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Accounting for Investments in Qualified Affordable Housing Projects - Summary of Change in Accounting Principle on Statements of Income (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Interest and dividend income | $ 31,176 | $ 30,379 | $ 62,403 | $ 59,774
Interest expense | 3,183 | 3,225 | 6,453 | 7,016
Net interest income | 27,993 | 27,154 | 55,950 | 52,758
Non-interest income | 5,073 | 6,738 | 10,901 | 13,887
Non-interest expense | 18,557 | 18,607 | 36,830 | 36,263
Income before provision for income taxes | 18,375 | 15,285 | 37,187 | 30,382
Provision for income taxes | 6,866 | 5,958 | 14,710 | 10,926
Income from continuing operations | 11,509 | 9,327 | 22,477 | 19,456
Earnings per share from continuing operations |  |  |  |
Basic | $ 0.36 | $ 0.30 | $ 0.71 | $ 0.62
Diluted | $ 0.36 | $ 0.29 | $ 0.70 | $ 0.62
As Previously Reported [Member] |  |  |  |
Interest and dividend income |  | 30,379 |  | 59,774
Interest expense |  | 3,225 |  | 7,016
Net interest income |  | 27,154 |  | 52,758
Non-interest income |  | 6,738 |  | 13,887
Non-interest expense |  | 18,796 |  | 36,640
Income before provision for income taxes |  | 15,096 |  | 30,005
Provision for income taxes |  | 5,737 |  | 10,465
Income from continuing operations |  | 9,359 |  | 19,540
Earnings per share from continuing operations |  |  |  |
Basic |  | $ 0.30 |  | $ 0.62
Diluted |  | $ 0.29 |  | $ 0.62
Effect of Change in Accounting Principle [Member] |  |  |  |
Non-interest expense |  | (189) |  | (377)
Income before provision for income taxes |  | 189 |  | 377
Provision for income taxes |  | 221 |  | 461
Income from continuing operations |  | $ (32) |  | $ (84)

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1, 2 , 3, 4, 5 -Article 9 + Details
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