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Loans - Loans by Class Modified as Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended
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Mar. 31, 2014 Loans | Dec. 31, 2013 Loans | Mar. 31, 2013 Trouble Debt Restructuring [Member] Loans | Mar. 31, 2014 Commercial, Industrial, and Agricultural [Member] Loans | Dec. 31, 2013 Commercial, Industrial, and Agricultural [Member] Loans | Mar. 31, 2013 Commercial, Industrial, and Agricultural [Member] Trouble Debt Restructuring [Member] Loans | Mar. 31, 2014 Commercial Mortgages [Member] Loans | Dec. 31, 2013 Commercial Mortgages [Member] Loans | Mar. 31, 2013 Commercial Mortgages [Member] Trouble Debt Restructuring [Member] Loans | Mar. 31, 2014 Residential Real Estate [Member] Loans | Dec. 31, 2013 Residential Real Estate [Member] Loans | Mar. 31, 2013 Residential Real Estate [Member] Trouble Debt Restructuring [Member] Loans | Mar. 31, 2014 Consumer [Member] Loans | Dec. 31, 2013 Consumer [Member] Loans | Mar. 31, 2013 Consumer [Member] Trouble Debt Restructuring [Member] Loans | Mar. 31, 2014 Credit Cards [Member] Loans | Dec. 31, 2013 Credit Cards [Member] Loans | Mar. 31, 2013 Credit Cards [Member] Trouble Debt Restructuring [Member] Loans
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Loans | 12 | 12 | 1 | 5 | 5 | 0 | 7 | 7 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Pre-Modification Outstanding Recorded Investment |  |  | $ 346 |  |  | $ 0 |  |  | $ 346 |  |  | $ 0 |  |  | $ 0 |  |  | $ 0
Post-Modification Outstanding Recorded Investment |  |  | $ 403 |  |  | $ 0 |  |  | $ 403 |  |  | $ 0 |  |  | $ 0 |  |  | $ 0

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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