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Subsequent Events - Additional Information (Detail) $ / shares in Units, $ in Thousands | Jul. 23, 2019 USD ($) Branch $ / shares shares | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
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Subsequent Event [Line Items] |  |  |  |  |  |  |
Total Assets |  | $ 12,494,653 |  | $ 12,458,632 |  |  |
Portfolio loans, net of unearned income |  | 7,737,854 |  | 7,656,281 |  |  |
Deposits |  | 8,694,928 |  | 8,831,633 |  |  |
Total shareholders' equity |  | $ 2,074,116 | $ 2,023,139 | $ 1,978,827 | $ 1,524,106 | $ 1,403,026 | $ 1,395,321
Subsequent Event [Member] | Old Line [Member] | Definitive Agreement and Plan of Merger [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Total Assets | $ 3,100,000 |  |  |  |  |  |
Portfolio loans, net of unearned income | 2,400,000 |  |  |  |  |  |
Deposits | 2,400,000 |  |  |  |  |  |
Total shareholders' equity | $ 400,000 |  |  |  |  |  |
Number of branches acquired | Branch | 37 |  |  |  |  |  |
Value of acquisition | $ 500,100 |  |  |  |  |  |
Number of shares issued for acquisition | shares | 0.7844 |  |  |  |  |  |
Business acquisition, price per share | $ / shares | $ 29.22 |  |  |  |  |  |

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 + Details
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