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Accounting for Investments in Qualified Affordable Housing Projects - Summary of Change in Accounting Principle on Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2013 As Previously Reported [Member] | Dec. 31, 2013 As Previously Reported [Member] | Sep. 30, 2013 Effect of Change in Accounting Principle [Member]
Cash flows from operating activities: |  |  |  |  |  |  |
Net income | $ 13,264 | $ 10,385 | $ 35,320 | $ 29,930 | $ 29,879 |  | $ 51
Total adjustment in net income |  |  |  | 18,047 | 18,098 |  | (51)
Net cash provided by operating activities |  |  | 24,705 | 47,977 | 47,977 |  |
Cash flows from investing activities: |  |  |  |  |  |  |
Net cash used in investing activities |  |  | 37,704 | (71,768) | (71,768) |  |
Cash flows from financing activities: |  |  |  |  |  |  |
Net cash used in financing activities |  |  | (44,750) | (50,402) | (50,402) |  |
Net decrease in cash and cash equivalents |  |  | 17,659 | (74,193) | (74,193) |  |
Cash and cash equivalents at beginning of year |  |  | 179,357 | 268,047 | 268,047 | 179,357 |
Cash and cash equivalents at end of period | $ 197,016 | $ 193,854 | $ 197,016 | $ 193,854 | $ 193,854 | $ 179,357 |

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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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