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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale (Detail) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Net Investment Income [Line Items]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value		$ 61,769
Due after five but within ten years, Amortized Cost		33,580
Due after one but within five years, Amortized Cost		27,333
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	[1]	837,964
Due within one year, Amortized Cost		60,913
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost		0
Due after ten years, Amortized Cost		0
Corporate/Mortgage-Backed Securities, Amortized cost	[1]	831,332
Amortized Cost		898,877	$ 924,054
Due within one year, Estimated Fair Value		0
Due after one but within five years, Estimated Fair Value		27,588
Due after five but within ten years, Estimated Fair Value		34,181
Due after ten years, Estimated Fair Value		0
Securities available for sale, at fair value		893,101	909,247
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		4,620	2,998
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		10,396	17,805
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Net Investment Income [Line Items]
Amortized Cost		660,100
Securities available for sale, at fair value		654,000
Debt Securities [Member]
Net Investment Income [Line Items]
Amortized Cost		898,877
Securities available for sale, at fair value		893,101
Corporate Debt Securities [Member]
Net Investment Income [Line Items]
Securities available for sale, at fair value		23,549	21,012
Obligations of States and Political Subdivisions [Member]
Net Investment Income [Line Items]
Securities available for sale, at fair value		28,214	27,712
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]
Net Investment Income [Line Items]
Securities available for sale, at fair value		10,006	10,012
Residential Mortgage Backed Securities [Member]
Net Investment Income [Line Items]
Securities available for sale, at fair value		653,966	$ 673,361
US Government Agencies Debt Securities [Member]
Net Investment Income [Line Items]
Amortized Cost		177,900
Securities available for sale, at fair value		$ 177,400
[1] Mortgage-Backed Securities include an amortized cost of $177.9 million and a fair value of $177.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $660.1 million and a fair value of $654.0 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.

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