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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,584,687	$ 1,757,666
Gross Unrealized Holding Gain, Available-for-sale	18,125	2,033
Gross Unrealized Holding Loss, Available-for-sale	(2,792)	(25,614)
Fair Value, Available-for-sale	$ 1,600,020	$ 1,734,085
Total Percent, Available-for-sale	100.00%	100.00%
Amortized Cost, Held-to-maturity	$ 728,113	$ 744,440
Gross Unrealized Holding Gain, Held-to-maturity	7,357	1,128
Gross Unrealized Holding Loss, Held-to-maturity	(6,438)	(24,031)
Fair Value, Held-to-maturity	$ 729,032	$ 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	$ 194,094	$ 217,223
Gross Unrealized Holding Gain, Available-for-sale	1,216	353
Gross Unrealized Holding Loss, Available-for-sale	(334)	(3,525)
Fair Value, Available-for-sale	$ 194,976	$ 214,051
Total Percent, Available-for-sale	12.19%	12.34%
Amortized Cost, Held-to-maturity	$ 211,436	$ 215,336
Gross Unrealized Holding Gain, Held-to-maturity	5	0
Gross Unrealized Holding Loss, Held-to-maturity	(4,358)	(12,081)
Fair Value, Held-to-maturity	$ 207,083	$ 203,255
Total Percent, Held-to-maturity	29.04%	28.93%
Government Agency/GSE [Member]
Schedule of Investments [Line Items]
Amortized Cost, Held-to-maturity	$ 128,721	$ 138,274
Gross Unrealized Holding Gain, Held-to-maturity	2,627	572
Gross Unrealized Holding Loss, Held-to-maturity	(414)	(2,622)
Fair Value, Held-to-maturity	$ 130,934	$ 136,224
Total Percent, Held-to-maturity	17.68%	18.57%
Residential Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,348,415	$ 1,494,106
Gross Unrealized Holding Gain, Available-for-sale	16,251	1,348
Gross Unrealized Holding Loss, Available-for-sale	(2,417)	(20,946)
Fair Value, Available-for-sale	$ 1,362,249	$ 1,474,508
Total Percent, Available-for-sale	85.14%	85.03%
Amortized Cost, Held-to-maturity	$ 175,552	$ 153,874
Gross Unrealized Holding Gain, Held-to-maturity	1,480	0
Gross Unrealized Holding Loss, Held-to-maturity	(415)	(3,140)
Fair Value, Held-to-maturity	$ 176,617	$ 150,734
Total Percent, Held-to-maturity	24.11%	20.67%
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 41,369	$ 45,621
Gross Unrealized Holding Gain, Available-for-sale	658	332
Gross Unrealized Holding Loss, Available-for-sale	(41)	(1,143)
Fair Value, Available-for-sale	$ 41,986	$ 44,810
Total Percent, Available-for-sale	2.62%	2.59%
Amortized Cost, Held-to-maturity	$ 212,404	$ 236,956
Gross Unrealized Holding Gain, Held-to-maturity	3,245	556
Gross Unrealized Holding Loss, Held-to-maturity	(1,251)	(6,188)
Fair Value, Held-to-maturity	$ 214,398	$ 231,324
Total Percent, Held-to-maturity	29.17%	31.83%
Other Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 809	$ 716
Gross Unrealized Holding Gain, Available-for-sale	0	0
Gross Unrealized Holding Loss, Available-for-sale	0	0
Fair Value, Available-for-sale	$ 809	$ 716
Total Percent, Available-for-sale	0.05%	0.04%

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