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Investment Securities (Disclosure Regarding Length of Time on Securities Available for Sale with Temporary Impairment) (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | $ 446,629 | $ 568,290
Less than 12 months, gross unrealized losses | (3,968) | (8,405)
12 months or longer, fair value | 51,872 | 1,055
12 months or longer, gross unrealized losses | (982) | (14)
Total, fair value | 498,501 | 569,345
Total, gross unrealized losses | (4,950) | (8,419)
U.S. Treasury Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 5,994 |
Less than 12 months, gross unrealized losses | (1) |
12 months or longer, fair value | 0 |
12 months or longer, gross unrealized losses | 0 |
Total, fair value | 5,994 |
Total, gross unrealized losses | (1) | 0
Agency Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 16,008 | 14,000
Less than 12 months, gross unrealized losses | (11) | (25)
12 months or longer, fair value | 0 | 0
12 months or longer, gross unrealized losses | 0 | 0
Total, fair value | 16,008 | 14,000
Total, gross unrealized losses | (11) | (25)
Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 424,627 | 553,629
Less than 12 months, gross unrealized losses | (3,956) | (8,377)
12 months or longer, fair value | 50,881 | 65
12 months or longer, gross unrealized losses | (972) | (3)
Total, fair value | 475,508 | 553,694
Total, gross unrealized losses | (4,928) | (8,380)
State and municipal obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value |  | 661
Less than 12 months, gross unrealized losses |  | (3)
12 months or longer, fair value |  | 0
12 months or longer, gross unrealized losses |  | 0
Total, fair value |  | 661
Total, gross unrealized losses |  | (3)
Corporate Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 0 | 0
Less than 12 months, gross unrealized losses | 0 | 0
12 months or longer, fair value | 991 | 990
12 months or longer, gross unrealized losses | (10) | (11)
Total, fair value | 991 | 990
Total, gross unrealized losses | $ (10) | $ (11)

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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