Gross Unrealized Holding Loss, Available-for-sale	(36,503)	(10,428)
Fair Value, Available-for-sale	$ 1,929,994	$ 2,080,985
Total Percent, Available-for-sale	100.00%	100.00%
Amortized Cost, Held-to-maturity	$ 772,469	$ 829,890
Gross Unrealized Holding Gain, Held-to-maturity	980	4,272
Gross Unrealized Holding Loss, Held-to-maturity	(25,860)	(14,947)
Fair Value, Held-to-maturity	$ 747,589	$ 819,215
Total Percent, Held-to-maturity	100.00%	100.00%
CMO/REMIC - Residential [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 244,227	$ 274,634
Gross Unrealized Holding Gain, Available-for-sale	357	1,277
Gross Unrealized Holding Loss, Available-for-sale	(5,073)	(2,082)
Fair Value, Available-for-sale	$ 239,511	$ 273,829
Total Percent, Available-for-sale	12.41%	13.16%
Amortized Cost, Held-to-maturity	$ 219,159	$ 225,072
Gross Unrealized Holding Gain, Held-to-maturity	0	0
Gross Unrealized Holding Loss, Held-to-maturity	(12,773)	(8,641)
Fair Value, Held-to-maturity	$ 206,386	$ 216,431
Total Percent, Held-to-maturity	28.37%	27.12%
Government Agency/GSE [Member]
Schedule of Investments [Line Items]
Amortized Cost, Held-to-maturity	$ 149,693	$ 159,716
Gross Unrealized Holding Gain, Held-to-maturity	406	854
Gross Unrealized Holding Loss, Held-to-maturity	(2,948)	(2,134)
Fair Value, Held-to-maturity	$ 147,151	$ 158,436
Total Percent, Held-to-maturity	19.38%	19.25%
Residential Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,665,717	$ 1,747,780
Gross Unrealized Holding Gain, Available-for-sale	1,489	11,231
Gross Unrealized Holding Loss, Available-for-sale	(30,322)	(8,102)
Fair Value, Available-for-sale	$ 1,636,884	$ 1,750,909
Total Percent, Available-for-sale	84.81%	84.14%
Amortized Cost, Held-to-maturity	$ 164,914	$ 176,427
Gross Unrealized Holding Gain, Held-to-maturity	0	667
Gross Unrealized Holding Loss, Held-to-maturity	(4,020)	(382)
Fair Value, Held-to-maturity	$ 160,894	$ 176,712
Total Percent, Held-to-maturity	21.35%	21.26%
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 53,557	$ 54,966
Gross Unrealized Holding Gain, Available-for-sale	400	774
Gross Unrealized Holding Loss, Available-for-sale	(1,108)	(244)
Fair Value, Available-for-sale	$ 52,849	$ 55,496
Total Percent, Available-for-sale	2.74%	2.66%
Amortized Cost, Held-to-maturity	$ 238,703	$ 268,675
Gross Unrealized Holding Gain, Held-to-maturity	574	2,751
Gross Unrealized Holding Loss, Held-to-maturity	(6,119)	(3,790)
Fair Value, Held-to-maturity	$ 233,158	$ 267,636
Total Percent, Held-to-maturity	30.90%	32.37%
Other Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 750	$ 751
Gross Unrealized Holding Gain, Available-for-sale	0	0
Gross Unrealized Holding Loss, Available-for-sale	0	0
Fair Value, Available-for-sale	$ 750	$ 751
Total Percent, Available-for-sale	0.04%	0.04%

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