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Investment Securities (Disclosure Regarding Length of Time on Securities Available for Sale with Temporary Impairment) (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | $ 570,958 | $ 568,290
Less than 12 months, gross unrealized losses | (7,119) | (8,405)
12 months or longer, fair value | 1,055 | 1,055
12 months or longer, gross unrealized losses | (14) | (14)
Total, fair value | 572,013 | 569,345
Total, gross unrealized losses | (7,133) | (8,419)
Agency Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 23,046 | 14,000
Less than 12 months, gross unrealized losses | (27) | (25)
12 months or longer, fair value | 0 | 0
12 months or longer, gross unrealized losses | 0 | 0
Total, fair value | 23,046 | 14,000
Total, gross unrealized losses | (27) | (25)
Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 547,912 | 553,629
Less than 12 months, gross unrealized losses | (7,092) | (8,377)
12 months or longer, fair value | 65 | 65
12 months or longer, gross unrealized losses | (3) | (3)
Total, fair value | 547,977 | 553,694
Total, gross unrealized losses | (7,095) | (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 | 0 | (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 | 990 | 990
12 months or longer, gross unrealized losses | (11) | (11)
Total, fair value | 990 | 990
Total, gross unrealized losses | $ (11) | $ (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=73527792&loc=d3e27161-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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