Investment Securities (Securities Available for Sale) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,028,428	$ 1,061,461
Gross unrealized gains	19,998	16,164
Gross unrealized losses	(867)	(3,230)
Fair value	1,047,559us-gaap_AvailableForSaleSecurities	1,074,395us-gaap_AvailableForSaleSecurities
US Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	8,013	8,016
Gross unrealized gains	58	3
Gross unrealized losses	0	(3)
Fair value	8,071	8,016
Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	94,719	94,871
Gross unrealized gains	442	268
Gross unrealized losses	(4)	(63)
Fair value	95,157	95,076
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	913,848	944,796
Gross unrealized gains	19,120	15,610
Gross unrealized losses	(855)	(3,149)
Fair value	932,113	957,257
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,934	6,855
Gross unrealized gains	149	147
Gross unrealized losses	0	0
Fair value	6,083	7,002
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,517	6,526
Gross unrealized gains	87	9
Gross unrealized losses	(8)	(15)
Fair value	5,596	6,520
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	397	397
Gross unrealized gains	142	127
Gross unrealized losses	0	0
Fair value	$ 539	$ 524

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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