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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Interest and dividend income | $ 34,149 | $ 31,627 | $ 96,552 | $ 91,401
Interest expense | 3,475 | 3,153 | 9,929 | 10,169
Net interest income | 30,674 | 28,474 | 86,623 | 81,232
Noninterest income | 14,321 | 6,059 | 25,237 | 19,945
Noninterest expense | 26,763 | 17,636 | 63,595 | 53,898
Income before provision for income taxes | 18,232 | 16,897 | 55,431 | 47,279
Provision for income taxes | 4,968 | 6,582 | 19,667 | 17,510
Income from continuing operations | 13,264 | 10,315 | 35,764 | 29,769
Earnings per share from continuing operations |  |  |  |
Basic | $ 0.42 | $ 0.33 | $ 1.13 | $ 0.94
Diluted | $ 0.41 | $ 0.33 | $ 1.12 | $ 0.94
As Previously Reported [Member] |  |  |  |
Interest and dividend income |  | 31,627 |  | 91,401
Interest expense |  | 3,153 |  | 10,169
Net interest income |  | 28,474 |  | 81,232
Noninterest income |  | 6,059 |  | 19,945
Noninterest expense |  | 17,811 |  | 54,451
Income before provision for income taxes |  | 16,722 |  | 46,726
Provision for income taxes |  | 6,542 |  | 17,008
Income from continuing operations |  | 10,180 |  | 29,718
Earnings per share from continuing operations |  |  |  |
Basic |  | $ 0.32 |  | $ 0.94
Diluted |  | $ 0.32 |  | $ 0.94
Effect of Change in Accounting Principle [Member] |  |  |  |
Noninterest expense |  | (175) |  | (553)
Income before provision for income taxes |  | 175 |  | 553
Provision for income taxes |  | 40 |  | 502
Income from continuing operations |  | $ 135 |  | $ 51
Earnings per share from continuing operations |  |  |  |
Basic |  | $ 0.01 |  |
Diluted |  | $ 0.01 |  |

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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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