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Investment Securities (Securities Available for Sale) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,025,030	$ 1,041,247
Gross unrealized gains	8,225	7,558
Gross unrealized losses	(4,950)	(8,419)
Fair value	1,028,305	1,040,386
U.S. Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,995	7,995
Gross unrealized gains	0	13
Gross unrealized losses	(1)	0
Fair value	5,994	8,008
Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	28,031	57,123
Gross unrealized gains	15	90
Gross unrealized losses	(11)	(25)
Fair value	28,035	57,188
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	965,863	952,992
Gross unrealized gains	7,477	7,249
Gross unrealized losses	(4,928)	(8,380)
Fair value	968,412	951,861
State And Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	3,695	3,727
Gross unrealized gains	112	19
Gross unrealized losses	0	(3)
Fair value	3,807	3,743
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	21,049	19,013
Gross unrealized gains	420	35
Gross unrealized losses	(10)	(11)
Fair value	21,459	19,037
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	397	397
Gross unrealized gains	201	152
Gross unrealized losses	0	0
Fair value	$ 598	$ 549

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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+ References

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